Added boost header

test/external/boost/signals2/detail/foreign_ptr.hpp

@@ -0,0 +1,182 @@
+
+//  helper code for dealing with tracking non-boost shared_ptr/weak_ptr
+
+// Copyright Frank Mori Hess 2009.
+// Distributed under the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/signals2 for library home page.
+
+#ifndef BOOST_SIGNALS2_FOREIGN_PTR_HPP
+#define BOOST_SIGNALS2_FOREIGN_PTR_HPP
+
+#include <algorithm>
+#include <boost/assert.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/smart_ptr/bad_weak_ptr.hpp>
+#include <boost/utility/swap.hpp>
+
+namespace std
+{
+  template<typename T> class shared_ptr;
+  template<typename T> class weak_ptr;
+}
+
+namespace boost
+{
+  template<typename T> class shared_ptr;
+  template<typename T> class weak_ptr;
+
+  namespace signals2
+  {
+    template<typename WeakPtr> struct weak_ptr_traits
+    {};
+    template<typename T> struct weak_ptr_traits<boost::weak_ptr<T> >
+    {
+      typedef boost::shared_ptr<T> shared_type;
+    };
+    template<typename T> struct weak_ptr_traits<std::weak_ptr<T> >
+    {
+      typedef std::shared_ptr<T> shared_type;
+    };
+
+    template<typename SharedPtr> struct shared_ptr_traits
+    {};
+
+    template<typename T> struct shared_ptr_traits<boost::shared_ptr<T> >
+    {
+      typedef boost::weak_ptr<T> weak_type;
+    };
+    template<typename T> struct shared_ptr_traits<std::shared_ptr<T> >
+    {
+      typedef std::weak_ptr<T> weak_type;
+    };
+
+    namespace detail
+    {
+      struct foreign_shared_ptr_impl_base
+      {
+        virtual ~foreign_shared_ptr_impl_base() {}
+        virtual void* get() const = 0;
+        virtual foreign_shared_ptr_impl_base * clone() const = 0;
+      };
+
+      template<typename FSP>
+      class foreign_shared_ptr_impl: public foreign_shared_ptr_impl_base
+      {
+      public:
+        foreign_shared_ptr_impl(const FSP &p): _p(p)
+        {}
+        virtual void * get() const
+        {
+          return _p.get();
+        }
+        virtual foreign_shared_ptr_impl * clone() const
+        {
+          return new foreign_shared_ptr_impl(*this);
+        }
+      private:
+        FSP _p;
+      };
+
+      class foreign_void_shared_ptr
+      {
+      public:
+        foreign_void_shared_ptr():
+          _p(0)
+        {}
+        foreign_void_shared_ptr(const foreign_void_shared_ptr &other):
+          _p(other._p->clone())
+        {}
+        template<typename FSP>
+        explicit foreign_void_shared_ptr(const FSP &fsp):
+          _p(new foreign_shared_ptr_impl<FSP>(fsp))
+        {}
+        ~foreign_void_shared_ptr()
+        {
+          delete _p;
+        }
+        foreign_void_shared_ptr & operator=(const foreign_void_shared_ptr &other)
+        {
+          if(&other == this) return *this;
+          foreign_void_shared_ptr(other).swap(*this);
+          return *this;
+        }
+        void swap(foreign_void_shared_ptr &other)
+        {
+          boost::swap(_p, other._p);
+        }
+      private:
+        foreign_shared_ptr_impl_base *_p;
+      };
+
+      struct foreign_weak_ptr_impl_base
+      {
+        virtual ~foreign_weak_ptr_impl_base() {}
+        virtual foreign_void_shared_ptr lock() const = 0;
+        virtual bool expired() const = 0;
+        virtual foreign_weak_ptr_impl_base * clone() const = 0;
+      };
+
+      template<typename FWP>
+      class foreign_weak_ptr_impl: public foreign_weak_ptr_impl_base
+      {
+      public:
+        foreign_weak_ptr_impl(const FWP &p): _p(p)
+        {}
+        virtual foreign_void_shared_ptr lock() const
+        {
+          return foreign_void_shared_ptr(_p.lock());
+        }
+        virtual bool expired() const
+        {
+          return _p.expired();
+        }
+        virtual foreign_weak_ptr_impl * clone() const
+        {
+          return new foreign_weak_ptr_impl(*this);
+        }
+      private:
+        FWP _p;
+      };
+
+      class foreign_void_weak_ptr
+      {
+      public:
+        foreign_void_weak_ptr()
+        {}
+        foreign_void_weak_ptr(const foreign_void_weak_ptr &other):
+          _p(other._p->clone())
+        {}
+        template<typename FWP>
+        explicit foreign_void_weak_ptr(const FWP &fwp):
+          _p(new foreign_weak_ptr_impl<FWP>(fwp))
+        {}
+        foreign_void_weak_ptr & operator=(const foreign_void_weak_ptr &other)
+        {
+          if(&other == this) return *this;
+          foreign_void_weak_ptr(other).swap(*this);
+          return *this;
+        }
+        void swap(foreign_void_weak_ptr &other)
+        {
+          boost::swap(_p, other._p);
+        }
+        foreign_void_shared_ptr lock() const
+        {
+          return _p->lock();
+        }
+        bool expired() const
+        {
+          return _p->expired();
+        }
+      private:
+        boost::scoped_ptr<foreign_weak_ptr_impl_base> _p;
+      };
+    } // namespace detail
+
+  } // namespace signals2
+} // namespace boost
+
+#endif  // BOOST_SIGNALS2_FOREIGN_PTR_HPP

test/external/boost/signals2/detail/lwm_nop.hpp

@@ -0,0 +1,38 @@
+//
+//  boost/signals2/detail/lwm_nop.hpp
+//
+//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
+//  Copyright (c) 2008 Frank Mori Hess
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_SIGNALS2_LWM_NOP_HPP
+#define BOOST_SIGNALS2_LWM_NOP_HPP
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+
+#include <boost/signals2/dummy_mutex.hpp>
+
+namespace boost
+{
+
+namespace signals2
+{
+
+class mutex: public dummy_mutex
+{
+};
+
+} // namespace signals2
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SIGNALS2_LWM_NOP_HPP

test/external/boost/signals2/detail/lwm_pthreads.hpp

@@ -0,0 +1,78 @@
+//
+//  boost/signals2/detail/lwm_pthreads.hpp
+//
+//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
+//  Copyright (c) 2008 Frank Mori Hess
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_SIGNALS2_LWM_PTHREADS_HPP
+#define BOOST_SIGNALS2_LWM_PTHREADS_HPP
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+
+#include <pthread.h>
+
+namespace boost
+{
+
+namespace signals2
+{
+
+class mutex
+{
+private:
+
+    pthread_mutex_t m_;
+
+    mutex(mutex const &);
+    mutex & operator=(mutex const &);
+
+public:
+
+    mutex()
+    {
+
+// HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
+
+#if defined(__hpux) && defined(_DECTHREADS_)
+        pthread_mutex_init(&m_, pthread_mutexattr_default);
+#else
+        pthread_mutex_init(&m_, 0);
+#endif
+    }
+
+    ~mutex()
+    {
+        pthread_mutex_destroy(&m_);
+    }
+
+    void lock()
+    {
+        pthread_mutex_lock(&m_);
+    }
+
+    bool try_lock()
+    {
+        return pthread_mutex_trylock(&m_) == 0;
+    }
+
+    void unlock()
+    {
+        pthread_mutex_unlock(&m_);
+    }
+};
+
+} // namespace signals2
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SIGNALS2_LWM_PTHREADS_HPP

test/external/boost/signals2/detail/lwm_win32_cs.hpp

@@ -0,0 +1,109 @@
+//
+//  boost/signals2/detail/lwm_win32_cs.hpp
+//
+//  Copyright (c) 2002, 2003 Peter Dimov
+//  Copyright (c) 2008 Frank Mori Hess
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP
+#define BOOST_SIGNALS2_LWM_WIN32_CS_HPP
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/assert.hpp>
+
+#ifdef BOOST_USE_WINDOWS_H
+#  include <windows.h>
+#endif
+
+namespace boost
+{
+
+namespace signals2
+{
+
+#ifndef BOOST_USE_WINDOWS_H
+
+struct critical_section
+{
+    struct critical_section_debug * DebugInfo;
+    long LockCount;
+    long RecursionCount;
+    void * OwningThread;
+    void * LockSemaphore;
+#if defined(_WIN64)
+    unsigned __int64 SpinCount;
+#else
+    unsigned long SpinCount;
+#endif
+};
+
+extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) bool __stdcall TryEnterCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
+
+#else
+
+typedef ::CRITICAL_SECTION critical_section;
+
+#endif // #ifndef BOOST_USE_WINDOWS_H
+
+class mutex
+{
+private:
+
+    critical_section cs_;
+
+    mutex(mutex const &);
+    mutex & operator=(mutex const &);
+
+public:
+
+    mutex()
+    {
+        InitializeCriticalSection(&cs_);
+    }
+
+    ~mutex()
+    {
+        DeleteCriticalSection(&cs_);
+    }
+
+    void lock()
+    {
+        EnterCriticalSection(&cs_);
+    }
+// TryEnterCriticalSection only exists on Windows NT 4.0 and later
+#if (defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400))
+    bool try_lock()
+    {
+        return TryEnterCriticalSection(&cs_) != 0;
+    }
+#else
+    bool try_lock()
+    {
+        BOOST_ASSERT(false);
+        return false;
+    }
+#endif
+    void unlock()
+    {
+        LeaveCriticalSection(&cs_);
+    }
+};
+
+} // namespace signals2
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP

test/external/boost/signals2/detail/null_output_iterator.hpp

@@ -0,0 +1,34 @@
+/*
+  An output iterator which simply discards output.
+*/
+// Copyright Frank Mori Hess 2008.
+// Distributed under the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/signals2 for library home page.
+
+#ifndef BOOST_SIGNALS2_NULL_OUTPUT_ITERATOR_HPP
+#define BOOST_SIGNALS2_NULL_OUTPUT_ITERATOR_HPP
+
+#include <boost/function_output_iterator.hpp>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      class does_nothing
+      {
+      public:
+        template<typename T>
+          void operator()(const T&) const
+          {}
+      };
+      typedef boost::function_output_iterator<does_nothing> null_output_iterator;
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#endif  // BOOST_SIGNALS2_NULL_OUTPUT_ITERATOR_HPP

test/external/boost/signals2/detail/preprocessed_arg_type.hpp

@@ -0,0 +1,34 @@
+// Boost.Signals2 library
+
+// Copyright Frank Mori Hess 2007-2009.
+// Copyright Timmo Stange 2007.
+// Copyright Douglas Gregor 2001-2004. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_PREPROCESSED_ARG_TYPE_HPP
+#define BOOST_SIGNALS2_PREPROCESSED_ARG_TYPE_HPP
+
+#include <boost/preprocessor/repetition.hpp>
+#include <boost/signals2/detail/signals_common_macros.hpp>
+
+#define BOOST_PP_ITERATION_LIMITS (0, BOOST_PP_INC(BOOST_SIGNALS2_MAX_ARGS))
+#define BOOST_PP_FILENAME_1 <boost/signals2/detail/preprocessed_arg_type_template.hpp>
+#include BOOST_PP_ITERATE()
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      struct std_functional_base
+      {};
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#endif // BOOST_SIGNALS2_PREPROCESSED_ARG_TYPE_HPP

test/external/boost/signals2/detail/preprocessed_arg_type_template.hpp

@@ -0,0 +1,39 @@
+// Copyright Frank Mori Hess 2009
+//
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+// This file is included iteratively, and should not be protected from multiple inclusion
+
+#define BOOST_SIGNALS2_NUM_ARGS BOOST_PP_ITERATION()
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<unsigned n BOOST_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+        BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+        class BOOST_SIGNALS2_PREPROCESSED_ARG_N_TYPE_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+// template<typename T1, typename T2, ... , typename TN> class preprocessed_arg_typeN<n, T1, T2, ..., TN>{...} ...
+#define BOOST_SIGNALS2_PREPROCESSED_ARG_TYPE_CLASS_TEMPLATE_SPECIALIZATION(z, n, data) \
+  template<BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)> \
+  class BOOST_SIGNALS2_PREPROCESSED_ARG_N_TYPE_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)<n, \
+    BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS)> \
+  { \
+  public: \
+    typedef BOOST_PP_CAT(T, BOOST_PP_INC(n)) type; \
+  };
+      BOOST_PP_REPEAT(BOOST_SIGNALS2_NUM_ARGS, BOOST_SIGNALS2_PREPROCESSED_ARG_TYPE_CLASS_TEMPLATE_SPECIALIZATION, ~)
+
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#undef BOOST_SIGNALS2_NUM_ARGS

test/external/boost/signals2/detail/replace_slot_function.hpp

@@ -0,0 +1,32 @@
+// Copyright Frank Mori Hess 2007-2009
+//
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_DETAIL_REPLACE_SLOT_FUNCTION_HPP
+#define BOOST_SIGNALS2_DETAIL_REPLACE_SLOT_FUNCTION_HPP
+
+#include <boost/signals2/slot_base.hpp>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<typename ResultSlot, typename SlotIn, typename SlotFunction>
+        ResultSlot replace_slot_function(const SlotIn &slot_in, const SlotFunction &fun)
+      {
+        ResultSlot slot(fun);
+        slot.track(slot_in);
+        return slot;
+      }
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#endif // BOOST_SIGNALS2_DETAIL_REPLACE_SLOT_FUNCTION_HPP

test/external/boost/signals2/detail/result_type_wrapper.hpp

@@ -0,0 +1,72 @@
+// Boost.Signals2 library
+
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2007. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP
+#define BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP
+
+#include <boost/config.hpp>
+
+namespace boost {
+  namespace signals2 {
+    namespace detail {
+      // A placeholder for void on compilers that don't support void returns
+      struct void_type {};
+
+      // Replaces void with void_type
+      template<typename R>
+      struct nonvoid {
+        typedef R type;
+      };
+      template<>
+      struct nonvoid<void> {
+        typedef void_type type;
+      };
+
+      // Replaces void with void_type only if compiler doesn't support void returns
+      template<typename R>
+      struct result_type_wrapper {
+        typedef R type;
+      };
+#ifdef BOOST_NO_VOID_RETURNS
+      template<>
+      struct result_type_wrapper<void> {
+        typedef void_type type;
+      };
+#endif
+
+      // specialization deals with possible void return from combiners
+      template<typename R> class combiner_invoker
+      {
+      public:
+        typedef R result_type;
+        template<typename Combiner, typename InputIterator>
+          result_type operator()(Combiner &combiner,
+          InputIterator first, InputIterator last) const
+        {
+          return combiner(first, last);
+        }
+      };
+      template<> class combiner_invoker<void>
+      {
+      public:
+        typedef result_type_wrapper<void>::type result_type;
+        template<typename Combiner, typename InputIterator>
+          result_type operator()(Combiner &combiner,
+          InputIterator first, InputIterator last) const
+        {
+          combiner(first, last);
+          return result_type();
+        }
+      };
+    } // end namespace detail
+  } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP

test/external/boost/signals2/detail/signal_template.hpp

@@ -0,0 +1,820 @@
+/*
+  Template for Signa1, Signal2, ... classes that support signals
+  with 1, 2, ... parameters
+
+  Begin: 2007-01-23
+*/
+// Copyright Frank Mori Hess 2007-2008
+//
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// This file is included iteratively, and should not be protected from multiple inclusion
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+#define BOOST_SIGNALS2_NUM_ARGS BOOST_PP_ITERATION()
+#else
+#define BOOST_SIGNALS2_NUM_ARGS 1
+#endif
+
+// R, T1, T2, ..., TN, Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION \
+  BOOST_SIGNALS2_SIGNATURE_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS), \
+  Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      // helper for bound_extended_slot_function that handles specialization for void return
+      template<typename R>
+        class BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(BOOST_SIGNALS2_NUM_ARGS)
+      {
+      public:
+        typedef R result_type;
+        template<typename ExtendedSlotFunction BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+          BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+          result_type operator()(ExtendedSlotFunction &func, const connection &conn
+            BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+            BOOST_SIGNALS2_FULL_REF_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+        {
+          return func(conn BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+            BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+        }
+      };
+#ifdef BOOST_NO_VOID_RETURNS
+      template<>
+        class BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(BOOST_SIGNALS2_NUM_ARGS)<void>
+      {
+      public:
+        typedef result_type_wrapper<void>::type result_type;
+        template<typename ExtendedSlotFunction BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+          BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+          result_type operator()(ExtendedSlotFunction &func, const connection &conn
+            BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+            BOOST_SIGNALS2_FULL_REF_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+        {
+          func(conn BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+            BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+          return result_type();
+        }
+      };
+#endif
+// wrapper around an signalN::extended_slot_function which binds the
+// connection argument so it looks like a normal
+// signalN::slot_function
+
+      template<typename ExtendedSlotFunction>
+        class BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(BOOST_SIGNALS2_NUM_ARGS)
+      {
+      public:
+        typedef typename result_type_wrapper<typename ExtendedSlotFunction::result_type>::type result_type;
+        BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(BOOST_SIGNALS2_NUM_ARGS)(const ExtendedSlotFunction &fun):
+          _fun(fun), _connection(new connection)
+        {}
+        void set_connection(const connection &conn)
+        {
+          *_connection = conn;
+        }
+
+#if BOOST_SIGNALS2_NUM_ARGS > 0
+        template<BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+#endif // BOOST_SIGNALS2_NUM_ARGS > 0
+          result_type operator()(BOOST_SIGNALS2_FULL_REF_ARGS(BOOST_SIGNALS2_NUM_ARGS))
+        {
+          return BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(BOOST_SIGNALS2_NUM_ARGS)
+            <typename ExtendedSlotFunction::result_type>()
+            (_fun, *_connection BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+              BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+        }
+        // const overload
+#if BOOST_SIGNALS2_NUM_ARGS > 0
+        template<BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+#endif // BOOST_SIGNALS2_NUM_ARGS > 0
+          result_type operator()(BOOST_SIGNALS2_FULL_REF_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+        {
+          return BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(BOOST_SIGNALS2_NUM_ARGS)
+            <typename ExtendedSlotFunction::result_type>()
+            (_fun, *_connection BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+              BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+        }
+        template<typename T>
+          bool operator==(const T &other) const
+        {
+          return _fun == other;
+        }
+      private:
+        BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(BOOST_SIGNALS2_NUM_ARGS)()
+        {}
+
+        ExtendedSlotFunction _fun;
+        boost::shared_ptr<connection> _connection;
+      };
+
+      template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+        class BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+      template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+      class BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS) BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION
+      {
+      public:
+        typedef SlotFunction slot_function_type;
+        // typedef slotN<Signature, SlotFunction> slot_type;
+        typedef BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+          <BOOST_SIGNALS2_SIGNATURE_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS),
+          slot_function_type> slot_type;
+        typedef ExtendedSlotFunction extended_slot_function_type;
+        // typedef slotN+1<R, const connection &, T1, T2, ..., TN, extended_slot_function_type> extended_slot_type;
+        typedef BOOST_SIGNALS2_EXTENDED_SLOT_TYPE(BOOST_SIGNALS2_NUM_ARGS) extended_slot_type;
+        typedef typename nonvoid<typename slot_function_type::result_type>::type nonvoid_slot_result_type;
+      private:
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+        class slot_invoker;
+#else // BOOST_NO_VARIADIC_TEMPLATES
+        typedef variadic_slot_invoker<nonvoid_slot_result_type, Args...> slot_invoker;
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+        typedef slot_call_iterator_cache<nonvoid_slot_result_type, slot_invoker> slot_call_iterator_cache_type;
+        typedef typename group_key<Group>::type group_key_type;
+        typedef shared_ptr<connection_body<group_key_type, slot_type, Mutex> > connection_body_type;
+        typedef grouped_list<Group, GroupCompare, connection_body_type> connection_list_type;
+        typedef BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(BOOST_SIGNALS2_NUM_ARGS)<extended_slot_function_type>
+          bound_extended_slot_function_type;
+      public:
+        typedef Combiner combiner_type;
+        typedef typename result_type_wrapper<typename combiner_type::result_type>::type result_type;
+        typedef Group group_type;
+        typedef GroupCompare group_compare_type;
+        typedef typename detail::slot_call_iterator_t<slot_invoker,
+          typename connection_list_type::iterator, connection_body<group_key_type, slot_type, Mutex> > slot_call_iterator;
+
+        BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)(const combiner_type &combiner_arg,
+          const group_compare_type &group_compare):
+          _shared_state(new invocation_state(connection_list_type(group_compare), combiner_arg)),
+          _garbage_collector_it(_shared_state->connection_bodies().end())
+        {}
+        // connect slot
+        connection connect(const slot_type &slot, connect_position position = at_back)
+        {
+          unique_lock<mutex_type> lock(_mutex);
+          return nolock_connect(slot, position);
+        }
+        connection connect(const group_type &group,
+          const slot_type &slot, connect_position position = at_back)
+        {
+          unique_lock<Mutex> lock(_mutex);
+          return nolock_connect(group, slot, position);
+        }
+        // connect extended slot
+        connection connect_extended(const extended_slot_type &ext_slot, connect_position position = at_back)
+        {
+          unique_lock<mutex_type> lock(_mutex);
+          bound_extended_slot_function_type bound_slot(ext_slot.slot_function());
+          slot_type slot = replace_slot_function<slot_type>(ext_slot, bound_slot);
+          connection conn = nolock_connect(slot, position);
+          bound_slot.set_connection(conn);
+          return conn;
+        }
+        connection connect_extended(const group_type &group,
+          const extended_slot_type &ext_slot, connect_position position = at_back)
+        {
+          unique_lock<Mutex> lock(_mutex);
+          bound_extended_slot_function_type bound_slot(ext_slot.slot_function());
+          slot_type slot = replace_slot_function<slot_type>(ext_slot, bound_slot);
+          connection conn = nolock_connect(group, slot, position);
+          bound_slot.set_connection(conn);
+          return conn;
+        }
+        // disconnect slot(s)
+        void disconnect_all_slots()
+        {
+          shared_ptr<invocation_state> local_state =
+            get_readable_state();
+          typename connection_list_type::iterator it;
+          for(it = local_state->connection_bodies().begin();
+            it != local_state->connection_bodies().end(); ++it)
+          {
+            (*it)->disconnect();
+          }
+        }
+        void disconnect(const group_type &group)
+        {
+          shared_ptr<invocation_state> local_state =
+            get_readable_state();
+          group_key_type group_key(grouped_slots, group);
+          typename connection_list_type::iterator it;
+          typename connection_list_type::iterator end_it =
+            local_state->connection_bodies().upper_bound(group_key);
+          for(it = local_state->connection_bodies().lower_bound(group_key);
+            it != end_it; ++it)
+          {
+            (*it)->disconnect();
+          }
+        }
+        template <typename T>
+        void disconnect(const T &slot)
+        {
+          typedef mpl::bool_<(is_convertible<T, group_type>::value)> is_group;
+          do_disconnect(slot, is_group());
+        }
+        // emit signal
+        result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS))
+        {
+          shared_ptr<invocation_state> local_state;
+          typename connection_list_type::iterator it;
+          {
+            unique_lock<mutex_type> list_lock(_mutex);
+            // only clean up if it is safe to do so
+            if(_shared_state.unique())
+              nolock_cleanup_connections(false, 1);
+            /* Make a local copy of _shared_state while holding mutex, so we are
+            thread safe against the combiner or connection list getting modified
+            during invocation. */
+            local_state = _shared_state;
+          }
+          slot_invoker invoker = slot_invoker(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+          slot_call_iterator_cache_type cache(invoker);
+          invocation_janitor janitor(cache, *this, &local_state->connection_bodies());
+          return detail::combiner_invoker<typename combiner_type::result_type>()
+            (
+              local_state->combiner(),
+              slot_call_iterator(local_state->connection_bodies().begin(), local_state->connection_bodies().end(), cache),
+              slot_call_iterator(local_state->connection_bodies().end(), local_state->connection_bodies().end(), cache)
+            );
+        }
+        result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+        {
+          shared_ptr<invocation_state> local_state;
+          typename connection_list_type::iterator it;
+          {
+            unique_lock<mutex_type> list_lock(_mutex);
+            // only clean up if it is safe to do so
+            if(_shared_state.unique())
+              nolock_cleanup_connections(false, 1);
+            /* Make a local copy of _shared_state while holding mutex, so we are
+            thread safe against the combiner or connection list getting modified
+            during invocation. */
+            local_state = _shared_state;
+          }
+          slot_invoker invoker = slot_invoker(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+          slot_call_iterator_cache_type cache(invoker);
+          invocation_janitor janitor(cache, *this, &local_state->connection_bodies());
+          return detail::combiner_invoker<typename combiner_type::result_type>()
+            (
+              local_state->combiner(),
+              slot_call_iterator(local_state->connection_bodies().begin(), local_state->connection_bodies().end(), cache),
+              slot_call_iterator(local_state->connection_bodies().end(), local_state->connection_bodies().end(), cache)
+            );
+        }
+        std::size_t num_slots() const
+        {
+          shared_ptr<invocation_state> local_state =
+            get_readable_state();
+          typename connection_list_type::iterator it;
+          std::size_t count = 0;
+          for(it = local_state->connection_bodies().begin();
+            it != local_state->connection_bodies().end(); ++it)
+          {
+            if((*it)->connected()) ++count;
+          }
+          return count;
+        }
+        bool empty() const
+        {
+          shared_ptr<invocation_state> local_state =
+            get_readable_state();
+          typename connection_list_type::iterator it;
+          for(it = local_state->connection_bodies().begin();
+            it != local_state->connection_bodies().end(); ++it)
+          {
+            if((*it)->connected()) return false;
+          }
+          return true;
+        }
+        combiner_type combiner() const
+        {
+          unique_lock<mutex_type> lock(_mutex);
+          return _shared_state->combiner();
+        }
+        void set_combiner(const combiner_type &combiner_arg)
+        {
+          unique_lock<mutex_type> lock(_mutex);
+          if(_shared_state.unique())
+            _shared_state->combiner() = combiner_arg;
+          else
+            _shared_state.reset(new invocation_state(*_shared_state, combiner_arg));
+        }
+      private:
+        typedef Mutex mutex_type;
+
+        // slot_invoker is passed to slot_call_iterator_t to run slots
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+        class slot_invoker
+        {
+        public:
+          typedef nonvoid_slot_result_type result_type;
+// typename add_reference<Tn>::type
+#define BOOST_SIGNALS2_ADD_REF_TYPE(z, n, data) \
+  typename add_reference<BOOST_PP_CAT(T, BOOST_PP_INC(n))>::type
+// typename add_reference<Tn>::type argn
+#define BOOST_SIGNALS2_ADD_REF_ARG(z, n, data) \
+  BOOST_SIGNALS2_ADD_REF_TYPE(~, n, ~) \
+  BOOST_SIGNALS2_SIGNATURE_ARG_NAME(~, n, ~)
+// typename add_reference<T1>::type arg1, typename add_reference<T2>::type arg2, ..., typename add_reference<Tn>::type argn
+#define BOOST_SIGNALS2_ADD_REF_ARGS(arity) \
+  BOOST_PP_ENUM(arity, BOOST_SIGNALS2_ADD_REF_ARG, ~)
+          slot_invoker(BOOST_SIGNALS2_ADD_REF_ARGS(BOOST_SIGNALS2_NUM_ARGS)) BOOST_PP_EXPR_IF(BOOST_SIGNALS2_NUM_ARGS, :)
+#undef BOOST_SIGNALS2_ADD_REF_ARGS
+
+// m_argn
+#define BOOST_SIGNALS2_M_ARG_NAME(z, n, data) BOOST_PP_CAT(m_arg, BOOST_PP_INC(n))
+// m_argn ( argn )
+#define BOOST_SIGNALS2_MISC_STATEMENT(z, n, data) \
+  BOOST_SIGNALS2_M_ARG_NAME(~, n, ~) ( BOOST_SIGNALS2_SIGNATURE_ARG_NAME(~, n, ~) )
+// m_arg1(arg1), m_arg2(arg2), ..., m_argn(argn)
+            BOOST_PP_ENUM(BOOST_SIGNALS2_NUM_ARGS, BOOST_SIGNALS2_MISC_STATEMENT, ~)
+#undef BOOST_SIGNALS2_MISC_STATEMENT
+          {}
+          result_type operator ()(const connection_body_type &connectionBody) const
+          {
+            result_type *resolver = 0;
+            return m_invoke(connectionBody,
+              resolver);
+          }
+        private:
+          // declare assignment operator private since this class might have reference or const members
+          slot_invoker & operator=(const slot_invoker &);
+
+#define BOOST_SIGNALS2_ADD_REF_M_ARG_STATEMENT(z, n, data) \
+  BOOST_SIGNALS2_ADD_REF_TYPE(~, n, ~) BOOST_SIGNALS2_M_ARG_NAME(~, n, ~) ;
+          BOOST_PP_REPEAT(BOOST_SIGNALS2_NUM_ARGS, BOOST_SIGNALS2_ADD_REF_M_ARG_STATEMENT, ~)
+#undef BOOST_SIGNALS2_ADD_REF_M_ARG_STATEMENT
+#undef BOOST_SIGNALS2_ADD_REF_ARG
+#undef BOOST_SIGNALS2_ADD_REF_TYPE
+
+// m_arg1, m_arg2, ..., m_argn
+#define BOOST_SIGNALS2_M_ARG_NAMES(arity) BOOST_PP_ENUM(arity, BOOST_SIGNALS2_M_ARG_NAME, ~)
+          result_type m_invoke(const connection_body_type &connectionBody,
+            const void_type *) const
+          {
+            connectionBody->slot.slot_function()(BOOST_SIGNALS2_M_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+            return void_type();
+          }
+          result_type m_invoke(const connection_body_type &connectionBody, ...) const
+          {
+            return connectionBody->slot.slot_function()(BOOST_SIGNALS2_M_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+          }
+        };
+#undef BOOST_SIGNALS2_M_ARG_NAMES
+#undef BOOST_SIGNALS2_M_ARG_NAME
+
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+        // a struct used to optimize (minimize) the number of shared_ptrs that need to be created
+        // inside operator()
+        class invocation_state
+        {
+        public:
+          invocation_state(const connection_list_type &connections_in,
+            const combiner_type &combiner_in): _connection_bodies(new connection_list_type(connections_in)),
+            _combiner(new combiner_type(combiner_in))
+          {}
+          invocation_state(const invocation_state &other, const connection_list_type &connections_in):
+            _connection_bodies(new connection_list_type(connections_in)),
+            _combiner(other._combiner)
+          {}
+          invocation_state(const invocation_state &other, const combiner_type &combiner_in):
+            _connection_bodies(other._connection_bodies),
+            _combiner(new combiner_type(combiner_in))
+          {}
+          connection_list_type & connection_bodies() { return *_connection_bodies; }
+          const connection_list_type & connection_bodies() const { return *_connection_bodies; }
+          combiner_type & combiner() { return *_combiner; }
+          const combiner_type & combiner() const { return *_combiner; }
+        private:
+          invocation_state(const invocation_state &);
+
+          shared_ptr<connection_list_type> _connection_bodies;
+          shared_ptr<combiner_type> _combiner;
+        };
+        // Destructor of invocation_janitor does some cleanup when a signal invocation completes.
+        // Code can't be put directly in signal's operator() due to complications from void return types.
+        class invocation_janitor
+        {
+        public:
+          typedef BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS) signal_type;
+          invocation_janitor
+          (
+            const slot_call_iterator_cache_type &cache,
+            const signal_type &sig,
+            const connection_list_type *connection_bodies
+          ):_cache(cache), _sig(sig), _connection_bodies(connection_bodies)
+          {}
+          ~invocation_janitor()
+          {
+            // force a full cleanup of disconnected slots if there are too many
+            if(_cache.disconnected_slot_count > _cache.connected_slot_count)
+            {
+              _sig.force_cleanup_connections(_connection_bodies);
+            }
+          }
+        private:
+          const slot_call_iterator_cache_type &_cache;
+          const signal_type &_sig;
+          const connection_list_type *_connection_bodies;
+        };
+
+        // clean up disconnected connections
+        void nolock_cleanup_connections_from(bool grab_tracked,
+          const typename connection_list_type::iterator &begin, unsigned count = 0) const
+        {
+          BOOST_ASSERT(_shared_state.unique());
+          typename connection_list_type::iterator it;
+          unsigned i;
+          for(it = begin, i = 0;
+            it != _shared_state->connection_bodies().end() && (count == 0 || i < count);
+            ++i)
+          {
+            bool connected;
+            {
+              unique_lock<connection_body_base> lock(**it);
+              if(grab_tracked)
+                (*it)->nolock_slot_expired();
+              connected = (*it)->nolock_nograb_connected();
+            }// scoped lock destructs here, safe to erase now
+            if(connected == false)
+            {
+              it = _shared_state->connection_bodies().erase((*it)->group_key(), it);
+            }else
+            {
+              ++it;
+            }
+          }
+          _garbage_collector_it = it;
+        }
+        // clean up a few connections in constant time
+        void nolock_cleanup_connections(bool grab_tracked, unsigned count) const
+        {
+          BOOST_ASSERT(_shared_state.unique());
+          typename connection_list_type::iterator begin;
+          if(_garbage_collector_it == _shared_state->connection_bodies().end())
+          {
+            begin = _shared_state->connection_bodies().begin();
+          }else
+          {
+            begin = _garbage_collector_it;
+          }
+          nolock_cleanup_connections_from(grab_tracked, begin, count);
+        }
+        /* Make a new copy of the slot list if it is currently being read somewhere else
+        */
+        void nolock_force_unique_connection_list()
+        {
+          if(_shared_state.unique() == false)
+          {
+            _shared_state.reset(new invocation_state(*_shared_state, _shared_state->connection_bodies()));
+            nolock_cleanup_connections_from(true, _shared_state->connection_bodies().begin());
+          }else
+          {
+            /* We need to try and check more than just 1 connection here to avoid corner
+            cases where certain repeated connect/disconnect patterns cause the slot
+            list to grow without limit. */
+            nolock_cleanup_connections(true, 2);
+          }
+        }
+        // force a full cleanup of the connection list
+        void force_cleanup_connections(const connection_list_type *connection_bodies) const
+        {
+          unique_lock<mutex_type> list_lock(_mutex);
+          // if the connection list passed in as a parameter is no longer in use,
+          // we don't need to do any cleanup.
+          if(&_shared_state->connection_bodies() != connection_bodies)
+          {
+            return;
+          }
+          if(_shared_state.unique() == false)
+          {
+            _shared_state.reset(new invocation_state(*_shared_state, _shared_state->connection_bodies()));
+          }
+          nolock_cleanup_connections_from(false, _shared_state->connection_bodies().begin());
+        }
+        shared_ptr<invocation_state> get_readable_state() const
+        {
+          unique_lock<mutex_type> list_lock(_mutex);
+          return _shared_state;
+        }
+        connection_body_type create_new_connection(const slot_type &slot)
+        {
+          nolock_force_unique_connection_list();
+          return connection_body_type(new connection_body<group_key_type, slot_type, Mutex>(slot));
+        }
+        void do_disconnect(const group_type &group, mpl::bool_<true> /* is_group */)
+        {
+          disconnect(group);
+        }
+        template<typename T>
+        void do_disconnect(const T &slot, mpl::bool_<false> /* is_group */)
+        {
+          shared_ptr<invocation_state> local_state =
+            get_readable_state();
+          typename connection_list_type::iterator it;
+          for(it = local_state->connection_bodies().begin();
+            it != local_state->connection_bodies().end(); ++it)
+          {
+            unique_lock<connection_body_base> lock(**it);
+            if((*it)->slot.slot_function() == slot)
+            {
+              (*it)->nolock_disconnect();
+            }else
+            {
+              // check for wrapped extended slot
+              bound_extended_slot_function_type *fp;
+              fp = (*it)->slot.slot_function().template target<bound_extended_slot_function_type>();
+              if(fp && *fp == slot)
+              {
+                (*it)->nolock_disconnect();
+              }
+            }
+          }
+        }
+        // connect slot
+        connection nolock_connect(const slot_type &slot, connect_position position)
+        {
+          connection_body_type newConnectionBody =
+            create_new_connection(slot);
+          group_key_type group_key;
+          if(position == at_back)
+          {
+            group_key.first = back_ungrouped_slots;
+            _shared_state->connection_bodies().push_back(group_key, newConnectionBody);
+          }else
+          {
+            group_key.first = front_ungrouped_slots;
+            _shared_state->connection_bodies().push_front(group_key, newConnectionBody);
+          }
+          newConnectionBody->set_group_key(group_key);
+          return connection(newConnectionBody);
+        }
+        connection nolock_connect(const group_type &group,
+          const slot_type &slot, connect_position position)
+        {
+          connection_body_type newConnectionBody =
+            create_new_connection(slot);
+          // update map to first connection body in group if needed
+          group_key_type group_key(grouped_slots, group);
+          newConnectionBody->set_group_key(group_key);
+          if(position == at_back)
+          {
+            _shared_state->connection_bodies().push_back(group_key, newConnectionBody);
+          }else  // at_front
+          {
+            _shared_state->connection_bodies().push_front(group_key, newConnectionBody);
+          }
+          return connection(newConnectionBody);
+        }
+
+        // _shared_state is mutable so we can do force_cleanup_connections during a const invocation
+        mutable shared_ptr<invocation_state> _shared_state;
+        mutable typename connection_list_type::iterator _garbage_collector_it;
+        // connection list mutex must never be locked when attempting a blocking lock on a slot,
+        // or you could deadlock.
+        mutable mutex_type _mutex;
+      };
+
+      template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+        class BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+    }
+
+    template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_DEFAULTED_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+      class BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+    template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+    class BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+      BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION: public signal_base,
+      public detail::BOOST_SIGNALS2_STD_FUNCTIONAL_BASE
+        (typename detail::result_type_wrapper<typename Combiner::result_type>::type)
+    {
+      typedef detail::BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION> impl_class;
+    public:
+      typedef detail::BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION> weak_signal_type;
+      friend class detail::BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION>;
+
+      typedef SlotFunction slot_function_type;
+      // typedef slotN<Signature, SlotFunction> slot_type;
+      typedef typename impl_class::slot_type slot_type;
+      typedef typename impl_class::extended_slot_function_type extended_slot_function_type;
+      typedef typename impl_class::extended_slot_type extended_slot_type;
+      typedef typename slot_function_type::result_type slot_result_type;
+      typedef Combiner combiner_type;
+      typedef typename impl_class::result_type result_type;
+      typedef Group group_type;
+      typedef GroupCompare group_compare_type;
+      typedef typename impl_class::slot_call_iterator
+        slot_call_iterator;
+      typedef typename mpl::identity<BOOST_SIGNALS2_SIGNATURE_FUNCTION_TYPE(BOOST_SIGNALS2_NUM_ARGS)>::type signature_type;
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+
+// typedef Tn argn_type;
+#define BOOST_SIGNALS2_MISC_STATEMENT(z, n, data) \
+  typedef BOOST_PP_CAT(T, BOOST_PP_INC(n)) BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(n)), _type);
+      BOOST_PP_REPEAT(BOOST_SIGNALS2_NUM_ARGS, BOOST_SIGNALS2_MISC_STATEMENT, ~)
+#undef BOOST_SIGNALS2_MISC_STATEMENT
+#if BOOST_SIGNALS2_NUM_ARGS == 1
+      typedef arg1_type argument_type;
+#elif BOOST_SIGNALS2_NUM_ARGS == 2
+      typedef arg1_type first_argument_type;
+      typedef arg2_type second_argument_type;
+#endif
+
+      template<unsigned n> class arg : public
+        detail::BOOST_SIGNALS2_PREPROCESSED_ARG_N_TYPE_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <n BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+        BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS)>
+      {};
+
+      BOOST_STATIC_CONSTANT(int, arity = BOOST_SIGNALS2_NUM_ARGS);
+
+#else // BOOST_NO_VARIADIC_TEMPLATES
+
+      template<unsigned n> class arg
+      {
+      public:
+        typedef typename detail::variadic_arg_type<n, Args...>::type type;
+      };
+      BOOST_STATIC_CONSTANT(int, arity = sizeof...(Args));
+
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+
+      BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)(const combiner_type &combiner_arg = combiner_type(),
+        const group_compare_type &group_compare = group_compare_type()):
+        _pimpl(new impl_class(combiner_arg, group_compare))
+      {};
+      virtual ~BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)()
+      {
+        disconnect_all_slots();
+      }
+      connection connect(const slot_type &slot, connect_position position = at_back)
+      {
+        return (*_pimpl).connect(slot, position);
+      }
+      connection connect(const group_type &group,
+        const slot_type &slot, connect_position position = at_back)
+      {
+        return (*_pimpl).connect(group, slot, position);
+      }
+      connection connect_extended(const extended_slot_type &slot, connect_position position = at_back)
+      {
+        return (*_pimpl).connect_extended(slot, position);
+      }
+      connection connect_extended(const group_type &group,
+        const extended_slot_type &slot, connect_position position = at_back)
+      {
+        return (*_pimpl).connect_extended(group, slot, position);
+      }
+      void disconnect_all_slots()
+      {
+        (*_pimpl).disconnect_all_slots();
+      }
+      void disconnect(const group_type &group)
+      {
+        (*_pimpl).disconnect(group);
+      }
+      template <typename T>
+      void disconnect(const T &slot)
+      {
+        (*_pimpl).disconnect(slot);
+      }
+      result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS))
+      {
+        return (*_pimpl)(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+      }
+      result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+      {
+        return (*_pimpl)(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+      }
+      std::size_t num_slots() const
+      {
+        return (*_pimpl).num_slots();
+      }
+      bool empty() const
+      {
+        return (*_pimpl).empty();
+      }
+      combiner_type combiner() const
+      {
+        return (*_pimpl).combiner();
+      }
+      void set_combiner(const combiner_type &combiner_arg)
+      {
+        return (*_pimpl).set_combiner(combiner_arg);
+      }
+    protected:
+      virtual shared_ptr<void> lock_pimpl() const
+      {
+        return _pimpl;
+      }
+    private:
+      shared_ptr<impl_class>
+        _pimpl;
+    };
+
+    namespace detail
+    {
+      // wrapper class for storing other signals as slots with automatic lifetime tracking
+      template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+        class BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+      template<BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+        class BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION
+      {
+      public:
+        typedef typename BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+          <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION>::result_type
+          result_type;
+
+        BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+          (const BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+          <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION>
+          &signal):
+          _weak_pimpl(signal._pimpl)
+        {}
+        result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS))
+        {
+          shared_ptr<detail::BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+            <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION> >
+            shared_pimpl(_weak_pimpl.lock());
+          if(shared_pimpl == 0) boost::throw_exception(expired_slot());
+          return (*shared_pimpl)(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+        }
+        result_type operator ()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+        {
+          shared_ptr<detail::BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+            <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION> >
+            shared_pimpl(_weak_pimpl.lock());
+          if(shared_pimpl == 0) boost::throw_exception(expired_slot());
+          return (*shared_pimpl)(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+        }
+      private:
+        boost::weak_ptr<detail::BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+          <BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION> > _weak_pimpl;
+      };
+
+#ifndef BOOST_NO_VARIADIC_TEMPLATES
+      template<int arity, typename Signature>
+        class extended_signature: public variadic_extended_signature<Signature>
+      {};
+#else // BOOST_NO_VARIADIC_TEMPLATES
+      template<int arity, typename Signature>
+        class extended_signature;
+      // partial template specialization
+      template<typename Signature>
+        class extended_signature<BOOST_SIGNALS2_NUM_ARGS, Signature>
+      {
+      public:
+// typename function_traits<Signature>::result_type (
+// const boost::signals2::connection &,
+// typename function_traits<Signature>::arg1_type,
+// typename function_traits<Signature>::arg2_type,
+// ...,
+// typename function_traits<Signature>::argn_type)
+#define BOOST_SIGNALS2_EXT_SIGNATURE(arity, Signature) \
+  typename function_traits<Signature>::result_type ( \
+  const boost::signals2::connection & BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS) \
+  BOOST_PP_ENUM(arity, BOOST_SIGNALS2_SIGNATURE_TO_ARGN_TYPE, Signature) )
+        typedef function<BOOST_SIGNALS2_EXT_SIGNATURE(BOOST_SIGNALS2_NUM_ARGS, Signature)> function_type;
+#undef BOOST_SIGNALS2_EXT_SIGNATURE
+      };
+
+      template<unsigned arity, typename Signature, typename Combiner,
+        typename Group, typename GroupCompare, typename SlotFunction,
+        typename ExtendedSlotFunction, typename Mutex>
+      class signalN;
+      // partial template specialization
+      template<typename Signature, typename Combiner, typename Group,
+        typename GroupCompare, typename SlotFunction,
+        typename ExtendedSlotFunction, typename Mutex>
+      class signalN<BOOST_SIGNALS2_NUM_ARGS, Signature, Combiner, Group,
+        GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex>
+      {
+      public:
+        typedef BOOST_SIGNALS2_SIGNAL_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)<
+          BOOST_SIGNALS2_PORTABLE_SIGNATURE(BOOST_SIGNALS2_NUM_ARGS, Signature),
+          Combiner, Group,
+          GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex> type;
+      };
+
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#undef BOOST_SIGNALS2_NUM_ARGS
+#undef BOOST_SIGNALS2_SIGNAL_TEMPLATE_INSTANTIATION

test/external/boost/signals2/detail/signals_common.hpp

@@ -0,0 +1,77 @@
+// Boost.Signals library
+
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2007. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_SIGNALS_COMMON_HPP
+#define BOOST_SIGNALS2_SIGNALS_COMMON_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/ref.hpp>
+#include <boost/signals2/signal_base.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+
+namespace boost {
+  namespace signals2 {
+    namespace detail {
+      // Determine if the given type T is a signal
+      template<typename T>
+      class is_signal: public mpl::bool_<is_base_of<signal_base, T>::value>
+      {};
+
+      // A slot can be a signal, a reference to a function object, or a
+      // function object.
+      struct signal_tag {};
+      struct reference_tag {};
+      struct value_tag {};
+
+      // Classify the given slot as a signal, a reference-to-slot, or a
+      // standard slot
+      template<typename S>
+      class get_slot_tag {
+        typedef typename mpl::if_<is_signal<S>,
+          signal_tag, value_tag>::type signal_or_value;
+      public:
+        typedef typename mpl::if_<is_reference_wrapper<S>,
+                            reference_tag,
+                            signal_or_value>::type type;
+      };
+
+      // Get the slot so that it can be copied
+      template<typename F>
+      typename F::weak_signal_type
+      get_invocable_slot(const F &signal, signal_tag)
+      { return typename F::weak_signal_type(signal); }
+
+      template<typename F>
+      const F&
+      get_invocable_slot(const F& f, reference_tag)
+      { return f; }
+
+      template<typename F>
+      const F&
+      get_invocable_slot(const F& f, value_tag)
+      { return f; }
+
+      // Determines the type of the slot - is it a signal, a reference to a
+      // slot or just a normal slot.
+      template<typename F>
+      typename get_slot_tag<F>::type
+      tag_type(const F&)
+      {
+        typedef typename get_slot_tag<F>::type
+          the_tag_type;
+        the_tag_type tag = the_tag_type();
+        return tag;
+      }
+    } // end namespace detail
+  } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_SIGNALS_COMMON_HPP

test/external/boost/signals2/detail/signals_common_macros.hpp

@@ -0,0 +1,213 @@
+/*
+  Author: Frank Mori Hess <fmhess@users.sourceforge.net>
+  Begin: 2007-01-23
+*/
+// Copyright Frank Mori Hess 2007-2008
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_SIGNALS2_SIGNALS_COMMON_MACROS_HPP
+#define BOOST_SIGNALS2_SIGNALS_COMMON_MACROS_HPP
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+
+#ifndef BOOST_SIGNALS2_MAX_ARGS
+#define BOOST_SIGNALS2_MAX_ARGS 9
+#endif
+
+// signaln
+#define BOOST_SIGNALS2_SIGNAL_CLASS_NAME(arity) BOOST_PP_CAT(signal, arity)
+// weak_signaln
+#define BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(arity) BOOST_PP_CAT(weak_, BOOST_SIGNALS2_SIGNAL_CLASS_NAME(arity))
+// signaln_impl
+#define BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(arity) BOOST_PP_CAT(BOOST_SIGNALS2_SIGNAL_CLASS_NAME(arity), _impl)
+// argn
+#define BOOST_SIGNALS2_SIGNATURE_ARG_NAME(z, n, data) BOOST_PP_CAT(arg, BOOST_PP_INC(n))
+// Tn argn
+#define BOOST_SIGNALS2_SIGNATURE_FULL_ARG(z, n, data) \
+  BOOST_PP_CAT(T, BOOST_PP_INC(n)) BOOST_SIGNALS2_SIGNATURE_ARG_NAME(~, n, ~)
+// T1 arg1, T2 arg2, ..., Tn argn
+#define BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(arity) \
+  BOOST_PP_ENUM(arity, BOOST_SIGNALS2_SIGNATURE_FULL_ARG, ~)
+// arg1, arg2, ..., argn
+#define BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(arity) BOOST_PP_ENUM(arity, BOOST_SIGNALS2_SIGNATURE_ARG_NAME, ~)
+// T1, T2, ..., TN
+#define BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(arity) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), T)
+// R (T1, T2, ..., TN)
+#define BOOST_SIGNALS2_SIGNATURE_FUNCTION_TYPE(arity) \
+  R ( BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(arity) )
+// typename prefixR, typename prefixT1, typename prefixT2, ..., typename prefixTN
+#define BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_DECL(arity, prefix) \
+  typename BOOST_PP_CAT(prefix, R) BOOST_PP_COMMA_IF(arity) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), typename BOOST_PP_CAT(prefix, T))
+// typename R, typename T1, typename T2, ..., typename TN
+#define BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(arity) \
+  typename R BOOST_PP_COMMA_IF(arity) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), typename T)
+// typename prefixT1, typename prefixT2, ..., typename prefixTN
+#define BOOST_SIGNALS2_PREFIXED_ARGS_TEMPLATE_DECL(arity, prefix) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), typename BOOST_PP_CAT(prefix, T))
+// typename T1, typename T2, ..., typename TN
+#define BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(arity) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), typename T)
+// prefixR, prefixT1, prefixT2, ..., prefixTN
+#define BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_INSTANTIATION(arity, prefix) \
+  BOOST_PP_CAT(prefix, R) BOOST_PP_COMMA_IF(arity) BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), BOOST_PP_CAT(prefix, T))
+// R, T1, T2, ..., TN
+#define BOOST_SIGNALS2_SIGNATURE_TEMPLATE_INSTANTIATION(arity) \
+  R BOOST_PP_COMMA_IF(arity) BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), T)
+// boost::functionN<R, T1, T2, ..., TN>
+#define BOOST_SIGNALS2_FUNCTION_N_DECL(arity) BOOST_PP_CAT(boost::function, arity)<\
+  BOOST_SIGNALS2_SIGNATURE_TEMPLATE_INSTANTIATION(arity) >
+// R, const boost::signals2::connection&, T1, T2, ..., TN
+#define BOOST_SIGNALS2_EXT_SLOT_TEMPLATE_INSTANTIATION(arity) \
+  R, const boost::signals2::connection&  BOOST_PP_COMMA_IF(arity) \
+  BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(arity), T)
+// boost::functionN<R, const boost::signals2::connection &, T1, T2, ..., TN>
+#define BOOST_SIGNALS2_EXT_FUNCTION_N_DECL(arity) BOOST_PP_CAT(boost::function, BOOST_PP_INC(arity))<\
+  BOOST_SIGNALS2_EXT_SLOT_TEMPLATE_INSTANTIATION(arity) >
+// slotN
+#define BOOST_SIGNALS2_SLOT_CLASS_NAME(arity) BOOST_PP_CAT(slot, arity)
+// slotN+1<R, const connection &, T1, T2, ..., TN, extended_slot_function_type>
+#define BOOST_SIGNALS2_EXTENDED_SLOT_TYPE(arity) \
+  BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_PP_INC(arity))< \
+  BOOST_SIGNALS2_EXT_SLOT_TEMPLATE_INSTANTIATION(arity), \
+  extended_slot_function_type>
+// bound_extended_slot_functionN
+#define BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(arity) BOOST_PP_CAT(bound_extended_slot_function, arity)
+// bound_extended_slot_function_helperN
+#define BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(arity) BOOST_PP_CAT(bound_extended_slot_function_invoker, arity)
+// typename function_traits<Signature>::argn_type
+#define BOOST_SIGNALS2_SIGNATURE_TO_ARGN_TYPE(z, n, Signature) \
+  BOOST_PP_CAT(BOOST_PP_CAT(typename function_traits<Signature>::arg, BOOST_PP_INC(n)), _type)
+// typename function_traits<Signature>::result_type,
+// typename function_traits<Signature>::arg1_type,
+// typename function_traits<Signature>::arg2_type,
+// ...,
+// typename function_traits<Signature>::argn_type
+#define BOOST_SIGNALS2_PORTABLE_SIGNATURE(arity, Signature) \
+  typename function_traits<Signature>::result_type \
+  BOOST_PP_COMMA_IF(arity) BOOST_PP_ENUM(arity, BOOST_SIGNALS2_SIGNATURE_TO_ARGN_TYPE, Signature)
+// prefixTn & argn
+#define BOOST_SIGNALS2_PREFIXED_FULL_REF_ARG(z, n, prefix) \
+  BOOST_PP_CAT(BOOST_PP_CAT(prefix, T), BOOST_PP_INC(n)) & BOOST_SIGNALS2_SIGNATURE_ARG_NAME(~, n, ~)
+// prefixT1 & arg1, prefixT2 & arg2, ..., prefixTn & argn
+#define BOOST_SIGNALS2_PREFIXED_FULL_REF_ARGS(arity, prefix) \
+  BOOST_PP_ENUM(arity, BOOST_SIGNALS2_PREFIXED_FULL_REF_ARG, prefix)
+// Tn & argn
+#define BOOST_SIGNALS2_FULL_REF_ARG(z, n, data) \
+  BOOST_PP_CAT(T, BOOST_PP_INC(n)) & BOOST_SIGNALS2_SIGNATURE_ARG_NAME(~, n, ~)
+// T1 & arg1, T2 & arg2, ..., Tn & argn
+#define BOOST_SIGNALS2_FULL_REF_ARGS(arity) \
+  BOOST_PP_ENUM(arity, BOOST_SIGNALS2_FULL_REF_ARG, ~)
+// preprocessed_arg_typeN
+#define BOOST_SIGNALS2_PREPROCESSED_ARG_N_TYPE_CLASS_NAME(arity) BOOST_PP_CAT(preprocessed_arg_type, arity)
+
+// typename R, typename T1, typename T2, ..., typename TN, typename SlotFunction
+#define BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION_DECL(arity) \
+  BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(arity), \
+  typename SlotFunction
+#define BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION
+
+// typename R, typename T1, typename T2, ..., typename TN, typename Combiner, ...
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(arity) \
+  BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(arity), \
+  typename Combiner, \
+  typename Group, \
+  typename GroupCompare, \
+  typename SlotFunction, \
+  typename ExtendedSlotFunction, \
+  typename Mutex
+// typename R, typename T1, typename T2, ..., typename TN, typename Combiner = optional_last_value<R>, ...
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_DEFAULTED_DECL(arity) \
+  BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(arity), \
+  typename Combiner = optional_last_value<R>, \
+  typename Group = int, \
+  typename GroupCompare = std::less<Group>, \
+  typename SlotFunction = BOOST_SIGNALS2_FUNCTION_N_DECL(arity), \
+  typename ExtendedSlotFunction = BOOST_SIGNALS2_EXT_FUNCTION_N_DECL(arity), \
+  typename Mutex = signals2::mutex
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION_DECL(arity) BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(arity)
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION
+
+#define BOOST_SIGNALS2_STD_FUNCTIONAL_BASE(result_type) std_functional_base
+
+#define BOOST_SIGNALS2_PP_COMMA_IF(arity) BOOST_PP_COMMA_IF(arity)
+
+#else // BOOST_NO_VARIADIC_TEMPLATES
+
+#define BOOST_SIGNALS2_SIGNAL_CLASS_NAME(arity) signal
+#define BOOST_SIGNALS2_WEAK_SIGNAL_CLASS_NAME(arity) weak_signal
+#define BOOST_SIGNALS2_SIGNAL_IMPL_CLASS_NAME(arity) signal_impl
+#define BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(arity) typename Signature
+#define BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(arity) Args...
+#define BOOST_SIGNALS2_SIGNATURE_TEMPLATE_INSTANTIATION(arity) R (Args...)
+#define BOOST_SIGNALS2_SIGNATURE_FUNCTION_TYPE(arity) R (Args...)
+#define BOOST_SIGNALS2_ARGS_TEMPLATE_DECL(arity) typename ... Args
+#define BOOST_SIGNALS2_FULL_REF_ARGS(arity) Args & ... args
+#define BOOST_SIGNALS2_SLOT_CLASS_NAME(arity) slot
+#define BOOST_SIGNALS2_EXTENDED_SLOT_TYPE(arity) slot<R (const connection &, Args...), extended_slot_function_type>
+#define BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_N(arity) bound_extended_slot_function
+#define BOOST_SIGNALS2_BOUND_EXTENDED_SLOT_FUNCTION_INVOKER_N(arity) bound_extended_slot_function_invoker
+#define BOOST_SIGNALS2_FUNCTION_N_DECL(arity) boost::function<Signature>
+#define BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_DECL(arity, prefix) typename prefixSignature
+#define BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_INSTANTIATION(arity, prefix) prefixSignature
+#define BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(arity) Args ... args
+#define BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(arity) args...
+#define BOOST_SIGNALS2_PORTABLE_SIGNATURE(arity, Signature) Signature
+#define BOOST_SIGNALS2_SLOT_CLASS_NAME(arity) slot
+
+#define BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION_DECL(arity) \
+  typename SlotFunction, \
+  typename R, \
+  typename ... Args
+#define BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION \
+  <R (Args...), SlotFunction>
+
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_DECL(arity) \
+  typename Signature, \
+  typename Combiner, \
+  typename Group, \
+  typename GroupCompare, \
+  typename SlotFunction, \
+  typename ExtendedSlotFunction, \
+  typename Mutex
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_DEFAULTED_DECL(arity) \
+  typename Signature, \
+  typename Combiner = optional_last_value<typename boost::function_traits<Signature>::result_type>, \
+  typename Group = int, \
+  typename GroupCompare = std::less<Group>, \
+  typename SlotFunction = boost::function<Signature>, \
+  typename ExtendedSlotFunction = typename detail::variadic_extended_signature<Signature>::function_type, \
+  typename Mutex = signals2::mutex
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION_DECL(arity) \
+  typename Combiner, \
+  typename Group, \
+  typename GroupCompare, \
+  typename SlotFunction, \
+  typename ExtendedSlotFunction, \
+  typename Mutex, \
+  typename R, \
+  typename ... Args
+#define BOOST_SIGNALS2_SIGNAL_TEMPLATE_SPECIALIZATION <\
+  R (Args...), \
+  Combiner, \
+  Group, \
+  GroupCompare, \
+  SlotFunction, \
+  ExtendedSlotFunction, \
+  Mutex>
+
+#define BOOST_SIGNALS2_STD_FUNCTIONAL_BASE(result_type) \
+  std_functional_base<result_type , Args...>
+
+#define BOOST_SIGNALS2_PP_COMMA_IF(arity) ,
+
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+
+#endif // BOOST_SIGNALS2_SIGNALS_COMMON_MACROS_HPP

test/external/boost/signals2/detail/slot_call_iterator.hpp

@@ -0,0 +1,147 @@
+// Boost.Signals2 library
+
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2007-2008.
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP
+#define BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP
+
+#include <boost/assert.hpp>
+#include <boost/aligned_storage.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+#include <boost/optional.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/signals2/connection.hpp>
+#include <boost/signals2/slot_base.hpp>
+#include <boost/signals2/detail/auto_buffer.hpp>
+#include <boost/signals2/detail/unique_lock.hpp>
+#include <boost/weak_ptr.hpp>
+
+namespace boost {
+  namespace signals2 {
+    namespace detail {
+      template<typename ResultType, typename Function>
+        class slot_call_iterator_cache
+      {
+      public:
+        slot_call_iterator_cache(const Function &f_arg):
+          f(f_arg),
+          connected_slot_count(0),
+          disconnected_slot_count(0)
+        {}
+        optional<ResultType> result;
+        typedef auto_buffer<void_shared_ptr_variant, store_n_objects<10> > tracked_ptrs_type;
+        tracked_ptrs_type tracked_ptrs;
+        Function f;
+        unsigned connected_slot_count;
+        unsigned disconnected_slot_count;
+      };
+
+      // Generates a slot call iterator. Essentially, this is an iterator that:
+      //   - skips over disconnected slots in the underlying list
+      //   - calls the connected slots when dereferenced
+      //   - caches the result of calling the slots
+      template<typename Function, typename Iterator, typename ConnectionBody>
+      class slot_call_iterator_t
+        : public boost::iterator_facade<slot_call_iterator_t<Function, Iterator, ConnectionBody>,
+        typename Function::result_type,
+        boost::single_pass_traversal_tag,
+        typename Function::result_type const&>
+      {
+        typedef boost::iterator_facade<slot_call_iterator_t<Function, Iterator, ConnectionBody>,
+          typename Function::result_type,
+          boost::single_pass_traversal_tag,
+          typename Function::result_type const&>
+        inherited;
+
+        typedef typename Function::result_type result_type;
+
+        friend class boost::iterator_core_access;
+
+      public:
+        slot_call_iterator_t(Iterator iter_in, Iterator end_in,
+          slot_call_iterator_cache<result_type, Function> &c):
+          iter(iter_in), end(end_in),
+          cache(&c), callable_iter(end_in)
+        {
+          lock_next_callable();
+        }
+
+        typename inherited::reference
+        dereference() const
+        {
+          if (!cache->result) {
+            try
+            {
+              cache->result.reset(cache->f(*iter));
+            }
+            catch(expired_slot &)
+            {
+              (*iter)->disconnect();
+              throw;
+            }
+          }
+          return cache->result.get();
+        }
+
+        void increment()
+        {
+          ++iter;
+          lock_next_callable();
+          cache->result.reset();
+        }
+
+        bool equal(const slot_call_iterator_t& other) const
+        {
+          return iter == other.iter;
+        }
+
+      private:
+        typedef unique_lock<connection_body_base> lock_type;
+
+        void lock_next_callable() const
+        {
+          if(iter == callable_iter)
+          {
+            return;
+          }
+          for(;iter != end; ++iter)
+          {
+            lock_type lock(**iter);
+            cache->tracked_ptrs.clear();
+            (*iter)->nolock_grab_tracked_objects(std::back_inserter(cache->tracked_ptrs));
+            if((*iter)->nolock_nograb_connected())
+            {
+              ++cache->connected_slot_count;
+            }else
+            {
+              ++cache->disconnected_slot_count;
+            }
+            if((*iter)->nolock_nograb_blocked() == false)
+            {
+              callable_iter = iter;
+              break;
+            }
+          }
+          if(iter == end)
+          {
+            callable_iter = end;
+          }
+        }
+
+        mutable Iterator iter;
+        Iterator end;
+        slot_call_iterator_cache<result_type, Function> *cache;
+        mutable Iterator callable_iter;
+      };
+    } // end namespace detail
+  } // end namespace BOOST_SIGNALS_NAMESPACE
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP

test/external/boost/signals2/detail/slot_groups.hpp

@@ -0,0 +1,235 @@
+// Boost.Signals2 library
+
+// Copyright Frank Mori Hess 2007-2008.
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_SLOT_GROUPS_HPP
+#define BOOST_SIGNALS2_SLOT_GROUPS_HPP
+
+#include <boost/signals2/connection.hpp>
+#include <boost/optional.hpp>
+#include <list>
+#include <map>
+#include <utility>
+
+namespace boost {
+  namespace signals2 {
+    namespace detail {
+      enum slot_meta_group {front_ungrouped_slots, grouped_slots, back_ungrouped_slots};
+      template<typename Group>
+      struct group_key
+      {
+        typedef std::pair<enum slot_meta_group, boost::optional<Group> > type;
+      };
+      template<typename Group, typename GroupCompare>
+      class group_key_less
+      {
+      public:
+        group_key_less()
+        {}
+        group_key_less(const GroupCompare &group_compare): _group_compare(group_compare)
+        {}
+        bool operator ()(const typename group_key<Group>::type &key1, const typename group_key<Group>::type &key2) const
+        {
+          if(key1.first != key2.first) return key1.first < key2.first;
+          if(key1.first != grouped_slots) return false;
+          return _group_compare(key1.second.get(), key2.second.get());
+        }
+      private:
+        GroupCompare _group_compare;
+      };
+      template<typename Group, typename GroupCompare, typename ValueType>
+      class grouped_list
+      {
+      public:
+        typedef group_key_less<Group, GroupCompare> group_key_compare_type;
+      private:
+        typedef std::list<ValueType> list_type;
+        typedef std::map
+          <
+            typename group_key<Group>::type,
+            typename list_type::iterator,
+            group_key_compare_type
+          > map_type;
+        typedef typename map_type::iterator map_iterator;
+        typedef typename map_type::const_iterator const_map_iterator;
+      public:
+        typedef typename list_type::iterator iterator;
+        typedef typename list_type::const_iterator const_iterator;
+        typedef typename group_key<Group>::type group_key_type;
+
+        grouped_list(const group_key_compare_type &group_key_compare):
+          _group_key_compare(group_key_compare)
+        {}
+        grouped_list(const grouped_list &other): _list(other._list),
+          _group_map(other._group_map), _group_key_compare(other._group_key_compare)
+        {
+          // fix up _group_map
+          typename map_type::const_iterator other_map_it;
+          typename list_type::iterator this_list_it = _list.begin();
+          typename map_type::iterator this_map_it = _group_map.begin();
+          for(other_map_it = other._group_map.begin();
+            other_map_it != other._group_map.end();
+            ++other_map_it, ++this_map_it)
+          {
+            BOOST_ASSERT(this_map_it != _group_map.end());
+            this_map_it->second = this_list_it;
+            typename list_type::const_iterator other_list_it = other.get_list_iterator(other_map_it);
+            typename map_type::const_iterator other_next_map_it = other_map_it;
+            ++other_next_map_it;
+            typename list_type::const_iterator other_next_list_it = other.get_list_iterator(other_next_map_it);
+            while(other_list_it != other_next_list_it)
+            {
+              ++other_list_it;
+              ++this_list_it;
+            }
+          }
+        }
+        iterator begin()
+        {
+          return _list.begin();
+        }
+        iterator end()
+        {
+          return _list.end();
+        }
+        iterator lower_bound(const group_key_type &key)
+        {
+          map_iterator map_it = _group_map.lower_bound(key);
+          return get_list_iterator(map_it);
+        }
+        iterator upper_bound(const group_key_type &key)
+        {
+          map_iterator map_it = _group_map.upper_bound(key);
+          return get_list_iterator(map_it);
+        }
+        void push_front(const group_key_type &key, const ValueType &value)
+        {
+          map_iterator map_it;
+          if(key.first == front_ungrouped_slots)
+          {// optimization
+            map_it = _group_map.begin();
+          }else
+          {
+            map_it = _group_map.lower_bound(key);
+          }
+          m_insert(map_it, key, value);
+        }
+        void push_back(const group_key_type &key, const ValueType &value)
+        {
+          map_iterator map_it;
+          if(key.first == back_ungrouped_slots)
+          {// optimization
+            map_it = _group_map.end();
+          }else
+          {
+            map_it = _group_map.upper_bound(key);
+          }
+          m_insert(map_it, key, value);
+        }
+        void erase(const group_key_type &key)
+        {
+          map_iterator map_it = _group_map.lower_bound(key);
+          iterator begin_list_it = get_list_iterator(map_it);
+          iterator end_list_it = upper_bound(key);
+          if(begin_list_it != end_list_it)
+          {
+            _list.erase(begin_list_it, end_list_it);
+            _group_map.erase(map_it);
+          }
+        }
+        iterator erase(const group_key_type &key, const iterator &it)
+        {
+          BOOST_ASSERT(it != _list.end());
+          map_iterator map_it = _group_map.lower_bound(key);
+          BOOST_ASSERT(map_it != _group_map.end());
+          BOOST_ASSERT(weakly_equivalent(map_it->first, key));
+          if(map_it->second == it)
+          {
+            iterator next = it;
+            ++next;
+            // if next is in same group
+            if(next != upper_bound(key))
+            {
+              _group_map[key] = next;
+            }else
+            {
+              _group_map.erase(map_it);
+            }
+          }
+          return _list.erase(it);
+        }
+        void clear()
+        {
+          _list.clear();
+          _group_map.clear();
+        }
+      private:
+        /* Suppress default assignment operator, since it has the wrong semantics. */
+        grouped_list& operator=(const grouped_list &other);
+
+        bool weakly_equivalent(const group_key_type &arg1, const group_key_type &arg2)
+        {
+          if(_group_key_compare(arg1, arg2)) return false;
+          if(_group_key_compare(arg2, arg1)) return false;
+          return true;
+        }
+        void m_insert(const map_iterator &map_it, const group_key_type &key, const ValueType &value)
+        {
+          iterator list_it = get_list_iterator(map_it);
+          iterator new_it = _list.insert(list_it, value);
+          if(map_it != _group_map.end() && weakly_equivalent(key, map_it->first))
+          {
+            _group_map.erase(map_it);
+          }
+          map_iterator lower_bound_it = _group_map.lower_bound(key);
+          if(lower_bound_it == _group_map.end() ||
+            weakly_equivalent(lower_bound_it->first, key) == false)
+          {
+            /* doing the following instead of just
+              _group_map[key] = new_it;
+              to avoid bogus error when enabling checked iterators with g++ */
+            _group_map.insert(typename map_type::value_type(key, new_it));
+          }
+        }
+        iterator get_list_iterator(const const_map_iterator &map_it)
+        {
+          iterator list_it;
+          if(map_it == _group_map.end())
+          {
+            list_it = _list.end();
+          }else
+          {
+            list_it = map_it->second;
+          }
+          return list_it;
+        }
+        const_iterator get_list_iterator(const const_map_iterator &map_it) const
+        {
+          const_iterator list_it;
+          if(map_it == _group_map.end())
+          {
+            list_it = _list.end();
+          }else
+          {
+            list_it = map_it->second;
+          }
+          return list_it;
+        }
+
+        list_type _list;
+        // holds iterators to first list item in each group
+        map_type _group_map;
+        group_key_compare_type _group_key_compare;
+      };
+    } // end namespace detail
+    enum connect_position { at_back, at_front };
+  } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_SLOT_GROUPS_HPP

test/external/boost/signals2/detail/slot_template.hpp

@@ -0,0 +1,183 @@
+// Boost.Signals2 library
+
+// Copyright Frank Mori Hess 2007-2008.
+// Copyright Timmo Stange 2007.
+// Copyright Douglas Gregor 2001-2004. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+// This file is included iteratively, and should not be protected from multiple inclusion
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+#define BOOST_SIGNALS2_NUM_ARGS BOOST_PP_ITERATION()
+#else
+#define BOOST_SIGNALS2_NUM_ARGS 1
+#endif
+
+
+namespace boost
+{
+  namespace signals2
+  {
+    template<typename Signature, typename SlotFunction> class slot;
+
+    // slot class template.
+    template<BOOST_SIGNALS2_SIGNATURE_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS),
+      typename SlotFunction = BOOST_SIGNALS2_FUNCTION_N_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+      class BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+    template<BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION_DECL(BOOST_SIGNALS2_NUM_ARGS)>
+      class BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS) BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION
+      : public slot_base, public detail::BOOST_SIGNALS2_STD_FUNCTIONAL_BASE(R)
+
+    {
+    public:
+      template<BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS, Other), typename OtherSlotFunction>
+      friend class BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS);
+
+      typedef SlotFunction slot_function_type;
+      typedef R result_type;
+      typedef typename mpl::identity<BOOST_SIGNALS2_SIGNATURE_FUNCTION_TYPE(BOOST_SIGNALS2_NUM_ARGS)>::type signature_type;
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+
+// typedef Tn argn_type;
+#define BOOST_SIGNALS2_MISC_STATEMENT(z, n, data) \
+    typedef BOOST_PP_CAT(T, BOOST_PP_INC(n)) BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(n)), _type);
+          BOOST_PP_REPEAT(BOOST_SIGNALS2_NUM_ARGS, BOOST_SIGNALS2_MISC_STATEMENT, ~)
+#undef BOOST_SIGNALS2_MISC_STATEMENT
+#if BOOST_SIGNALS2_NUM_ARGS == 1
+      typedef arg1_type argument_type;
+#elif BOOST_SIGNALS2_NUM_ARGS == 2
+      typedef arg1_type first_argument_type;
+      typedef arg2_type second_argument_type;
+#endif
+
+      template<unsigned n> class arg : public
+        detail::BOOST_SIGNALS2_PREPROCESSED_ARG_N_TYPE_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <n BOOST_SIGNALS2_PP_COMMA_IF(BOOST_SIGNALS2_NUM_ARGS)
+        BOOST_SIGNALS2_ARGS_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS)>
+      {};
+
+      BOOST_STATIC_CONSTANT(int, arity = BOOST_SIGNALS2_NUM_ARGS);
+
+#else // BOOST_NO_VARIADIC_TEMPLATES
+
+      template<unsigned n> class arg
+      {
+      public:
+        typedef typename detail::variadic_arg_type<n, Args...>::type type;
+      };
+      BOOST_STATIC_CONSTANT(int, arity = sizeof...(Args));
+
+#endif // BOOST_NO_VARIADIC_TEMPLATES
+
+      template<typename F>
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)(const F& f)
+      {
+        init_slot_function(f);
+      }
+      // copy constructors
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+      template<BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_DECL(BOOST_SIGNALS2_NUM_ARGS, Other), typename OtherSlotFunction>
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)(const BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)
+        <BOOST_SIGNALS2_PREFIXED_SIGNATURE_TEMPLATE_INSTANTIATION(BOOST_SIGNALS2_NUM_ARGS, Other), OtherSlotFunction> &other_slot):
+        slot_base(other_slot), _slot_function(other_slot._slot_function)
+      {
+      }
+#endif
+      template<typename Signature, typename OtherSlotFunction>
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)(const slot<Signature, OtherSlotFunction> &other_slot):
+        slot_base(other_slot), _slot_function(other_slot._slot_function)
+      {
+      }
+      // bind syntactic sugar
+      BOOST_SIGNALS2_SLOT_N_BINDING_CONSTRUCTORS
+      // invocation
+      R operator()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS))
+      {
+        locked_container_type locked_objects = lock();
+        return _slot_function(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+      }
+      R operator()(BOOST_SIGNALS2_SIGNATURE_FULL_ARGS(BOOST_SIGNALS2_NUM_ARGS)) const
+      {
+        locked_container_type locked_objects = lock();
+        return _slot_function(BOOST_SIGNALS2_SIGNATURE_ARG_NAMES(BOOST_SIGNALS2_NUM_ARGS));
+      }
+      // tracking
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)& track(const weak_ptr<void> &tracked)      {
+        _tracked_objects.push_back(tracked);
+        return *this;
+      }
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)& track(const signal_base &signal)
+      {
+        track_signal(signal);
+        return *this;
+      }
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)& track(const slot_base &slot)
+      {
+        tracked_container_type::const_iterator it;
+        for(it = slot.tracked_objects().begin(); it != slot.tracked_objects().end(); ++it)
+        {
+          _tracked_objects.push_back(*it);
+        }
+        return *this;
+      }
+      template<typename ForeignWeakPtr>
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)& track_foreign(const ForeignWeakPtr &tracked,
+        typename weak_ptr_traits<ForeignWeakPtr>::shared_type * /*SFINAE*/ = 0)
+      {
+        _tracked_objects.push_back(detail::foreign_void_weak_ptr(tracked));
+        return *this;
+      }
+      template<typename ForeignSharedPtr>
+      BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)& track_foreign(const ForeignSharedPtr &tracked,
+        typename shared_ptr_traits<ForeignSharedPtr>::weak_type * /*SFINAE*/ = 0)
+      {
+        _tracked_objects.push_back
+        (
+          detail::foreign_void_weak_ptr
+          (
+            typename shared_ptr_traits<ForeignSharedPtr>::weak_type(tracked)
+          )
+        );
+        return *this;
+      }
+
+      const slot_function_type& slot_function() const {return _slot_function;}
+      slot_function_type& slot_function() {return _slot_function;}
+    private:
+      template<typename F>
+      void init_slot_function(const F& f)
+      {
+        _slot_function = detail::get_invocable_slot(f, detail::tag_type(f));
+        signals2::detail::tracked_objects_visitor visitor(this);
+        boost::visit_each(visitor, f);
+      }
+
+      SlotFunction _slot_function;
+    };
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+    namespace detail
+    {
+      template<unsigned arity, typename Signature, typename SlotFunction>
+      class slotN;
+      // partial template specialization
+      template<typename Signature, typename SlotFunction>
+      class slotN<BOOST_SIGNALS2_NUM_ARGS, Signature, SlotFunction>
+      {
+      public:
+        typedef BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS)<
+          BOOST_SIGNALS2_PORTABLE_SIGNATURE(BOOST_SIGNALS2_NUM_ARGS, Signature),
+          SlotFunction> type;
+      };
+    }
+#endif
+  } // end namespace signals2
+} // end namespace boost
+
+#undef BOOST_SIGNALS2_NUM_ARGS

test/external/boost/signals2/detail/tracked_objects_visitor.hpp

@@ -0,0 +1,98 @@
+// Boost.Signals2 library
+
+// Copyright Frank Mori Hess 2007-2008.
+// Copyright Timmo Stange 2007.
+// Copyright Douglas Gregor 2001-2004. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
+#define BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/ref.hpp>
+#include <boost/signals2/detail/signals_common.hpp>
+#include <boost/signals2/slot_base.hpp>
+#include <boost/signals2/trackable.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/is_pointer.hpp>
+#include <boost/type_traits/remove_pointer.hpp>
+#include <boost/utility/addressof.hpp>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      // Visitor to collect tracked objects from a bound function.
+      class tracked_objects_visitor
+      {
+      public:
+        tracked_objects_visitor(slot_base *slot) : slot_(slot)
+        {}
+        template<typename T>
+        void operator()(const T& t) const
+        {
+            m_visit_reference_wrapper(t, mpl::bool_<is_reference_wrapper<T>::value>());
+        }
+      private:
+        template<typename T>
+        void m_visit_reference_wrapper(const reference_wrapper<T> &t, const mpl::bool_<true> &) const
+        {
+            m_visit_pointer(t.get_pointer(), mpl::bool_<true>());
+        }
+        template<typename T>
+        void m_visit_reference_wrapper(const T &t, const mpl::bool_<false> &) const
+        {
+            m_visit_pointer(t, mpl::bool_<is_pointer<T>::value>());
+        }
+        template<typename T>
+        void m_visit_pointer(const T &t, const mpl::bool_<true> &) const
+        {
+            m_visit_not_function_pointer(t, mpl::bool_<!is_function<typename remove_pointer<T>::type>::value>());
+        }
+        template<typename T>
+        void m_visit_pointer(const T &t, const mpl::bool_<false> &) const
+        {
+            m_visit_pointer(boost::addressof(t), mpl::bool_<true>());
+        }
+        template<typename T>
+        void m_visit_not_function_pointer(const T *t, const mpl::bool_<true> &) const
+        {
+            m_visit_signal(t, mpl::bool_<is_signal<T>::value>());
+        }
+        template<typename T>
+        void m_visit_not_function_pointer(const T &, const mpl::bool_<false> &) const
+        {}
+        template<typename T>
+        void m_visit_signal(const T *signal, const mpl::bool_<true> &) const
+        {
+          if(signal)
+            slot_->track_signal(*signal);
+        }
+        template<typename T>
+        void m_visit_signal(const T &t, const mpl::bool_<false> &) const
+        {
+            add_if_trackable(t);
+        }
+        void add_if_trackable(const trackable *trackable) const
+        {
+          if(trackable)
+            slot_->_tracked_objects.push_back(trackable->get_shared_ptr());
+        }
+        void add_if_trackable(const void *) const {}
+
+        mutable slot_base * slot_;
+      };
+
+
+    } // end namespace detail
+  } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
+

test/external/boost/signals2/detail/unique_lock.hpp

@@ -0,0 +1,42 @@
+/*
+  Provides a basic subset of boost::unique_lock functionality.  Provided only because
+  including boost/thread/locks.hpp requires linking to thread library
+*/
+// Copyright Frank Mori Hess 2008.
+// Distributed under the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/signals2 for library home page.
+
+#ifndef BOOST_SIGNALS2_UNIQUE_LOCK_HPP
+#define BOOST_SIGNALS2_UNIQUE_LOCK_HPP
+
+#include <boost/noncopyable.hpp>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<typename Mutex>
+      class unique_lock: public noncopyable
+      {
+      public:
+        unique_lock(Mutex &m): _mutex(m)
+        {
+          _mutex.lock();
+        }
+        ~unique_lock()
+        {
+          _mutex.unlock();
+        }
+      private:
+        Mutex &_mutex;
+      };
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#endif  // BOOST_SIGNALS2_UNIQUE_LOCK_HPP

test/external/boost/signals2/detail/variadic_arg_type.hpp

@@ -0,0 +1,49 @@
+// Copyright Frank Mori Hess 2009
+//
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP
+#define BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP
+
+#include <functional>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<unsigned, typename ... Args> class variadic_arg_type;
+
+      template<typename T, typename ... Args> class variadic_arg_type<0, T, Args...>
+      {
+      public:
+        typedef T type;
+      };
+
+      template<unsigned n, typename T, typename ... Args> class variadic_arg_type<n, T, Args...>
+      {
+      public:
+        typedef typename variadic_arg_type<n - 1, Args...>::type type;
+      };
+
+      template <typename R, typename ... Args>
+        struct std_functional_base
+      {};
+      template <typename R, typename T1>
+        struct std_functional_base<R, T1>: public std::unary_function<T1, R>
+      {};
+      template <typename R, typename T1, typename T2>
+        struct std_functional_base<R, T1, T2>: public std::binary_function<T1, T2, R>
+      {};
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+
+#endif // BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP

test/external/boost/signals2/detail/variadic_slot_invoker.hpp

@@ -0,0 +1,123 @@
+/*
+  Helper class used by variadic implementation of variadic boost::signals2::signal.
+
+  Author: Frank Mori Hess <fmhess@users.sourceforge.net>
+  Begin: 2009-05-27
+*/
+// Copyright Frank Mori Hess 2009
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
+#define BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
+
+#include <boost/signals2/detail/variadic_arg_type.hpp>
+// if compiler has variadic template support, we assume they have
+// a variadic std::tuple implementation here.  We don't use boost::tuple
+// because it does not have variadic template support at present.
+#include <tuple>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<unsigned ... values> class unsigned_meta_array {};
+
+      template<typename UnsignedMetaArray, unsigned n> class unsigned_meta_array_appender;
+
+      template<unsigned n, unsigned ... Args>
+        class unsigned_meta_array_appender<unsigned_meta_array<Args...>, n>
+      {
+      public:
+        typedef unsigned_meta_array<Args..., n> type;
+      };
+
+      template<unsigned n> class make_unsigned_meta_array;
+
+      template<> class make_unsigned_meta_array<0>
+      {
+      public:
+        typedef unsigned_meta_array<> type;
+      };
+
+      template<> class make_unsigned_meta_array<1>
+      {
+      public:
+        typedef unsigned_meta_array<0> type;
+      };
+
+      template<unsigned n> class make_unsigned_meta_array
+      {
+      public:
+        typedef typename unsigned_meta_array_appender<typename make_unsigned_meta_array<n-1>::type, n - 1>::type type;
+      };
+
+      template<typename R>
+        class call_with_tuple_args
+      {
+      public:
+        typedef R result_type;
+
+        template<typename Func, typename ... Args>
+          R operator()(Func &func, std::tuple<Args...> args) const
+        {
+          typedef typename make_unsigned_meta_array<sizeof...(Args)>::type indices_type;
+          typename Func::result_type *resolver = 0;
+          return m_invoke(resolver, func, indices_type(), args);
+        }
+      private:
+        template<typename T, typename Func, unsigned ... indices, typename ... Args>
+          R m_invoke(T *, Func &func, unsigned_meta_array<indices...>, std::tuple<Args...> args) const
+        {
+          return func(std::get<indices>(args)...);
+        }
+        template<typename Func, unsigned ... indices, typename ... Args>
+          R m_invoke(void *, Func &func, unsigned_meta_array<indices...>, std::tuple<Args...> args) const
+        {
+          func(std::get<indices>(args)...);
+          return R();
+        }
+      };
+
+      template<typename R, typename ... Args>
+        class variadic_slot_invoker
+      {
+      public:
+        typedef R result_type;
+
+        variadic_slot_invoker(Args & ... args): _args(args...)
+        {}
+        template<typename ConnectionBodyType>
+          result_type operator ()(const ConnectionBodyType &connectionBody) const
+        {
+          result_type *resolver = 0;
+          return m_invoke(connectionBody,
+            resolver);
+        }
+      private:
+        template<typename ConnectionBodyType>
+        result_type m_invoke(const ConnectionBodyType &connectionBody,
+          const void_type *) const
+        {
+          return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
+          return void_type();
+        }
+        template<typename ConnectionBodyType>
+          result_type m_invoke(const ConnectionBodyType &connectionBody, ...) const
+        {
+          return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
+        }
+        std::tuple<Args& ...> _args;
+      };
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+
+#endif // BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP