Added boost header

test/external/boost/signals/detail/config.hpp

@@ -0,0 +1,54 @@
+/*
+ *
+ * Copyright (c) 1998-2002
+ * John Maddock
+ *
+ * Copyright (c) 2003-2004
+ * Douglas Gregor
+ *
+ * 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_SIGNALS_CONFIG_HPP
+#define BOOST_SIGNALS_CONFIG_HPP
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_HAS_DECLSPEC
+#  if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_SIGNALS_DYN_LINK)
+#    ifdef BOOST_SIGNALS_SOURCE
+#      define BOOST_SIGNALS_DECL __declspec(dllexport)
+#    else
+#      define BOOST_SIGNALS_DECL __declspec(dllimport)
+#    endif  // BOOST_SIGNALS_SOURCE
+#  endif  // DYN_LINK
+#endif  // BOOST_HAS_DECLSPEC
+
+#ifndef BOOST_SIGNALS_DECL
+#  define BOOST_SIGNALS_DECL
+#endif
+
+// Setup autolinking
+#if !defined(BOOST_SIGNALS_SOURCE) && !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_SIGNALS_NO_LIB)
+#  define BOOST_LIB_NAME boost_signals
+
+#  if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_SIGNALS_DYN_LINK)
+#    define BOOST_DYN_LINK
+#  endif
+
+#  include <boost/config/auto_link.hpp>
+#endif // autolinking on
+
+#endif // BOOST_SIGNALS_CONFIG_HPP
+
+
+
+
+
+
+
+
+

test/external/boost/signals/detail/gen_signal_N.pl

@@ -0,0 +1,132 @@
+#!/usr/bin/perl -w
+#
+# Boost.Signals library
+
+# Copyright Douglas Gregor 2001-2003. 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
+use English;
+
+if ($#ARGV < 0) {
+  print "Usage: perl gen_signal_N <number of arguments>\n";
+  exit;
+}
+
+
+$totalNumArgs = $ARGV[0];
+for ($numArgs = 0; $numArgs <= $totalNumArgs; ++$numArgs) {
+  open OUT, ">signal$numArgs.hpp";
+  print OUT "// Boost.Signals library\n";
+  print OUT "//\n";
+  print OUT "// Copyright (C) 2001 Doug Gregor (gregod\@cs.rpi.edu)\n";
+  print OUT "//\n";
+  print OUT "// Permission to copy, use, sell and distribute this software is granted\n";
+  print OUT "// provided this copyright notice appears in all copies.\n";
+  print OUT "// Permission to modify the code and to distribute modified code is granted\n";
+  print OUT "// provided this copyright notice appears in all copies, and a notice\n";
+  print OUT "// that the code was modified is included with the copyright notice.\n";
+  print OUT "//\n";
+  print OUT "// This software is provided \"as is\" without express or implied warranty,\n";
+  print OUT "// and with no claim as to its suitability for any purpose.\n";
+  print OUT " \n";
+  print OUT "// For more information, see http://www.boost.org\n";
+  print OUT "\n";
+  print OUT "#ifndef BOOST_SIGNALS_SIGNAL" . $numArgs . "_HEADER\n";
+  print OUT "#define BOOST_SIGNALS_SIGNAL" , $numArgs . "_HEADER\n";
+  print OUT "\n";
+  print OUT "#define BOOST_SIGNALS_NUM_ARGS $numArgs\n";
+
+  $templateParms = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $templateParms .= ", ";
+    }
+    $templateParms .= "typename T$i";
+  }
+  print OUT "#define BOOST_SIGNALS_TEMPLATE_PARMS $templateParms\n";
+
+  $_ = $templateParms;
+  s/typename //g;
+  $templateArgs = $_;
+  print OUT "#define BOOST_SIGNALS_TEMPLATE_ARGS $templateArgs\n";
+
+  $parms = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $parms .= ", ";
+    }
+    $parms .= "T$i a$i";
+  }
+  print OUT "#define BOOST_SIGNALS_PARMS $parms\n";
+
+  $args = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $args .= ", ";
+    }
+    $args .= "a$i";
+  }
+  print OUT "#define BOOST_SIGNALS_ARGS $args\n";
+
+  $boundArgs = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $boundArgs .= ", ";
+    }
+    $boundArgs .= "args->a$i";
+  }
+  print OUT "#define BOOST_SIGNALS_BOUND_ARGS $boundArgs\n";
+
+  $argsAsMembers = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    $argsAsMembers .= "T$i a$i;";
+  }
+  print OUT "#define BOOST_SIGNALS_ARGS_AS_MEMBERS $argsAsMembers\n";
+
+  $copyParms = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $copyParms .= ", ";
+    }
+    $copyParms .= "T$i ia$i";
+  }
+  print OUT "#define BOOST_SIGNALS_COPY_PARMS $copyParms\n";
+
+  $initArgs = "";
+  if ($numArgs > 0) {
+      $initArgs = ":";
+  }
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    if ($i > 1) {
+      $initArgs .= ", ";
+    }
+    $initArgs .= "a$i(ia$i)";
+  }
+  print OUT "#define BOOST_SIGNALS_INIT_ARGS $initArgs\n";
+
+  $argTypes = "";
+  for ($i = 1; $i <= $numArgs; ++$i) {
+    $argTypes .= "typedef T$i arg". ($i+1) . "_type; ";
+  }
+
+  print OUT "#define BOOST_SIGNALS_ARG_TYPES $argTypes\n";
+  print OUT "\n";
+  print OUT "#include <boost/signals/signal_template.hpp>\n";
+  print OUT "\n";
+  print OUT "#undef BOOST_SIGNALS_ARG_TYPES\n";
+  print OUT "#undef BOOST_SIGNALS_INIT_ARGS\n";
+  print OUT "#undef BOOST_SIGNALS_COPY_PARMS\n";
+  print OUT "#undef BOOST_SIGNALS_ARGS_AS_MEMBERS\n";
+  print OUT "#undef BOOST_SIGNALS_BOUND_ARGS\n";
+  print OUT "#undef BOOST_SIGNALS_ARGS\n";
+  print OUT "#undef BOOST_SIGNALS_PARMS\n";
+  print OUT "#undef BOOST_SIGNALS_TEMPLATE_ARGS\n";
+  print OUT "#undef BOOST_SIGNALS_TEMPLATE_PARMS\n";
+  print OUT "#undef BOOST_SIGNALS_NUM_ARGS\n";
+  print OUT "\n";
+  print OUT "#endif // BOOST_SIGNALS_SIGNAL" . $numArgs . "_HEADER\n";
+  close OUT;
+}

test/external/boost/signals/detail/named_slot_map.hpp

@@ -0,0 +1,193 @@
+// Boost.Signals library
+
+// 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_SIGNALS_NAMED_SLOT_MAP_HPP
+#define BOOST_SIGNALS_NAMED_SLOT_MAP_HPP
+
+#include <boost/signals/detail/config.hpp>
+#include <boost/signals/detail/signals_common.hpp>
+#include <boost/signals/connection.hpp>
+#include <boost/utility.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/function/function2.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+#include <map>
+#include <memory>
+#include <utility>
+
+namespace boost { namespace BOOST_SIGNALS_NAMESPACE {
+
+enum connect_position { at_back, at_front };
+
+namespace detail {
+
+class stored_group
+{
+ public:
+  enum storage_kind { sk_empty, sk_front, sk_back, sk_group };
+
+  stored_group(storage_kind p_kind = sk_empty) : kind(p_kind), group() { }
+
+  template<typename T>
+  stored_group(const T& p_group) : kind(sk_group), group(new T(p_group)) { }
+
+  bool is_front() const { return kind == sk_front; }
+  bool is_back() const { return kind == sk_back; }
+  bool empty() const { return kind == sk_empty; }
+
+  void* get() const { return group.get(); }
+
+ private:
+  storage_kind kind;
+  shared_ptr<void> group;
+};
+
+typedef function2<bool, stored_group, stored_group> compare_type;
+
+// This function object bridges from a pair of any objects that hold
+// values of type Key to the underlying function object that compares
+// values of type Key.
+template<typename Compare, typename Key>
+class group_bridge_compare {
+public:
+  typedef bool result_type;
+  typedef const stored_group& first_argument_type;
+  typedef const stored_group& second_argument_type;
+
+  group_bridge_compare(const Compare& c) : comp(c) 
+  { }
+
+  bool operator()(const stored_group& k1, const stored_group& k2) const
+  {
+    if (k1.is_front()) return !k2.is_front();
+    if (k1.is_back()) return false;
+    if (k2.is_front()) return false;
+    if (k2.is_back()) return true;
+
+    // Neither is empty, so compare their values to order them
+    return comp(*static_cast<Key*>(k1.get()), *static_cast<Key*>(k2.get()));
+  }
+
+private:
+  Compare comp;
+};
+
+class BOOST_SIGNALS_DECL named_slot_map_iterator :
+  public iterator_facade<named_slot_map_iterator,
+                         connection_slot_pair,
+                         forward_traversal_tag>
+{
+  typedef std::list<connection_slot_pair> group_list;
+  typedef group_list::iterator slot_pair_iterator;
+  typedef std::map<stored_group, group_list, compare_type> slot_container_type;
+  typedef slot_container_type::iterator group_iterator;
+  typedef slot_container_type::const_iterator const_group_iterator;
+
+  typedef iterator_facade<named_slot_map_iterator,
+                          connection_slot_pair,
+                          forward_traversal_tag> inherited;
+public:
+  named_slot_map_iterator() : slot_assigned(false) 
+  { }
+  named_slot_map_iterator(const named_slot_map_iterator& other) 
+    : group(other.group), last_group(other.last_group),
+    slot_assigned(other.slot_assigned)
+  {
+    if (slot_assigned) slot_ = other.slot_;
+  }
+  named_slot_map_iterator& operator=(const named_slot_map_iterator& other) 
+  {
+    slot_assigned = other.slot_assigned;
+    group = other.group;
+    last_group = other.last_group;
+    if (slot_assigned) slot_ = other.slot_;
+    return *this;
+  }
+  connection_slot_pair& dereference() const 
+  {
+    return *slot_;
+  }
+  void increment() 
+  {
+    ++slot_;
+    if (slot_ == group->second.end()) {
+      ++group;
+      init_next_group();
+    }
+  }
+  bool equal(const named_slot_map_iterator& other) const {
+    return (group == other.group
+        && (group == last_group
+        || slot_ == other.slot_));
+  }
+
+#if BOOST_WORKAROUND(_MSC_VER, <= 1600)
+  void decrement();
+  void advance(difference_type);
+#endif
+
+private:
+  named_slot_map_iterator(group_iterator giter, group_iterator last) :
+    group(giter), last_group(last), slot_assigned(false)
+  { init_next_group(); }
+  named_slot_map_iterator(group_iterator giter, group_iterator last,
+                          slot_pair_iterator slot) :
+    group(giter), last_group(last), slot_(slot), slot_assigned(true)
+  { }
+
+  void init_next_group()
+  {
+    while (group != last_group && group->second.empty()) ++group;
+    if (group != last_group) {
+      slot_ = group->second.begin();
+      slot_assigned = true;
+    }
+  }
+
+  group_iterator group;
+  group_iterator last_group;
+  slot_pair_iterator slot_;
+  bool slot_assigned;
+
+  friend class named_slot_map;
+};
+
+class BOOST_SIGNALS_DECL named_slot_map
+{
+public:
+  typedef named_slot_map_iterator iterator;
+
+  named_slot_map(const compare_type& compare);
+
+  void clear();
+  iterator begin();
+  iterator end();
+  iterator insert(const stored_group& name, const connection& con,
+                  const any& slot, connect_position at);
+  void disconnect(const stored_group& name);
+  void erase(iterator pos);
+  void remove_disconnected_slots();
+
+private:
+  typedef std::list<connection_slot_pair> group_list;
+  typedef std::map<stored_group, group_list, compare_type> slot_container_type;
+  typedef slot_container_type::iterator group_iterator;
+  typedef slot_container_type::const_iterator const_group_iterator;
+
+  bool empty(const_group_iterator group) const
+  {
+    return (group->second.empty() && group != groups.begin() && group != back);
+  }
+  slot_container_type groups;
+  group_iterator back;
+};
+
+} } }
+
+#endif // BOOST_SIGNALS_NAMED_SLOT_MAP_HPP

test/external/boost/signals/detail/signal_base.hpp

@@ -0,0 +1,159 @@
+// Boost.Signals library
+
+// 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_SIGNALS_SIGNAL_BASE_HEADER
+#define BOOST_SIGNALS_SIGNAL_BASE_HEADER
+
+#include <boost/signals/detail/config.hpp>
+#include <boost/signals/detail/signals_common.hpp>
+#include <boost/signals/detail/named_slot_map.hpp>
+#include <boost/signals/connection.hpp>
+#include <boost/signals/trackable.hpp>
+#include <boost/signals/slot.hpp>
+#include <boost/smart_ptr.hpp>
+#include <boost/utility.hpp>
+#include <boost/function/function2.hpp>
+#include <utility>
+#include <vector>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+  namespace BOOST_SIGNALS_NAMESPACE {
+    namespace detail {
+      // Must be constructed before calling the slots, because it safely
+      // manages call depth
+      class BOOST_SIGNALS_DECL call_notification {
+      public:
+        call_notification(const shared_ptr<signal_base_impl>&);
+        ~call_notification();
+
+        shared_ptr<signal_base_impl> impl;
+      };
+
+      // Implementation of base class for all signals. It handles the
+      // management of the underlying slot lists.
+      class BOOST_SIGNALS_DECL signal_base_impl {
+      public:
+        friend class call_notification;
+
+        typedef function2<bool, stored_group, stored_group> compare_type;
+
+        // Make sure that an exception does not cause the "clearing" flag to
+        // remain set
+        class temporarily_set_clearing {
+        public:
+          temporarily_set_clearing(signal_base_impl* b) : base(b)
+          {
+            base->flags.clearing = true;
+          }
+
+          ~temporarily_set_clearing()
+          {
+            base->flags.clearing = false;
+          }
+
+        private:
+          signal_base_impl* base;
+        };
+
+        friend class temporarily_set_clearing;
+
+        signal_base_impl(const compare_type&, const any&);
+        ~signal_base_impl();
+
+        // Disconnect all slots connected to this signal
+        void disconnect_all_slots();
+
+        // Are there any connected slots?
+        bool empty() const;
+
+        // The number of connected slots
+        std::size_t num_slots() const;
+
+        // Disconnect all slots in the given group
+        void disconnect(const stored_group&);
+
+        // We're being notified that a slot has disconnected
+        static void slot_disconnected(void* obj, void* data);
+
+        connection connect_slot(const any& slot,
+                                const stored_group& name,
+                                shared_ptr<slot_base::data_t> data,
+                                connect_position at);
+
+      private:
+        // Remove all of the slots that have been marked "disconnected"
+        void remove_disconnected_slots() const;
+
+      public:
+        // Our call depth when invoking slots (> 1 when we have a loop)
+        mutable int call_depth;
+
+        struct {
+          // True if some slots have disconnected, but we were not able to
+          // remove them from the list of slots because there are valid
+          // iterators into the slot list
+          mutable bool delayed_disconnect:1;
+
+          // True if we are disconnecting all disconnected slots
+          bool clearing:1;
+        } flags;
+
+        // Slots
+        mutable named_slot_map slots_;
+        any combiner_;
+
+        // Types
+        typedef named_slot_map::iterator iterator;
+      };
+
+      class BOOST_SIGNALS_DECL signal_base : public noncopyable {
+      public:
+        typedef signal_base_impl::compare_type compare_type;
+
+        friend class call_notification;
+
+        signal_base(const compare_type& comp, const any& combiner);
+        ~signal_base();
+
+      public:
+        // Disconnect all slots connected to this signal
+        void disconnect_all_slots() { impl->disconnect_all_slots(); }
+
+        // Are there any connected slots?
+        bool empty() const { return impl->empty(); }
+
+        // How many slots are connected?
+        std::size_t num_slots() const { return impl->num_slots(); }
+
+      protected:
+        connection connect_slot(const any& slot,
+                                const stored_group& name,
+                                shared_ptr<slot_base::data_t> data,
+                                connect_position at)
+        {
+          return impl->connect_slot(slot, name, data, at);
+        }
+
+        typedef named_slot_map::iterator iterator;
+
+        shared_ptr<signal_base_impl> impl;
+      };
+    } // end namespace detail
+  } // end namespace BOOST_SIGNALS_NAMESPACE
+} // end namespace boost
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_SIGNALS_SIGNAL_BASE_HEADER

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

@@ -0,0 +1,162 @@
+// Boost.Signals library
+
+// 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_SIGNALS_COMMON_HEADER
+#define BOOST_SIGNALS_COMMON_HEADER
+
+#ifndef BOOST_SIGNALS_NAMESPACE
+#  define BOOST_SIGNALS_NAMESPACE signals
+#endif
+
+#include <boost/type_traits/conversion_traits.hpp>
+#include <boost/ref.hpp>
+#include <boost/signals/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+  namespace BOOST_SIGNALS_NAMESPACE {
+    namespace detail {
+      // The unusable class is a placeholder for unused function arguments
+      // It is also completely unusable except that it constructable from
+      // anything. This helps compilers without partial specialization
+      // handle slots returning void.
+      struct unusable {
+        unusable() {}
+      };
+
+      // Determine the result type of a slot call
+      template<typename R>
+      struct slot_result_type {
+        typedef R type;
+      };
+
+      template<>
+      struct slot_result_type<void> {
+        typedef unusable type;
+      };
+
+      // Determine if the given type T is a signal
+      class signal_base;
+
+      template<typename T>
+      struct is_signal {
+        BOOST_STATIC_CONSTANT(bool,
+          value = (is_convertible<T*, signal_base*>::value));
+      };
+
+      /*
+       * The IF implementation is temporary code. When a Boost metaprogramming
+       * library is introduced, Boost.Signals will use it instead.
+       */
+      namespace intimate {
+        struct SelectThen
+        {
+          template<typename Then, typename Else>
+          struct Result
+          {
+            typedef Then type;
+          };
+        };
+
+        struct SelectElse
+        {
+          template<typename Then, typename Else>
+          struct Result
+          {
+            typedef Else type;
+          };
+        };
+
+        template<bool Condition>
+        struct Selector
+        {
+          typedef SelectThen type;
+        };
+
+        template<>
+        struct Selector<false>
+        {
+          typedef SelectElse type;
+        };
+      } // end namespace intimate
+
+      template<bool Condition, typename Then, typename Else>
+      struct IF
+      {
+        typedef typename intimate::Selector<Condition>::type select;
+        typedef typename select::template Result<Then,Else>::type type;
+      };
+
+      // Determine if the incoming argument is a reference_wrapper
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+      template<typename T>
+      struct is_ref
+      {
+        BOOST_STATIC_CONSTANT(bool, value = false);
+      };
+
+      template<typename T>
+      struct is_ref<reference_wrapper<T> >
+      {
+        BOOST_STATIC_CONSTANT(bool, value = true);
+      };
+#else // no partial specialization
+      typedef char yes_type;
+      typedef double no_type;
+
+      no_type is_ref_tester(...);
+
+      template<typename T>
+      yes_type is_ref_tester(reference_wrapper<T>*);
+
+      template<typename T>
+      struct is_ref
+      {
+        static T* t;
+        BOOST_STATIC_CONSTANT(bool,
+          value = (sizeof(is_ref_tester(t)) == sizeof(yes_type)));
+      };
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+      // 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 IF<(is_signal<S>::value),
+                            signal_tag,
+                            value_tag>::type signal_or_value;
+
+      public:
+        typedef typename IF<(is_ref<S>::value),
+                            reference_tag,
+                            signal_or_value>::type type;
+      };
+
+      // Forward declaration needed in lots of places
+      class signal_base_impl;
+      class bound_objects_visitor;
+      class slot_base;
+    } // end namespace detail
+  } // end namespace BOOST_SIGNALS_NAMESPACE
+} // end namespace boost
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_SIGNALS_COMMON_HEADER

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

@@ -0,0 +1,95 @@
+// Boost.Signals library
+
+// 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_SIGNALS_SLOT_CALL_ITERATOR
+#define BOOST_SIGNALS_SLOT_CALL_ITERATOR
+
+#include <memory>
+#include <boost/iterator/iterator_facade.hpp>
+#include <boost/smart_ptr.hpp>
+#include <boost/signals/detail/config.hpp>
+#include <boost/signals/connection.hpp>
+#include <boost/optional.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+  namespace BOOST_SIGNALS_NAMESPACE {
+    namespace detail {
+
+      // 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>
+      class slot_call_iterator
+        : public iterator_facade<slot_call_iterator<Function, Iterator>,
+                                 typename Function::result_type,
+                                 single_pass_traversal_tag,
+                                 typename Function::result_type const&>
+      {
+        typedef iterator_facade<slot_call_iterator<Function, Iterator>,
+                                typename Function::result_type,
+                                single_pass_traversal_tag,
+                                typename Function::result_type const&>
+          inherited;
+
+        typedef typename Function::result_type result_type;
+
+        friend class iterator_core_access;
+
+      public:
+        slot_call_iterator(Iterator iter_in, Iterator end_in, Function func,
+                           optional<result_type> &c)
+          : iter(iter_in), end(end_in), f(func), cache(&c)
+        {
+          iter = std::find_if(iter, end, is_callable());
+        }
+
+        typename inherited::reference
+        dereference() const
+        {
+          if (!cache->is_initialized()) {
+            cache->reset(f(*iter));
+          }
+
+          return cache->get();
+        }
+
+        void increment()
+        {
+          iter = std::find_if(++iter, end, is_callable());
+          cache->reset();
+        }
+
+        bool equal(const slot_call_iterator& other) const
+        {
+          iter = std::find_if(iter, end, is_callable());
+          other.iter = std::find_if(other.iter, other.end,
+                                    is_callable());
+          return iter == other.iter;
+        }
+
+      private:
+        mutable Iterator iter;
+        Iterator end;
+        Function f;
+        optional<result_type>* cache;
+      };
+    } // end namespace detail
+  } // end namespace BOOST_SIGNALS_NAMESPACE
+} // end namespace boost
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_SIGNALS_SLOT_CALL_ITERATOR