Added boost header

test/external/boost/signals2/slot_base.hpp

@@ -0,0 +1,101 @@
+// 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_SLOT_BASE_HPP
+#define BOOST_SIGNALS2_SLOT_BASE_HPP
+
+#include <boost/any.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/signals2/detail/foreign_ptr.hpp>
+#include <boost/signals2/expired_slot.hpp>
+#include <boost/signals2/signal_base.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/variant/variant.hpp>
+#include <vector>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      class tracked_objects_visitor;
+
+      typedef boost::variant<boost::weak_ptr<void>, detail::foreign_void_weak_ptr > void_weak_ptr_variant;
+      typedef boost::variant<boost::shared_ptr<void>, detail::foreign_void_shared_ptr > void_shared_ptr_variant;
+      class lock_weak_ptr_visitor
+      {
+      public:
+        typedef void_shared_ptr_variant result_type;
+        template<typename WeakPtr>
+        result_type operator()(const WeakPtr &wp) const
+        {
+          return wp.lock();
+        }
+      };
+      class expired_weak_ptr_visitor
+      {
+      public:
+        typedef bool result_type;
+        template<typename WeakPtr>
+        bool operator()(const WeakPtr &wp) const
+        {
+          return wp.expired();
+        }
+      };
+    }
+
+    class slot_base
+    {
+    public:
+      typedef std::vector<detail::void_weak_ptr_variant> tracked_container_type;
+      typedef std::vector<detail::void_shared_ptr_variant> locked_container_type;
+
+      const tracked_container_type& tracked_objects() const {return _tracked_objects;}
+      locked_container_type lock() const
+      {
+        locked_container_type locked_objects;
+        tracked_container_type::const_iterator it;
+        for(it = tracked_objects().begin(); it != tracked_objects().end(); ++it)
+        {
+          locked_objects.push_back(apply_visitor(detail::lock_weak_ptr_visitor(), *it));
+          if(apply_visitor(detail::expired_weak_ptr_visitor(), *it))
+          {
+            boost::throw_exception(expired_slot());
+          }
+        }
+        return locked_objects;
+      }
+      bool expired() const
+      {
+        tracked_container_type::const_iterator it;
+        for(it = tracked_objects().begin(); it != tracked_objects().end(); ++it)
+        {
+          if(apply_visitor(detail::expired_weak_ptr_visitor(), *it)) return true;
+        }
+        return false;
+      }
+    protected:
+      friend class detail::tracked_objects_visitor;
+
+      void track_signal(const signal_base &signal)
+      {
+        _tracked_objects.push_back(signal.lock_pimpl());
+      }
+
+      tracked_container_type _tracked_objects;
+    };
+  }
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_SLOT_BASE_HPP