Added boost header

test/external/boost/signals2/predestructible.hpp

@@ -0,0 +1,46 @@
+// DEPRECATED in favor of adl_predestruct with deconstruct<T>().
+// A simple framework for creating objects with predestructors.
+// The objects must inherit from boost::signals2::predestructible, and
+// have their lifetimes managed by
+// boost::shared_ptr created with the boost::signals2::deconstruct_ptr()
+// function.
+//
+// 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_PREDESTRUCTIBLE_HPP
+#define BOOST_SIGNALS2_PREDESTRUCTIBLE_HPP
+
+namespace boost
+{
+  namespace signals2
+  {
+    template<typename T> class predestructing_deleter;
+
+    namespace predestructible_adl_barrier
+    {
+      class predestructible
+      {
+      protected:
+        predestructible() {}
+      public:
+        template<typename T>
+          friend void adl_postconstruct(const shared_ptr<T> &, ...)
+        {}
+        friend void adl_predestruct(predestructible *p)
+        {
+          p->predestruct();
+        }
+        virtual ~predestructible() {}
+        virtual void predestruct() = 0;
+      };
+    } // namespace predestructible_adl_barrier
+    using predestructible_adl_barrier::predestructible;
+  }
+}
+
+#endif // BOOST_SIGNALS2_PREDESTRUCTIBLE_HPP