Major changes to shared_ptr and weak_ptr

[SVN r16314]

include/boost/enable_shared_from_this.hpp

@@ -0,0 +1,51 @@
+#ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
+#define BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
+
+//
+//  enable_shared_from_this.hpp
+//
+//  Copyright (c) 2002 Peter Dimov
+//
+//  Permission to copy, use, modify, sell and distribute this software
+//  is granted provided this copyright notice appears in all copies.
+//  This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+//
+//  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
+//
+
+#include <boost/config.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+
+namespace boost
+{
+
+template<class T> class enable_shared_from_this
+{
+public:
+
+    shared_ptr<T> shared_from_this()
+    {
+        return shared_ptr<T>(weak_this);
+    }
+
+    shared_ptr<T const> shared_from_this() const
+    {
+        return shared_ptr<T const>(weak_this);
+    }
+
+#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
+
+private:
+
+    template<class Y> friend class shared_ptr;
+
+#endif
+
+    weak_ptr<T> weak_this;
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED