Add an additional weak_from_raw test.

test/Jamfile.v2

@@ -173,6 +173,7 @@ import testing ;
           [ run weak_from_raw_test2.cpp ]
           [ run weak_from_raw_test3.cpp ]
           [ run weak_from_raw_test4.cpp ]
+          [ run weak_from_raw_test5.cpp ]
 
           [ compile sp_explicit_inst_test.cpp ]
 

test/weak_from_raw_test5.cpp

@@ -0,0 +1,45 @@
+//
+//  weak_from_raw_test4.cpp
+//
+//  Tests whether pointers returned from weak_from_raw
+//  expire properly
+//
+//  Copyright 2015 Peter Dimov
+//
+//  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
+//
+
+#include <boost/smart_ptr/enable_shared_from_raw.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+class X: public boost::enable_shared_from_raw
+{
+public:
+
+    explicit X( boost::weak_ptr< X > & r )
+    {
+        r = boost::weak_from_raw( this );
+    }
+};
+
+int main()
+{
+    boost::weak_ptr<X> p1, p2;
+
+    {
+        boost::shared_ptr< X > px( new X( p1 ) );
+        p2 = boost::weak_from_raw( px.get() );
+
+        BOOST_TEST( !p1.expired() );
+        BOOST_TEST( !p2.expired() );
+    }
+
+    BOOST_TEST( p1.expired() );
+    BOOST_TEST( p2.expired() );
+
+    return boost::report_errors();
+}