Merge [51643] to release. Fixes #2813.

[SVN r51688]

test/sp_recursive_assign_test.cpp

@@ -0,0 +1,122 @@
+//
+//  sp_recursive_assign_test.cpp
+//
+//  Copyright 2009 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/shared_ptr.hpp>
+#include <boost/detail/lightweight_test.hpp>
+
+//
+
+class X
+{
+public:
+
+    static int instances;
+
+    X()
+    {
+        ++instances;
+    }
+
+    ~X()
+    {
+        --instances;
+    }
+
+private:
+
+    X( X const& );
+};
+
+int X::instances = 0;
+
+class Y
+{
+public:
+
+    static int instances;
+
+    Y()
+    {
+        ++instances;
+    }
+
+    ~Y()
+    {
+        --instances;
+    }
+
+private:
+
+    Y( Y const& );
+};
+
+int Y::instances = 0;
+
+static boost::shared_ptr<void> s_pv;
+
+class Z
+{
+public:
+
+    static int instances;
+
+    Z()
+    {
+        ++instances;
+    }
+
+    ~Z()
+    {
+        --instances;
+
+        boost::shared_ptr<void> pv( new Y );
+        s_pv = pv;
+    }
+
+private:
+
+    Z( Z const& );
+};
+
+int Z::instances = 0;
+
+int main()
+{
+    BOOST_TEST( X::instances == 0 );
+    BOOST_TEST( Y::instances == 0 );
+    BOOST_TEST( Z::instances == 0 );
+
+    {
+        boost::shared_ptr<void> pv( new Z );
+        s_pv = pv;
+    }
+
+    BOOST_TEST( X::instances == 0 );
+    BOOST_TEST( Y::instances == 0 );
+    BOOST_TEST( Z::instances == 1 );
+
+    {
+        boost::shared_ptr<void> pv( new X );
+        s_pv = pv;
+    }
+
+    BOOST_TEST( X::instances == 0 );
+    BOOST_TEST( Y::instances == 1 );
+    BOOST_TEST( Z::instances == 0 );
+
+    s_pv.reset();
+
+    BOOST_TEST( X::instances == 0 );
+    BOOST_TEST( Y::instances == 0 );
+    BOOST_TEST( Z::instances == 0 );
+
+    return boost::report_errors();
+}