Added shared_ptr aliasing move constructor.

Signed-off-by: Gavin Lambert <github@mirality.co.nz>
2015-10-12 18:19:22 +13:00
parent df90496583
commit 05d5a4e9a0
4 changed files with 126 additions and 0 deletions
@@ -0,0 +1,105 @@
+#include <boost/config.hpp>
+
+//  shared_ptr_alias_move_test.cpp
+//
+//  Copyright (c) 2007 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/detail/lightweight_test.hpp>
+#include <boost/shared_ptr.hpp>
+#include <utility>
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+struct X
+{
+    static long instances;
+
+    int v_;
+
+    explicit X( int v ): v_( v )
+    {
+        ++instances;
+    }
+
+    ~X()
+    {
+        v_ = 0;
+        --instances;
+    }
+
+private:
+    X( X const & );
+    X & operator=( X const & );
+};
+
+long X::instances = 0;
+
+int main()
+{
+    BOOST_TEST( X::instances == 0 );
+
+    {
+        boost::shared_ptr< X > p( new X( 5 ) );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.unique() );
+        BOOST_TEST( p->v_ == 5 );
+
+        boost::shared_ptr< X > p2( std::move( p ), p.get() );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.get() == 0 );
+        BOOST_TEST( p2.unique() );
+        BOOST_TEST( p2->v_ == 5 );
+
+        boost::shared_ptr< int const > p3( std::move( p2 ), &p2->v_ );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p2.get() == 0 );
+        BOOST_TEST( p3.unique() );
+        BOOST_TEST( *p3 == 5 );
+
+        p3.reset();
+        BOOST_TEST( X::instances == 0 );
+    }
+
+    {
+        boost::shared_ptr< X > p( new X( 5 ) );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.unique() );
+        BOOST_TEST( p->v_ == 5 );
+
+        {
+            boost::shared_ptr< X > p2(p);
+            BOOST_TEST( X::instances == 1 );
+            BOOST_TEST( p.get() == p2.get() );
+            BOOST_TEST( p.use_count() == 2 );
+            BOOST_TEST( p2.use_count() == 2 );
+
+            boost::shared_ptr< int const > p3( std::move( p2 ), &p2->v_ );
+            BOOST_TEST( X::instances == 1 );
+            BOOST_TEST( p.use_count() == 2 );
+            BOOST_TEST( p2.use_count() == 0 );
+            BOOST_TEST( p2.get() == 0 );
+            BOOST_TEST( p3.use_count() == 2 );
+            BOOST_TEST( p3.get() == &p->v_ );
+        }
+
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.unique() );
+        BOOST_TEST( p->v_ == 5 );
+    }
+
+    return boost::report_errors();
+}
+
+#else // defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+int main()
+{
+    return 0;
+}
+
+#endif