Add tests for enable_shared_from

test/shared_from_test.cpp

@@ -0,0 +1,102 @@
+
+// shared_from_test.cpp
+//
+// Copyright 2019 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/smart_ptr/enable_shared_from.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+//
+
+class X
+{
+private:
+
+    int m_;
+
+public:
+
+    X(): m_() {}
+};
+
+class Y: public boost::enable_shared_from
+{
+};
+
+class Z: public X, public Y
+{
+public:
+
+    boost::shared_ptr<Z> shared_from_this()
+    {
+        return boost::shared_from( this );
+    }
+};
+
+void null_deleter( void const* )
+{
+}
+
+int main()
+{
+    boost::shared_ptr<Z> p( new Z );
+
+    try
+    {
+        boost::shared_ptr<Z> q = p->shared_from_this();
+
+        BOOST_TEST_EQ( p, q );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+    catch( boost::bad_weak_ptr const & )
+    {
+        BOOST_ERROR( "p->shared_from_this() failed" );
+    }
+
+    Z v2( *p );
+
+    try
+    {
+        boost::shared_ptr<Z> q = v2.shared_from_this();
+        BOOST_ERROR( "v2.shared_from_this() failed to throw" );
+    }
+    catch( boost::bad_weak_ptr const & )
+    {
+    }
+
+    *p = Z();
+
+    try
+    {
+        boost::shared_ptr<Z> q = p->shared_from_this();
+
+        BOOST_TEST_EQ( p, q );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+    catch( boost::bad_weak_ptr const & )
+    {
+        BOOST_ERROR( "p->shared_from_this() threw bad_weak_ptr after *p = Z()" );
+    }
+
+    {
+        boost::shared_ptr<Z> p2( p.get(), null_deleter );
+    }
+
+    try
+    {
+        boost::shared_ptr<Z> q = p->shared_from_this();
+
+        BOOST_TEST_EQ( p, q );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+    catch( boost::bad_weak_ptr const& )
+    {
+        BOOST_ERROR( "p->shared_from_this() failed" );
+    }
+
+    return boost::report_errors();
+}