Add tests for enable_shared_from

test/Jamfile

@@ -315,3 +315,7 @@ run sp_typeinfo_test.cpp : : : <rtti>off : sp_typeinfo_test_no_rtti ;
 run get_deleter_test.cpp : : : <rtti>off <toolset>gcc-4.4.7,<cxxstd>0x:<build>no : get_deleter_test_no_rtti ;
 run get_deleter_test2.cpp : : : <rtti>off <toolset>gcc-4.4.7,<cxxstd>0x:<build>no : get_deleter_test2_no_rtti ;
 run get_deleter_test3.cpp : : : <rtti>off <toolset>gcc-4.4.7,<cxxstd>0x:<build>no : get_deleter_test3_no_rtti ;
+
+run shared_from_test.cpp ;
+run weak_from_test.cpp ;
+run weak_from_test2.cpp ;

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();
+}

test/weak_from_test.cpp

@@ -0,0 +1,97 @@
+
+// weak_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/weak_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::weak_ptr<Z> weak_from_this()
+    {
+        return boost::weak_from( this );
+    }
+};
+
+void null_deleter( void const* )
+{
+}
+
+int main()
+{
+    boost::shared_ptr<Z> sp( new Z );
+    boost::weak_ptr<Z> p( sp );
+
+    {
+        boost::weak_ptr<Z> q = sp->weak_from_this();
+
+        BOOST_TEST_EQ( p.lock(), q.lock() );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+
+    Z v2( *sp );
+
+    {
+        boost::weak_ptr<Z> q = v2.weak_from_this();
+        BOOST_TEST( q.expired() );
+    }
+
+    *sp = Z();
+
+    {
+        boost::weak_ptr<Z> q = sp->weak_from_this();
+
+        BOOST_TEST_EQ( p.lock(), q.lock() );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+
+    {
+        boost::shared_ptr<Z> sp2( sp.get(), null_deleter );
+    }
+
+    {
+        boost::weak_ptr<Z> q = sp->weak_from_this();
+
+        BOOST_TEST_EQ( p.lock(), q.lock() );
+        BOOST_TEST( !( p < q ) && !( q < p ) );
+    }
+
+    {
+        boost::weak_ptr<Z> p2 = sp->weak_from_this();
+
+        BOOST_TEST( !p.expired() );
+        BOOST_TEST( !p2.expired() );
+
+        sp.reset();
+
+        BOOST_TEST( p.expired() );
+        BOOST_TEST( p2.expired() );
+    }
+
+    return boost::report_errors();
+}

test/weak_from_test2.cpp

@@ -0,0 +1,57 @@
+
+//  weak_from_test2.cpp
+//
+//  Tests weak_from in a destructor
+//
+//  Copyright 2014, 2015, 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/weak_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+class X: public boost::enable_shared_from
+{
+private:
+
+    boost::weak_ptr<X> px_;
+
+public:
+
+    X()
+    {
+        boost::weak_ptr<X> p1 = weak_from( this );
+        BOOST_TEST( p1._empty() );
+        BOOST_TEST( p1.expired() );
+    }
+
+    void check()
+    {
+        boost::weak_ptr<X> p2 = weak_from( this );
+        BOOST_TEST( !p2.expired() );
+
+        BOOST_TEST( p2.lock().get() == this );
+
+        px_ = p2;
+    }
+
+    ~X()
+    {
+        boost::weak_ptr<X> p3 = weak_from( this );
+        BOOST_TEST( p3.expired() );
+
+        BOOST_TEST( !(px_ < p3) && !(p3 < px_) );
+    }
+};
+
+int main()
+{
+    {
+        boost::shared_ptr< X > px( new X );
+        px->check();
+    }
+
+    return boost::report_errors();
+}