Add owner_hash

include/boost/smart_ptr/owner_hash.hpp

@@ -0,0 +1,27 @@
+#ifndef BOOST_SMART_PTR_OWNER_HASH_HPP_INCLUDED
+#define BOOST_SMART_PTR_OWNER_HASH_HPP_INCLUDED
+
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config.hpp>
+#include <cstddef>
+
+namespace boost
+{
+
+template<class T> struct owner_hash
+{
+    typedef std::size_t result_type;
+    typedef T argument_type;
+
+    std::size_t operator()( T const & t ) const BOOST_NOEXCEPT
+    {
+        return t.owner_hash_value();
+    }
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_OWNER_HASH_HPP_INCLUDED

test/Jamfile

@@ -405,3 +405,5 @@ run wp_hash_test.cpp ;
 run wp_hash_test2.cpp ;
 
 run wp_unordered_test.cpp ;
+
+run owner_hash_test.cpp ;

test/owner_hash_test.cpp

@@ -0,0 +1,88 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/smart_ptr/owner_hash.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T> std::size_t hash( T const& t )
+{
+    return boost::owner_hash<T>()( t );
+}
+
+int main()
+{
+    boost::shared_ptr<int> p1( new int );
+    boost::shared_ptr<int> p2( p1 );
+
+    BOOST_TEST_EQ( hash( p1 ), hash( p2 ) );
+
+    boost::shared_ptr<int> p3( new int );
+
+    BOOST_TEST_NE( hash( p1 ), hash( p3 ) );
+
+    boost::shared_ptr<int> p4;
+    boost::shared_ptr<int> p5;
+
+    BOOST_TEST_EQ( hash( p4 ), hash( p5 ) );
+    BOOST_TEST_NE( hash( p4 ), hash( p3 ) );
+
+    boost::shared_ptr<int> p6( static_cast<int*>(0) );
+
+    BOOST_TEST_NE( hash( p4 ), hash( p6 ) );
+
+    boost::shared_ptr<void> p7( p1 );
+
+    BOOST_TEST_EQ( hash( p1 ), hash( p7 ) );
+
+    boost::shared_ptr<void> p8;
+
+    BOOST_TEST_NE( hash( p1 ), hash( p8 ) );
+    BOOST_TEST_EQ( hash( p4 ), hash( p8 ) );
+
+    boost::weak_ptr<int> q1( p1 );
+
+    BOOST_TEST_EQ( hash( p1 ), hash( q1 ) );
+
+    boost::weak_ptr<int> q2( p1 );
+
+    BOOST_TEST_EQ( hash( q1 ), hash( q2 ) );
+
+    boost::weak_ptr<int> q3( p3 );
+
+    BOOST_TEST_NE( hash( p1 ), hash( q3 ) );
+    BOOST_TEST_NE( hash( q1 ), hash( q3 ) );
+
+    boost::weak_ptr<int> q4;
+
+    BOOST_TEST_EQ( hash( p4 ), hash( q4 ) );
+    BOOST_TEST_NE( hash( q1 ), hash( q4 ) );
+
+    boost::weak_ptr<void> q5;
+
+    BOOST_TEST_EQ( hash( q4 ), hash( q5 ) );
+
+    boost::weak_ptr<void> q7( p7 );
+
+    BOOST_TEST_EQ( hash( p1 ), hash( q7 ) );
+    BOOST_TEST_EQ( hash( q1 ), hash( q7 ) );
+
+    p1.reset();
+    p2.reset();
+    p3.reset();
+    p7.reset();
+
+    BOOST_TEST( q1.expired() );
+    BOOST_TEST( q2.expired() );
+    BOOST_TEST( q3.expired() );
+    BOOST_TEST( q7.expired() );
+
+    BOOST_TEST_EQ( hash( q1 ), hash( q2 ) );
+    BOOST_TEST_EQ( hash( q1 ), hash( q7 ) );
+    BOOST_TEST_NE( hash( q1 ), hash( q3 ) );
+    BOOST_TEST_NE( hash( q1 ), hash( q4 ) );
+
+    return boost::report_errors();
+}