整理

include/boost/smart_ptr/owner_less.hpp

@@ -0,0 +1,34 @@
+#ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+#define BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+
+//
+//  owner_less.hpp
+//
+//  Copyright (c) 2008 Frank Mori Hess
+//  Copyright (c) 2016 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)
+//
+//  See http://www.boost.org/libs/smart_ptr/ for documentation.
+//
+
+namespace boost
+{
+
+template<class T = void> struct owner_less
+{
+    typedef bool result_type;
+    typedef T first_argument_type;
+    typedef T second_argument_type;
+
+    template<class U, class V> bool operator()( U const & u, V const & v ) const noexcept
+    {
+        return u.owner_before( v );
+    }
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED