boost/smart_ptr/owner_less.hpp

0001 #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
0002 #define BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
0003
0004 //
0005 //  owner_less.hpp
0006 //
0007 //  Copyright (c) 2008 Frank Mori Hess
0008 //  Copyright (c) 2016 Peter Dimov
0009 //
0010 //  Distributed under the Boost Software License, Version 1.0. (See
0011 //  accompanying file LICENSE_1_0.txt or copy at
0012 //  http://www.boost.org/LICENSE_1_0.txt)
0013 //
0014 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
0015 //
0016
0017 namespace boost
0018 {
0019
0020 template<class T = void> struct owner_less
0021 {
0022     typedef bool result_type;
0023     typedef T first_argument_type;
0024     typedef T second_argument_type;
0025
0026     template<class U, class V> bool operator()( U const & u, V const & v ) const noexcept
0027     {
0028         return u.owner_before( v );
0029     }
0030 };
0031
0032 } // namespace boost
0033
0034 #endif  // #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED