1 #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED 2 #define BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED 3 4 // 5 // owner_less.hpp 6 // 7 // Copyright (c) 2008 Frank Mori Hess 8 // 9 // Distributed under the Boost Software License, Version 1.0. (See 10 // accompanying file LICENSE_1_0.txt or copy at 11 // http://www.boost.org/LICENSE_1_0.txt) 12 // 13 // See http://www.boost.org/libs/smart_ptr/smart_ptr.htm for documentation. 14 // 15 16 #include <functional> 17 18 namespace boost 19 { 20 template<typename T> class shared_ptr; 21 template<typename T> class weak_ptr; 22 23 namespace detail 24 { 25 template<typename T, typename U> 26 struct generic_owner_less : public std::binary_function<T, T, bool> 27 { operator ()boost::detail::generic_owner_less28 bool operator()(const T &lhs, const T &rhs) const 29 { 30 return lhs.owner_before(rhs); 31 } operator ()boost::detail::generic_owner_less32 bool operator()(const T &lhs, const U &rhs) const 33 { 34 return lhs.owner_before(rhs); 35 } operator ()boost::detail::generic_owner_less36 bool operator()(const U &lhs, const T &rhs) const 37 { 38 return lhs.owner_before(rhs); 39 } 40 }; 41 } // namespace detail 42 43 template<typename T> struct owner_less; 44 45 template<typename T> 46 struct owner_less<shared_ptr<T> >: 47 public detail::generic_owner_less<shared_ptr<T>, weak_ptr<T> > 48 {}; 49 50 template<typename T> 51 struct owner_less<weak_ptr<T> >: 52 public detail::generic_owner_less<weak_ptr<T>, shared_ptr<T> > 53 {}; 54 55 } // namespace boost 56 57 #endif // #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED 58