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