ceph/src/boost/libs/smart_ptr/include/boost/smart_ptr/owner_less.hpp

   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     {
  28       bool operator()(const T &lhs, const T &rhs) const
  29       {
  30         return lhs.owner_before(rhs);
  31       }
  32       bool operator()(const T &lhs, const U &rhs) const
  33       {
  34         return lhs.owner_before(rhs);
  35       }
  36       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