ceph/src/boost/libs/intrusive/include/boost/intrusive/detail/empty_node_checker.hpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2014-2014
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // See http://www.boost.org/libs/intrusive for documentation.
  10 //
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef BOOST_INTRUSIVE_DETAIL_EMPTY_NODE_CHECKER_HPP
  14 #define BOOST_INTRUSIVE_DETAIL_EMPTY_NODE_CHECKER_HPP
  15
  16 #ifndef BOOST_CONFIG_HPP
  17 #  include <boost/config.hpp>
  18 #endif
  19
  20 #if defined(BOOST_HAS_PRAGMA_ONCE)
  21 #  pragma once
  22 #endif
  23
  24 namespace boost {
  25 namespace intrusive {
  26 namespace detail {
  27
  28 template<class ValueTraits>
  29 struct empty_node_checker
  30 {
  31    typedef ValueTraits                             value_traits;
  32    typedef typename value_traits::node_traits      node_traits;
  33    typedef typename node_traits::const_node_ptr    const_node_ptr;
  34
  35    struct return_type {};
  36
  37    void operator () (const const_node_ptr&, const return_type&, const return_type&, return_type&) {}
  38 };
  39
  40 }  //namespace detail{
  41 }  //namespace intrusive{
  42 }  //namespace boost{
  43
  44 #endif //BOOST_INTRUSIVE_DETAIL_EMPTY_NODE_CHECKER_HPP