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 
operator ()boost::intrusive::detail::empty_node_checker37    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
45