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1 | // Boost.Bimap |
2 | // | |
3 | // Copyright (c) 2006-2007 Matias Capeletto | |
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 | /// \file container_adaptor/detail/key_extractor.hpp | |
10 | /// \brief Key extractor for a pair<Key,Data>. | |
11 | ||
12 | #ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP | |
13 | #define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP | |
14 | ||
15 | #if defined(_MSC_VER) | |
16 | #pragma once | |
17 | #endif | |
18 | ||
19 | #include <boost/config.hpp> | |
20 | ||
21 | #include <functional> | |
22 | ||
23 | namespace boost { | |
24 | namespace bimaps { | |
25 | namespace container_adaptor { | |
26 | namespace detail { | |
27 | ||
28 | /// \brief Key Extractor | |
29 | ||
30 | template < class T > | |
31 | struct key_from_pair_extractor | |
32 | : std::unary_function< T, BOOST_DEDUCED_TYPENAME T::first_type > | |
33 | { | |
34 | bool operator()( const T & p ) { return p.first; } | |
35 | }; | |
36 | ||
37 | } // namespace detail | |
38 | } // namespace container_adaptor | |
39 | } // namespace bimaps | |
40 | } // namespace boost | |
41 | ||
42 | ||
43 | #endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP | |
44 | ||
45 |