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1
2 #ifndef BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
3 #define BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
4
5 // Copyright Aleksey Gurtovoy 2003-2004
6 // Copyright David Abrahams 2003-2004
7 //
8 // Distributed under the Boost Software License, Version 1.0. 
9 // (See accompanying file LICENSE_1_0.txt or copy at 
10 // http://www.boost.org/LICENSE_1_0.txt)
11 //
12 // See http://www.boost.org/libs/mpl for documentation.
13
14 // $Id$
15 // $Date$
16 // $Revision$
17
18 #include <boost/mpl/erase_key_fwd.hpp>
19 #include <boost/mpl/map/aux_/has_key_impl.hpp>
20 #include <boost/mpl/map/aux_/item.hpp>
21 #include <boost/mpl/map/aux_/tag.hpp>
22 #include <boost/mpl/identity.hpp>
23 #include <boost/mpl/base.hpp>
24 #include <boost/mpl/eval_if.hpp>
25
26 #include <boost/type_traits/is_same.hpp>
27
28 namespace boost { namespace mpl {
29
30 template<>
31 struct erase_key_impl< aux::map_tag >
32 {
33     template< 
34           typename Map
35         , typename Key
36         > 
37     struct apply
38         : eval_if< 
39               has_key_impl<aux::map_tag>::apply<Map,Key>
40             , eval_if< 
41                   is_same< Key,typename Map::key_ > 
42                 , base<Map>
43                 , identity< m_mask<Key,Map> >
44                 >
45             , identity<Map>
46             >
47     {
48     };
49 };
50
51 }}
52
53 #endif // BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED