1 
2 #ifndef BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
3 #define BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
4 
5 // Copyright Aleksey Gurtovoy 2003-2007
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/set/aux_/has_key_impl.hpp>
20 #include <boost/mpl/set/aux_/item.hpp>
21 #include <boost/mpl/set/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 pdalboost { namespace mpl {
29 
30 template<>
31 struct erase_key_impl< aux::set_tag >
32 {
33     template<
34           typename Set
35         , typename T
36         >
37     struct apply
38         : eval_if<
39               has_key_impl<aux::set_tag>::apply<Set,T>
40             , eval_if<
41                   is_same< T,typename Set::item_type_ >
42                 , base<Set>
43                 , identity< s_mask<T,typename Set::item_> >
44                 >
45             , identity<Set>
46             >
47     {
48     };
49 };
50 
51 }}
52 
53 #endif // BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
54