src/boost/mpl/set/aux_/erase_key_impl.hpp

   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 2003-2004
   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 // $Source: /cvsroot/boost/boost/boost/mpl/set/aux_/erase_key_impl.hpp,v $
  15 // $Date: 2004/09/02 15:41:02 $
  16 // $Revision: 1.2 $
  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 boost { 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,Set> >
  44                 >
  45             , identity<Set>
  46             >
  47     {
  48     };
  49 };
  50
  51 }}
  52
  53 #endif // BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED