ceph/src/boost/boost/mpl/set/aux_/at_impl.hpp

   1
   2 #ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
   3 #define BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2003-2004
   6 //
   7 // Distributed under the Boost Software License, Version 1.0.
   8 // (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10 //
  11 // See http://www.boost.org/libs/mpl for documentation.
  12
  13 // $Id$
  14 // $Date$
  15 // $Revision$
  16
  17 #include <boost/mpl/at_fwd.hpp>
  18 #include <boost/mpl/set/aux_/has_key_impl.hpp>
  19 #include <boost/mpl/set/aux_/tag.hpp>
  20 #include <boost/mpl/if.hpp>
  21 #include <boost/mpl/void.hpp>
  22
  23 namespace boost { namespace mpl {
  24
  25 template<>
  26 struct at_impl< aux::set_tag >
  27 {
  28     template< typename Set, typename T > struct apply
  29     {
  30         typedef typename if_<
  31               has_key_impl<aux::set_tag>::apply<Set,T>
  32             , T
  33             , void_
  34             >::type type;
  35     };
  36 };
  37
  38 }}
  39
  40 #endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED