src/boost/mpl/aux_/push_front_impl.hpp

   1
   2 #ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
   3 #define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   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 // $Source: /cvsroot/boost/boost/boost/mpl/aux_/push_front_impl.hpp,v $
  14 // $Date: 2004/09/02 15:40:44 $
  15 // $Revision: 1.4 $
  16
  17 #include <boost/mpl/push_front_fwd.hpp>
  18 #include <boost/mpl/aux_/has_type.hpp>
  19 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  20 #include <boost/mpl/aux_/config/forwarding.hpp>
  21 #include <boost/mpl/aux_/config/static_constant.hpp>
  22
  23 namespace boost { namespace mpl {
  24
  25 // agurt 05/feb/04: no default implementation; the stub definition is needed
  26 // to enable the default 'has_push_front' implementation below
  27
  28 template< typename Tag >
  29 struct push_front_impl
  30 {
  31     template< typename Sequence, typename T > struct apply {};
  32 };
  33
  34 template< typename Tag >
  35 struct has_push_front_impl
  36 {
  37     template< typename Seq > struct apply
  38 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
  39         : aux::has_type< push_front<Seq,int> >
  40     {
  41 #else
  42     {
  43         typedef aux::has_type< push_front<Seq,int> > type;
  44         BOOST_STATIC_CONSTANT(bool, value =
  45               (aux::has_type< push_front<Seq,int> >::value)
  46             );
  47 #endif
  48     };
  49 };
  50
  51 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)
  52 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)
  53
  54 }}
  55
  56 #endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED