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#ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2008
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/mpl for documentation.
// $Id: push_front_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $
// $Date: 2009-08-20 00:50:16 -0700 (Thu, 20 Aug 2009) $
// $Revision: 55679 $
#include <ndnboost/mpl/push_front_fwd.hpp>
#include <ndnboost/mpl/assert.hpp>
#include <ndnboost/mpl/aux_/has_type.hpp>
#include <ndnboost/mpl/aux_/traits_lambda_spec.hpp>
#include <ndnboost/mpl/aux_/config/forwarding.hpp>
#include <ndnboost/mpl/aux_/config/static_constant.hpp>
#include <ndnboost/type_traits/is_same.hpp>
namespace ndnboost { namespace mpl {
struct has_push_front_arg {};
// agurt 05/feb/04: no default implementation; the stub definition is needed
// to enable the default 'has_push_front' implementation below
template< typename Tag >
struct push_front_impl
{
template< typename Sequence, typename T > struct apply
{
// should be instantiated only in the context of 'has_push_front_impl';
// if you've got an assert here, you are requesting a 'push_front'
// specialization that doesn't exist.
BOOST_MPL_ASSERT_MSG(
( ndnboost::is_same< T, has_push_front_arg >::value )
, REQUESTED_PUSH_FRONT_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST
, ( Sequence )
);
};
};
template< typename Tag >
struct has_push_front_impl
{
template< typename Seq > struct apply
#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
: aux::has_type< push_front< Seq, has_push_front_arg > >
{
#else
{
typedef aux::has_type< push_front< Seq, has_push_front_arg > > type;
BOOST_STATIC_CONSTANT(bool, value =
(aux::has_type< push_front< Seq, has_push_front_arg > >::value)
);
#endif
};
};
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)
}}
#endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED