72 lines
2.1 KiB
Plaintext
72 lines
2.1 KiB
Plaintext
|
|
||
|
|
#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.
|
||
|
|
|
||
|
|
// $Id$
|
||
|
|
// $Date$
|
||
|
|
// $Revision$
|
||
|
|
|
||
|
|
#include <boost/mpl/push_front_fwd.hpp>
|
||
|
|
#include <boost/mpl/assert.hpp>
|
||
|
|
#include <boost/mpl/aux_/has_type.hpp>
|
||
|
|
#include <boost/mpl/aux_/traits_lambda_spec.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/forwarding.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/static_constant.hpp>
|
||
|
|
|
||
|
|
#include <boost/type_traits/is_same.hpp>
|
||
|
|
|
||
|
|
namespace boost { 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(
|
||
|
|
( boost::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
|