#ifndef BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED | |
#define BOOST_MPL_AUX_PUSH_BACK_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_back_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $ | |
// $Date: 2009-08-20 03:50:16 -0400 (Thu, 20 Aug 2009) $ | |
// $Revision: 55679 $ | |
#include <boost/mpl/push_back_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_back_arg {}; | |
// agurt 05/feb/04: no default implementation; the stub definition is needed | |
// to enable the default 'has_push_back' implementation below | |
template< typename Tag > | |
struct push_back_impl | |
{ | |
template< typename Sequence, typename T > struct apply | |
{ | |
// should be instantiated only in the context of 'has_push_back_impl'; | |
// if you've got an assert here, you are requesting a 'push_back' | |
// specialization that doesn't exist. | |
BOOST_MPL_ASSERT_MSG( | |
( boost::is_same< T, has_push_back_arg >::value ) | |
, REQUESTED_PUSH_BACK_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST | |
, ( Sequence ) | |
); | |
}; | |
}; | |
template< typename Tag > | |
struct has_push_back_impl | |
{ | |
template< typename Seq > struct apply | |
#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) | |
: aux::has_type< push_back< Seq, has_push_back_arg > > | |
{ | |
#else | |
{ | |
typedef aux::has_type< push_back< Seq, has_push_back_arg > > type; | |
BOOST_STATIC_CONSTANT(bool, value = | |
(aux::has_type< push_back< Seq, has_push_back_arg > >::value) | |
); | |
#endif | |
}; | |
}; | |
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_back_impl) | |
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_back_impl) | |
}} | |
#endif // BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED |