71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
|
|
#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
|