63e88f80
 Hu Chunming
提交三方库
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#ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
#define BOOST_MPL_EVAL_IF_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2004
//
// 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/if.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
#include <boost/mpl/aux_/lambda_support.hpp>
#include <boost/mpl/aux_/config/msvc.hpp>
#include <boost/mpl/aux_/config/gcc.hpp>
#include <boost/mpl/aux_/config/workaround.hpp>
namespace boost { namespace mpl {
template<
typename BOOST_MPL_AUX_NA_PARAM(C)
, typename BOOST_MPL_AUX_NA_PARAM(F1)
, typename BOOST_MPL_AUX_NA_PARAM(F2)
>
struct eval_if
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
|| ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
&& BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
)
{
typedef typename if_<C,F1,F2>::type f_;
typedef typename f_::type type;
#else
: if_<C,F1,F2>::type
{
#endif
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
};
// (almost) copy & paste in order to save one more
// recursively nested template instantiation to user
template<
bool C
, typename F1
, typename F2
>
struct eval_if_c
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
|| ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
&& BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
)
{
typedef typename if_c<C,F1,F2>::type f_;
typedef typename f_::type type;
#else
: if_c<C,F1,F2>::type
{
#endif
};
BOOST_MPL_AUX_NA_SPEC(3, eval_if)
}}
#endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED
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