72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
|
|
||
|
|
#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: eval_if.hpp 61921 2010-05-11 21:33:24Z neilgroves $
|
||
|
|
// $Date: 2010-05-11 17:33:24 -0400 (Tue, 11 May 2010) $
|
||
|
|
// $Revision: 61921 $
|
||
|
|
|
||
|
|
#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
|