72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
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#ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
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#define BOOST_MPL_EVAL_IF_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/aux_/config/msvc.hpp>
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#include <boost/mpl/aux_/config/gcc.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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namespace boost { namespace mpl {
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template<
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typename BOOST_MPL_AUX_NA_PARAM(C)
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, typename BOOST_MPL_AUX_NA_PARAM(F1)
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, typename BOOST_MPL_AUX_NA_PARAM(F2)
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>
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struct eval_if
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
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|| ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
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&& BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
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)
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{
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typedef typename if_<C,F1,F2>::type f_;
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typedef typename f_::type type;
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#else
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: if_<C,F1,F2>::type
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{
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#endif
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BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
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};
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// (almost) copy & paste in order to save one more
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// recursively nested template instantiation to user
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template<
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bool C
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, typename F1
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, typename F2
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>
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struct eval_if_c
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
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|| ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
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&& BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
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)
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{
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typedef typename if_c<C,F1,F2>::type f_;
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typedef typename f_::type type;
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#else
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: if_c<C,F1,F2>::type
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{
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#endif
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};
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BOOST_MPL_AUX_NA_SPEC(3, eval_if)
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}}
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#endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED
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