Chris@16: 
Chris@16: #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
Chris@16: #define BOOST_MPL_EVAL_IF_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2000-2004
Chris@16: //
Chris@101: // Distributed under the Boost Software License, Version 1.0.
Chris@101: // (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/mpl/aux_/na_spec.hpp>
Chris@16: #include <boost/mpl/aux_/lambda_support.hpp>
Chris@16: #include <boost/mpl/aux_/config/msvc.hpp>
Chris@16: #include <boost/mpl/aux_/config/gcc.hpp>
Chris@16: #include <boost/mpl/aux_/config/workaround.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpl {
Chris@16: 
Chris@16: template<
Chris@16:       typename BOOST_MPL_AUX_NA_PARAM(C)
Chris@16:     , typename BOOST_MPL_AUX_NA_PARAM(F1)
Chris@16:     , typename BOOST_MPL_AUX_NA_PARAM(F2)
Chris@16:     >
Chris@16: struct eval_if
Chris@16: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
Chris@16:      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
Chris@16:         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
Chris@16:         )
Chris@16: {
Chris@16:     typedef typename if_<C,F1,F2>::type f_;
Chris@16:     typedef typename f_::type type;
Chris@16: #else
Chris@16:     : if_<C,F1,F2>::type
Chris@16: {
Chris@16: #endif
Chris@16:     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
Chris@16: };
Chris@16: 
Chris@101: // (almost) copy & paste in order to save one more
Chris@16: // recursively nested template instantiation to user
Chris@16: template<
Chris@16:       bool C
Chris@16:     , typename F1
Chris@16:     , typename F2
Chris@16:     >
Chris@16: struct eval_if_c
Chris@16: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
Chris@16:      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
Chris@16:         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
Chris@16:         )
Chris@16: {
Chris@16:     typedef typename if_c<C,F1,F2>::type f_;
Chris@16:     typedef typename f_::type type;
Chris@16: #else
Chris@16:     : if_c<C,F1,F2>::type
Chris@16: {
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: BOOST_MPL_AUX_NA_SPEC(3, eval_if)
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED