sl@0: 
sl@0: #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
sl@0: #define BOOST_MPL_EVAL_IF_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2000-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/eval_if.hpp,v $
sl@0: // $Date: 2004/11/28 01:54:10 $
sl@0: // $Revision: 1.3 $
sl@0: 
sl@0: #include <boost/mpl/if.hpp>
sl@0: #include <boost/mpl/aux_/na_spec.hpp>
sl@0: #include <boost/mpl/aux_/lambda_support.hpp>
sl@0: #include <boost/mpl/aux_/config/msvc.hpp>
sl@0: #include <boost/mpl/aux_/config/gcc.hpp>
sl@0: #include <boost/mpl/aux_/config/workaround.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: template<
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(C)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(F1)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(F2)
sl@0:     >
sl@0: struct eval_if
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
sl@0:      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
sl@0:         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
sl@0:         )
sl@0: {
sl@0:     typedef typename if_<C,F1,F2>::type f_;
sl@0:     typedef typename f_::type type;
sl@0: #else
sl@0:     : if_<C,F1,F2>::type
sl@0: {
sl@0: #endif
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
sl@0: };
sl@0: 
sl@0: // (almost) copy & paste in order to save one more 
sl@0: // recursively nested template instantiation to user
sl@0: template<
sl@0:       bool C
sl@0:     , typename F1
sl@0:     , typename F2
sl@0:     >
sl@0: struct eval_if_c
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
sl@0:      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
sl@0:         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
sl@0:         )
sl@0: {
sl@0:     typedef typename if_c<C,F1,F2>::type f_;
sl@0:     typedef typename f_::type type;
sl@0: #else
sl@0:     : if_c<C,F1,F2>::type
sl@0: {
sl@0: #endif
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(3, eval_if)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED