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| 2 | #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_EVAL_IF_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
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| 6 | // |
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| 7 | // Distributed under the Boost Software License, Version 1.0. |
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| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | // |
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| 11 | // See http://www.boost.org/libs/mpl for documentation. |
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| 12 | |
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| 13 | // $Id$ |
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| 14 | // $Date: 2010-05-11 17:33:24 -0400 (Tue, 11 May 2010) $ |
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| 15 | // $Revision: 61921 $ |
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| 16 | |
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| 17 | #include <boost/mpl/if.hpp> |
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| 18 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 19 | #include <boost/mpl/aux_/lambda_support.hpp> |
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| 20 | #include <boost/mpl/aux_/config/msvc.hpp> |
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| 21 | #include <boost/mpl/aux_/config/gcc.hpp> |
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| 22 | #include <boost/mpl/aux_/config/workaround.hpp> |
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| 23 | |
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| 24 | namespace boost { namespace mpl { |
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| 25 | |
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| 26 | template< |
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| 27 | typename BOOST_MPL_AUX_NA_PARAM(C) |
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| 28 | , typename BOOST_MPL_AUX_NA_PARAM(F1) |
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| 29 | , typename BOOST_MPL_AUX_NA_PARAM(F2) |
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| 30 | > |
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| 31 | struct eval_if |
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| 32 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \ |
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| 33 | || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \ |
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| 34 | && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \ |
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| 35 | ) |
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| 36 | { |
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| 37 | typedef typename if_<C,F1,F2>::type f_; |
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| 38 | typedef typename f_::type type; |
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| 39 | #else |
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| 40 | : if_<C,F1,F2>::type |
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| 41 | { |
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| 42 | #endif |
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| 43 | BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2)) |
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| 44 | }; |
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| 45 | |
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| 46 | // (almost) copy & paste in order to save one more |
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| 47 | // recursively nested template instantiation to user |
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| 48 | template< |
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| 49 | bool C |
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| 50 | , typename F1 |
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| 51 | , typename F2 |
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| 52 | > |
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| 53 | struct eval_if_c |
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| 54 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \ |
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| 55 | || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \ |
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| 56 | && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \ |
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| 57 | ) |
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| 58 | { |
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| 59 | typedef typename if_c<C,F1,F2>::type f_; |
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| 60 | typedef typename f_::type type; |
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| 61 | #else |
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| 62 | : if_c<C,F1,F2>::type |
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| 63 | { |
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| 64 | #endif |
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| 65 | }; |
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| 66 | |
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| 67 | BOOST_MPL_AUX_NA_SPEC(3, eval_if) |
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| 68 | |
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| 69 | }} |
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| 70 | |
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| 71 | #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED |
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