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| 2 | #ifndef BOOST_MPL_SWITCH_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_SWITCH_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2003-2004 |
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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 | // $Source: /cvsroot/boost/boost/boost/mpl/switch.hpp,v $ |
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| 14 | // $Date: 2004/09/02 15:40:42 $ |
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| 15 | // $Revision: 1.3 $ |
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| 16 | |
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| 17 | #include <boost/mpl/find_if.hpp> |
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| 18 | #include <boost/mpl/deref.hpp> |
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| 19 | #include <boost/mpl/lambda.hpp> |
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| 20 | #include <boost/mpl/apply.hpp> |
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| 21 | #include <boost/mpl/pair.hpp> |
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| 22 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 23 | #include <boost/mpl/aux_/lambda_support.hpp> |
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| 24 | |
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| 25 | namespace boost { namespace mpl { |
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| 26 | |
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| 27 | template< |
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| 28 | typename BOOST_MPL_AUX_NA_PARAM(Body) |
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| 29 | , typename BOOST_MPL_AUX_NA_PARAM(T) |
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| 30 | > |
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| 31 | struct switch_ |
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| 32 | { |
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| 33 | typedef typename find_if< |
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| 34 | Body |
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| 35 | , apply1< lambda< first<_1> >, T > |
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| 36 | >::type iter_; |
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| 37 | |
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| 38 | typedef typename deref<iter_>::type pair_; |
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| 39 | typedef typename lambda< typename second<pair_>::type >::type f_; |
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| 40 | typedef typename apply1<f_,T>::type type; |
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| 41 | |
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| 42 | BOOST_MPL_AUX_LAMBDA_SUPPORT(2,switch_,(Body,T)) |
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| 43 | }; |
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| 44 | |
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| 45 | BOOST_MPL_AUX_NA_SPEC(2, switch_) |
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| 46 | |
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| 47 | }} |
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| 48 | |
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| 49 | #endif // BOOST_MPL_SWITCH_HPP_INCLUDED |
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