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1 |
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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 // $Id: switch.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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15 // $Revision: 49267 $ |
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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 |