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| 2 | #ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_INDEX_IF_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Eric Friedman 2003 |
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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: 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/aux_/find_if_pred.hpp> |
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| 18 | #include <boost/mpl/begin_end.hpp> |
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| 19 | #include <boost/mpl/if.hpp> |
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| 20 | #include <boost/mpl/int.hpp> |
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| 21 | #include <boost/mpl/iter_fold_if.hpp> |
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| 22 | #include <boost/mpl/next.hpp> |
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| 23 | #include <boost/mpl/void.hpp> |
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| 24 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 25 | #include <boost/mpl/aux_/lambda_support.hpp> |
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| 26 | #include <boost/type_traits/is_same.hpp> |
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| 27 | |
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| 28 | namespace boost { namespace mpl { |
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| 29 | |
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| 30 | template< |
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| 31 | typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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| 32 | , typename BOOST_MPL_AUX_NA_PARAM(Predicate) |
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| 33 | > |
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| 34 | struct index_if |
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| 35 | { |
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| 36 | typedef typename iter_fold_if< |
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| 37 | Sequence |
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| 38 | , int_<0> |
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| 39 | , next<> |
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| 40 | , aux::find_if_pred<Predicate> |
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| 41 | >::type result_; |
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| 42 | |
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| 43 | typedef typename end<Sequence>::type not_found_; |
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| 44 | typedef typename first<result_>::type result_index_; |
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| 45 | typedef typename second<result_>::type result_iterator_; |
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| 46 | |
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| 47 | typedef typename if_< |
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| 48 | is_same< result_iterator_,not_found_ > |
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| 49 | , void_ |
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| 50 | , result_index_ |
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| 51 | >::type type; |
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| 52 | |
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| 53 | BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate)) |
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| 54 | }; |
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| 55 | |
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| 56 | BOOST_MPL_AUX_NA_SPEC(2, index_if) |
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| 57 | |
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| 58 | }} |
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| 59 | |
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| 60 | #endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED |
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