2 #ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED
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3 #define BOOST_MPL_INDEX_IF_HPP_INCLUDED
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5 // Copyright Eric Friedman 2003
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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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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: index_if.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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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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28 namespace boost { namespace mpl {
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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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36 typedef typename iter_fold_if<
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40 , aux::find_if_pred<Predicate>
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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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47 typedef typename if_<
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48 is_same< result_iterator_,not_found_ >
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53 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate))
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56 BOOST_MPL_AUX_NA_SPEC(2, index_if)
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60 #endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED
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