61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
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#ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED
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#define BOOST_MPL_INDEX_IF_HPP_INCLUDED
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// Copyright Eric Friedman 2003
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/aux_/find_if_pred.hpp>
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/iter_fold_if.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/void.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace mpl {
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template<
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typename BOOST_MPL_AUX_NA_PARAM(Sequence)
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, typename BOOST_MPL_AUX_NA_PARAM(Predicate)
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>
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struct index_if
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{
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typedef typename iter_fold_if<
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Sequence
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, int_<0>
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, next<>
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, aux::find_if_pred<Predicate>
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>::type result_;
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typedef typename end<Sequence>::type not_found_;
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typedef typename first<result_>::type result_index_;
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typedef typename second<result_>::type result_iterator_;
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typedef typename if_<
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is_same< result_iterator_,not_found_ >
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, void_
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, result_index_
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>::type type;
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BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate))
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};
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BOOST_MPL_AUX_NA_SPEC(2, index_if)
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}}
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#endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED
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