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