#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: index_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#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 |