| |
| #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 |