sl@0: 
sl@0: #ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED
sl@0: #define BOOST_MPL_INDEX_IF_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Eric Friedman 2003
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/index_if.hpp,v $
sl@0: // $Date: 2004/09/02 15:40:41 $
sl@0: // $Revision: 1.7 $
sl@0: 
sl@0: #include <boost/mpl/aux_/find_if_pred.hpp>
sl@0: #include <boost/mpl/begin_end.hpp>
sl@0: #include <boost/mpl/if.hpp>
sl@0: #include <boost/mpl/int.hpp>
sl@0: #include <boost/mpl/iter_fold_if.hpp>
sl@0: #include <boost/mpl/next.hpp>
sl@0: #include <boost/mpl/void.hpp>
sl@0: #include <boost/mpl/aux_/na_spec.hpp>
sl@0: #include <boost/mpl/aux_/lambda_support.hpp>
sl@0: #include <boost/type_traits/is_same.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: template<
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(Predicate)
sl@0:     >
sl@0: struct index_if
sl@0: {
sl@0:     typedef typename iter_fold_if<
sl@0:           Sequence
sl@0:         , int_<0>
sl@0:         , next<>
sl@0:         , aux::find_if_pred<Predicate>
sl@0:         >::type result_;
sl@0: 
sl@0:     typedef typename end<Sequence>::type not_found_;
sl@0:     typedef typename first<result_>::type result_index_;
sl@0:     typedef typename second<result_>::type result_iterator_;
sl@0: 
sl@0:     typedef typename if_<
sl@0:           is_same< result_iterator_,not_found_ >
sl@0:         , void_
sl@0:         , result_index_
sl@0:         >::type type;
sl@0: 
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate))
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(2, index_if)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED