2 #ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED
3 #define BOOST_MPL_INDEX_IF_HPP_INCLUDED
5 // Copyright Eric Friedman 2003
7 // Distributed under the Boost Software License, Version 1.0.
8 // (See accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Id: index_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
17 #include <boost/mpl/aux_/find_if_pred.hpp>
18 #include <boost/mpl/begin_end.hpp>
19 #include <boost/mpl/if.hpp>
20 #include <boost/mpl/int.hpp>
21 #include <boost/mpl/iter_fold_if.hpp>
22 #include <boost/mpl/next.hpp>
23 #include <boost/mpl/void.hpp>
24 #include <boost/mpl/aux_/na_spec.hpp>
25 #include <boost/mpl/aux_/lambda_support.hpp>
26 #include <boost/type_traits/is_same.hpp>
28 namespace boost { namespace mpl {
31 typename BOOST_MPL_AUX_NA_PARAM(Sequence)
32 , typename BOOST_MPL_AUX_NA_PARAM(Predicate)
36 typedef typename iter_fold_if<
40 , aux::find_if_pred<Predicate>
43 typedef typename end<Sequence>::type not_found_;
44 typedef typename first<result_>::type result_index_;
45 typedef typename second<result_>::type result_iterator_;
48 is_same< result_iterator_,not_found_ >
53 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate))
56 BOOST_MPL_AUX_NA_SPEC(2, index_if)
60 #endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED