Chris@16: 
Chris@16: #ifndef BOOST_MPL_COUNT_IF_HPP_INCLUDED
Chris@16: #define BOOST_MPL_COUNT_IF_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2000-2002
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #include <boost/mpl/fold.hpp>
Chris@16: #include <boost/mpl/next.hpp>
Chris@16: #include <boost/mpl/integral_c.hpp>
Chris@16: #include <boost/mpl/identity.hpp>
Chris@16: #include <boost/mpl/eval_if.hpp>
Chris@16: #include <boost/mpl/apply.hpp>
Chris@16: #include <boost/mpl/aux_/msvc_eti_base.hpp>
Chris@16: #include <boost/mpl/aux_/na_spec.hpp>
Chris@16: #include <boost/mpl/aux_/lambda_support.hpp>
Chris@16: #include <boost/mpl/aux_/config/forwarding.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpl {
Chris@16: 
Chris@16: namespace aux {
Chris@16: 
Chris@16: template< typename Predicate >
Chris@16: struct next_if
Chris@16: {
Chris@16:     template<
Chris@16:           typename N
Chris@16:         , typename T
Chris@16:         >
Chris@16:     struct apply
Chris@16: #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
Chris@16:         : eval_if<
Chris@16:               typename apply1<Predicate,T>::type
Chris@16:             , next<N>
Chris@16:             , identity<N>
Chris@16:             >
Chris@16:     {
Chris@16: #else
Chris@16:     {
Chris@16:         typedef typename eval_if<
Chris@16:               typename apply1<Predicate,T>::type
Chris@16:             , next<N>
Chris@16:             , identity<N>
Chris@16:             >::type type;
Chris@16: #endif
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: 
Chris@16: template<
Chris@16:       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
Chris@16:     , typename BOOST_MPL_AUX_NA_PARAM(Predicate)
Chris@16:     >
Chris@16: struct count_if
Chris@16:     : aux::msvc_eti_base< typename fold<
Chris@16:           Sequence
Chris@16:         , integral_c<unsigned long,0>
Chris@16:         , protect< aux::next_if<Predicate> >
Chris@16:         >::type >
Chris@16: {
Chris@16:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate))
Chris@16: };
Chris@16: 
Chris@16: BOOST_MPL_AUX_NA_SPEC(2, count_if)
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED