#ifndef BOOST_MPL_COUNT_IF_HPP_INCLUDED

#define BOOST_MPL_COUNT_IF_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2000-2002

//

// 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: count_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/fold.hpp>

#include <boost/mpl/next.hpp>

#include <boost/mpl/integral_c.hpp>

#include <boost/mpl/identity.hpp>

#include <boost/mpl/eval_if.hpp>

#include <boost/mpl/apply.hpp>

#include <boost/mpl/aux_/msvc_eti_base.hpp>

#include <boost/mpl/aux_/na_spec.hpp>

#include <boost/mpl/aux_/lambda_support.hpp>

#include <boost/mpl/aux_/config/forwarding.hpp>

namespace boost { namespace mpl {

namespace aux {

template< typename Predicate >

struct next_if

{

    template<

          typename N

        , typename T

        >

    struct apply

#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)

        : eval_if<

              typename apply1<Predicate,T>::type

            , next<N>

            , identity<N>

            >

    {

#else

    {

        typedef typename eval_if<

              typename apply1<Predicate,T>::type

            , next<N>

            , identity<N>

            >::type type;

#endif

    };

};

} // namespace aux

template<

      typename BOOST_MPL_AUX_NA_PARAM(Sequence)

    , typename BOOST_MPL_AUX_NA_PARAM(Predicate)

    >

struct count_if

    : aux::msvc_eti_base< typename fold<

          Sequence

        , integral_c<unsigned long,0>

        , protect< aux::next_if<Predicate> >

        >::type >

{

    BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate))

};

BOOST_MPL_AUX_NA_SPEC(2, count_if)

}}

#endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED