

#ifndef BOOST_MPL_FOR_EACH_HPP_INCLUDED

#define BOOST_MPL_FOR_EACH_HPP_INCLUDED



// Copyright Aleksey Gurtovoy 2000-2004

//

// 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.



// $Source$

// $Date: 2004-09-03 21:33:47 -0400 (Fri, 03 Sep 2004) $

// $Revision: 24897 $



#include <boost/mpl/begin_end.hpp>

#include <boost/mpl/apply.hpp>

#include <boost/mpl/bool.hpp>

#include <boost/mpl/next_prior.hpp>

#include <boost/mpl/deref.hpp>

#include <boost/mpl/identity.hpp>

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



#include <boost/type_traits/is_same.hpp>

#include <boost/utility/value_init.hpp>



namespace boost { namespace mpl {



namespace aux {



template< bool done = true >

struct for_each_impl

{

    template<

          typename Iterator

        , typename LastIterator

        , typename TransformFunc

        , typename F

        >

    static void execute(

          Iterator*

        , LastIterator*

        , TransformFunc*

        , F

        )

    {

    }

};



template<>

struct for_each_impl<false>

{

    template<

          typename Iterator

        , typename LastIterator

        , typename TransformFunc

        , typename F

        >

    static void execute(

          Iterator*

        , LastIterator*

        , TransformFunc* 

        , F f

        )

    {

        typedef typename deref<Iterator>::type item;

        typedef typename apply1<TransformFunc,item>::type arg;

    

        // dwa 2002/9/10 -- make sure not to invoke undefined behavior

        // when we pass arg.

        value_initialized<arg> x;

        aux::unwrap(f, 0)(boost::get(x));

        

        typedef typename mpl::next<Iterator>::type iter;

        for_each_impl<boost::is_same<iter,LastIterator>::value>

            ::execute((iter*)0, (LastIterator*)0, (TransformFunc*)0, f);

    }

};



} // namespace aux



// agurt, 17/mar/02: pointer default parameters are necessary to workaround 

// MSVC 6.5 function template signature's mangling bug

template<

      typename Sequence

    , typename TransformOp

    , typename F

    >

inline

void for_each(F f, Sequence* = 0, TransformOp* = 0)

{

    typedef typename begin<Sequence>::type first;

    typedef typename end<Sequence>::type last;



    aux::for_each_impl< boost::is_same<first,last>::value >

        ::execute((first*)0, (last*)0, (TransformOp*)0, f);

}



template<

      typename Sequence

    , typename F

    >

inline

void for_each(F f, Sequence* = 0)

{

    for_each<Sequence, identity<> >(f);

}



}}



#endif // BOOST_MPL_FOR_EACH_HPP_INCLUDED

