117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
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#ifndef BOOST_MPL_FOR_EACH_HPP_INCLUDED
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#define BOOST_MPL_FOR_EACH_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2008
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id: for_each.hpp 55648 2009-08-18 05:16:53Z agurtovoy $
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// $Date: 2009-08-17 22:16:53 -0700 (Mon, 17 Aug 2009) $
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// $Revision: 55648 $
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#include <boost/mpl/is_sequence.hpp>
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/apply.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/next_prior.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/aux_/unwrap.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/utility/value_init.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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template< bool done = true >
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struct for_each_impl
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{
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template<
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typename Iterator
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, typename LastIterator
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, typename TransformFunc
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, typename F
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>
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static void execute(
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Iterator*
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, LastIterator*
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, TransformFunc*
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, F
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)
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{
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}
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};
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template<>
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struct for_each_impl<false>
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{
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template<
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typename Iterator
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, typename LastIterator
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, typename TransformFunc
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, typename F
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>
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static void execute(
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Iterator*
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, LastIterator*
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, TransformFunc*
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, F f
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)
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{
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typedef typename deref<Iterator>::type item;
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typedef typename apply1<TransformFunc,item>::type arg;
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// dwa 2002/9/10 -- make sure not to invoke undefined behavior
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// when we pass arg.
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value_initialized<arg> x;
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aux::unwrap(f, 0)(boost::get(x));
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typedef typename mpl::next<Iterator>::type iter;
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for_each_impl<boost::is_same<iter,LastIterator>::value>
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::execute( static_cast<iter*>(0), static_cast<LastIterator*>(0), static_cast<TransformFunc*>(0), f);
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}
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};
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} // namespace aux
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// agurt, 17/mar/02: pointer default parameters are necessary to workaround
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// MSVC 6.5 function template signature's mangling bug
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template<
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typename Sequence
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, typename TransformOp
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, typename F
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>
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inline
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void for_each(F f, Sequence* = 0, TransformOp* = 0)
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{
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BOOST_MPL_ASSERT(( is_sequence<Sequence> ));
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typedef typename begin<Sequence>::type first;
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typedef typename end<Sequence>::type last;
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aux::for_each_impl< boost::is_same<first,last>::value >
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::execute(static_cast<first*>(0), static_cast<last*>(0), static_cast<TransformOp*>(0), f);
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}
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template<
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typename Sequence
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, typename F
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>
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inline
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void for_each(F f, Sequence* = 0)
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{
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for_each<Sequence, identity<> >(f);
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}
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}}
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#endif // BOOST_MPL_FOR_EACH_HPP_INCLUDED
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