forked from boostorg/mpl
118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/for_each.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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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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#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/lambda.hpp"
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#include "boost/mpl/identity.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 {
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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 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 Iterator::next iter;
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for_each_impl<boost::is_same<iter,LastIterator>::value>::execute(
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(iter*)0, (LastIterator*)0, (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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typedef typename begin<Sequence>::type first;
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typedef typename end<Sequence>::type last;
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typedef typename lambda<TransformOp>::type transform_op;
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aux::for_each_impl< boost::is_same<first,last>::value >::execute(
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(first*)0, (last*)0, (transform_op*)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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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_FOR_EACH_HPP_INCLUDED
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