author | Alex Gilkes <alex.gilkes@nokia.com> |
Tue, 27 Oct 2009 16:36:35 +0000 | |
changeset 0 | 044383f39525 |
permissions | -rw-r--r-- |
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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 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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((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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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((first*)0, (last*)0, (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 |