forked from boostorg/fusion
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2006 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_BEGIN_IMPL_05222005_1108)
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#define FUSION_BEGIN_IMPL_05222005_1108
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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namespace boost { namespace fusion
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{
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struct map_tag;
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namespace extension
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{
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template <typename Tag>
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struct begin_impl;
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template <>
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struct begin_impl<map_tag>
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{
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template <typename Sequence>
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struct apply
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{
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typedef typename
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result_of::begin<typename Sequence::storage_type>::type
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iterator_type;
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typedef typename
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result_of::begin<typename Sequence::storage_type const>::type
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const_iterator_type;
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typedef typename
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mpl::eval_if<
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is_const<Sequence>
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, mpl::identity<const_iterator_type>
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, mpl::identity<iterator_type>
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>::type
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type;
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static type
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call(Sequence& m)
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{
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return fusion::begin(m.get_data());
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}
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};
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};
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}
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}}
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#endif
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