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56 lines
1.9 KiB
56 lines
1.9 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2011 Eric Niebler
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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(BOOST_FUSION_SEGMENTED_SIZE_08112006_1141)
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#define BOOST_FUSION_SEGMENTED_SIZE_08112006_1141
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#include <boost/fusion/support/config.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/mpl/fold.hpp>
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#include <boost/mpl/plus.hpp>
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#include <boost/mpl/size_t.hpp>
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#include <boost/mpl/placeholders.hpp>
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#include <boost/fusion/sequence/intrinsic_fwd.hpp>
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#include <boost/fusion/mpl/begin.hpp>
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#include <boost/fusion/mpl/end.hpp>
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#include <boost/fusion/support/is_segmented.hpp>
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namespace boost { namespace fusion { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////
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// calculates the size of any segmented data structure.
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template<typename Sequence>
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struct segmented_size;
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///////////////////////////////////////////////////////////////////////////
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template<typename Sequence, bool IsSegmented = traits::is_segmented<Sequence>::value>
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struct segmented_size_impl
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: mpl::fold<
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typename remove_reference<
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typename add_const<
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typename result_of::segments<Sequence>::type
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>::type
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>::type
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, mpl::size_t<0>
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, mpl::plus<mpl::_1, segmented_size<remove_reference<mpl::_2> > >
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>::type
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{};
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template<typename Sequence>
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struct segmented_size_impl<Sequence, false>
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: result_of::size<Sequence>::type
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{};
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template<typename Sequence>
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struct segmented_size
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: segmented_size_impl<Sequence>
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{};
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}}}
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#endif
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