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76 lines
2.0 KiB
76 lines
2.0 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 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_IS_VIEW_03202006_0015)
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#define FUSION_IS_VIEW_03202006_0015
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/fusion/support/tag_of.hpp>
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namespace boost { namespace fusion
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{
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// Special tags:
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struct non_fusion_tag;
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struct sequence_facade_tag;
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struct boost_tuple_tag; // boost::tuples::tuple tag
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struct boost_array_tag; // boost::array tag
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struct mpl_sequence_tag; // mpl sequence tag
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struct std_pair_tag; // std::pair tag
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namespace extension
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{
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template<typename Tag>
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struct is_view_impl
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{
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template <typename T>
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struct apply
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{
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typedef typename T::is_view type;
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};
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};
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template <>
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struct is_view_impl<non_fusion_tag>
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{
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template <typename T>
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struct apply : mpl::false_ {};
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};
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template <>
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struct is_view_impl<sequence_facade_tag>
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{
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template <typename Sequence>
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struct apply : Sequence::is_view {};
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};
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template <>
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struct is_view_impl<boost_tuple_tag>;
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template <>
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struct is_view_impl<boost_array_tag>;
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template <>
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struct is_view_impl<mpl_sequence_tag>;
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template <>
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struct is_view_impl<std_pair_tag>;
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}
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namespace traits
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{
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template <typename T>
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struct is_view :
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mpl::bool_<
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(bool)extension::is_view_impl<typename fusion::detail::tag_of<T>::type>::
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template apply<T>::type::value
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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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