45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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/*!
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@file
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Defines `boost::hana::Sequence`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_CONCEPT_SEQUENCE_HPP
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#define BOOST_HANA_CONCEPT_SEQUENCE_HPP
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#include <boost/hana/fwd/concept/sequence.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/tag_of.hpp>
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#include <boost/hana/core/when.hpp>
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#include <boost/hana/detail/integral_constant.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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namespace detail {
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template <typename S, typename Tag = typename hana::tag_of<S>::type>
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struct sequence_dispatch
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: hana::integral_constant<bool,
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hana::Sequence<Tag>::value
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>
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{ };
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template <typename S>
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struct sequence_dispatch<S, S>
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: hana::integral_constant<bool, false>
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{ };
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}
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//! @cond
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template <typename S, bool condition>
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struct Sequence<S, when<condition>>
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: detail::sequence_dispatch<S>
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{ };
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//! @endcond
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_CONCEPT_SEQUENCE_HPP
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