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Diffstat (limited to 'boost/hana/concept/sequence.hpp')
| -rw-r--r-- | boost/hana/concept/sequence.hpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/boost/hana/concept/sequence.hpp b/boost/hana/concept/sequence.hpp new file mode 100644 index 0000000000..b2c6cda50c --- /dev/null +++ b/boost/hana/concept/sequence.hpp @@ -0,0 +1,41 @@ +/*! +@file +Defines `boost::hana::Sequence`. + +@copyright Louis Dionne 2013-2016 +Distributed under the Boost Software License, Version 1.0. +(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) + */ + +#ifndef BOOST_HANA_CONCEPT_SEQUENCE_HPP +#define BOOST_HANA_CONCEPT_SEQUENCE_HPP + +#include <boost/hana/fwd/concept/sequence.hpp> + +#include <boost/hana/config.hpp> +#include <boost/hana/core/tag_of.hpp> +#include <boost/hana/core/when.hpp> + + +BOOST_HANA_NAMESPACE_BEGIN + namespace detail { + template <typename S, typename Tag = typename hana::tag_of<S>::type> + struct sequence_dispatch { + static constexpr bool value = hana::Sequence<Tag>::value; + }; + + template <typename S> + struct sequence_dispatch<S, S> { + static constexpr bool value = false; + }; + } + + //! @cond + template <typename S, bool condition> + struct Sequence<S, when<condition>> + : detail::sequence_dispatch<S> + { }; + //! @endcond +BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_CONCEPT_SEQUENCE_HPP |