33 lines
867 B
C++
33 lines
867 B
C++
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/*!
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@file
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Defines `boost::hana::Hashable`.
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@copyright Louis Dionne 2016
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@copyright Jason Rice 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_HASHABLE_HPP
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#define BOOST_HANA_CONCEPT_HASHABLE_HPP
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#include <boost/hana/fwd/concept/hashable.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/default.hpp>
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#include <boost/hana/core/tag_of.hpp>
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#include <boost/hana/detail/integral_constant.hpp>
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#include <boost/hana/hash.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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template <typename T>
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struct Hashable
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: hana::integral_constant<bool,
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!is_default<hash_impl<typename tag_of<T>::type>>::value
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>
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{ };
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_CONCEPT_HASHABLE_HPP
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