42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// Copyright Louis Dionne 2013-2017
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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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#ifndef TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
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#define TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
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#include <boost/hana/bool.hpp>
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#include <boost/hana/fwd/hash.hpp>
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#include <boost/hana/type.hpp>
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#include <utility>
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// A move-only type that's also a literal type. It is also Comparable and
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// Hashable so it can be used in associative containers.
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template <int i>
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struct ConstexprMoveOnly {
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constexpr ConstexprMoveOnly() { }
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constexpr ConstexprMoveOnly(ConstexprMoveOnly const&) = delete;
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constexpr ConstexprMoveOnly& operator=(ConstexprMoveOnly const&) = delete;
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constexpr ConstexprMoveOnly(ConstexprMoveOnly&&) { }
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};
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template <int i, int j>
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constexpr auto operator==(ConstexprMoveOnly<i> const&, ConstexprMoveOnly<j> const&)
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{ return boost::hana::bool_c<i == j>; }
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template <int i, int j>
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constexpr auto operator!=(ConstexprMoveOnly<i> const&, ConstexprMoveOnly<j> const&)
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{ return boost::hana::bool_c<i != j>; }
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namespace boost { namespace hana {
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template <int i>
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struct hash_impl<ConstexprMoveOnly<i>> {
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static constexpr auto apply(ConstexprMoveOnly<i> const&)
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{ return hana::type_c<ConstexprMoveOnly<i>>; };
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};
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}}
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#endif // !TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
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