mirror of
https://github.com/boostorg/hana.git
synced 2026-01-24 18:02:19 +00:00
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// Copyright Louis Dionne 2013-2022
|
|
// 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 TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
|
|
#define TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
|
|
|
|
#include <boost/hana/bool.hpp>
|
|
#include <boost/hana/fwd/hash.hpp>
|
|
#include <boost/hana/type.hpp>
|
|
|
|
#include <utility>
|
|
|
|
|
|
// A move-only type that's also a literal type. It is also Comparable and
|
|
// Hashable so it can be used in associative containers.
|
|
template <int i>
|
|
struct ConstexprMoveOnly {
|
|
constexpr ConstexprMoveOnly() { }
|
|
constexpr ConstexprMoveOnly(ConstexprMoveOnly const&) = delete;
|
|
constexpr ConstexprMoveOnly& operator=(ConstexprMoveOnly const&) = delete;
|
|
constexpr ConstexprMoveOnly(ConstexprMoveOnly&&) { }
|
|
};
|
|
|
|
template <int i, int j>
|
|
constexpr auto operator==(ConstexprMoveOnly<i> const&, ConstexprMoveOnly<j> const&)
|
|
{ return boost::hana::bool_c<i == j>; }
|
|
|
|
template <int i, int j>
|
|
constexpr auto operator!=(ConstexprMoveOnly<i> const&, ConstexprMoveOnly<j> const&)
|
|
{ return boost::hana::bool_c<i != j>; }
|
|
|
|
namespace boost { namespace hana {
|
|
template <int i>
|
|
struct hash_impl<ConstexprMoveOnly<i>> {
|
|
static constexpr auto apply(ConstexprMoveOnly<i> const&)
|
|
{ return hana::type_c<ConstexprMoveOnly<i>>; };
|
|
};
|
|
}}
|
|
|
|
#endif // !TEST_SUPPORT_CONSTEXPR_MOVE_ONLY_HPP
|