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fix #216, fix #199

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neargye 2022-11-07 21:00:16 +04:00
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commit 8bd403f888
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include/magic_enum_switch.hpp Normal file
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// __ __ _ ______ _____
// | \/ | (_) | ____| / ____|_ _
// | \ / | __ _ __ _ _ ___ | |__ _ __ _ _ _ __ ___ | | _| |_ _| |_
// | |\/| |/ _` |/ _` | |/ __| | __| | '_ \| | | | '_ ` _ \ | | |_ _|_ _|
// | | | | (_| | (_| | | (__ | |____| | | | |_| | | | | | | | |____|_| |_|
// |_| |_|\__,_|\__, |_|\___| |______|_| |_|\__,_|_| |_| |_| \_____|
// __/ | https://github.com/Neargye/magic_enum
// |___/ version 0.8.1
//
// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// SPDX-License-Identifier: MIT
// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#ifndef NEARGYE_MAGIC_ENUM_SWITCH_HPP
#define NEARGYE_MAGIC_ENUM_SWITCH_HPP
#include "magic_enum.hpp"
namespace magic_enum {
namespace detail {
struct default_result_type {};
template <typename T>
struct identity {
using type = T;
};
struct nonesuch {};
template <typename F, typename V, bool = std::is_invocable_v<F, V>>
struct invoke_result : identity<nonesuch> {};
template <typename F, typename V>
struct invoke_result<F, V, true> : std::invoke_result<F, V> {};
template <typename F, typename V>
using invoke_result_t = typename invoke_result<F, V>::type;
template <typename E, typename F, std::size_t... I>
constexpr auto common_invocable(std::index_sequence<I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::invocable_index requires enum type.");
if constexpr (count_v<E> == 0) {
return identity<nonesuch>{};
} else {
return std::common_type<invoke_result_t<F, enum_constant<values_v<E>[I]>>...>{};
}
}
template <typename E, typename Result, typename F>
constexpr auto result_type() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::result_type requires enum type.");
constexpr auto seq = std::make_index_sequence<detail::count_v<E>>{};
using R = typename decltype(common_invocable<E, F>(seq))::type;
if constexpr (std::is_same_v<Result, default_result_type>) {
if constexpr (std::is_same_v<R, nonesuch>) {
return identity<void>{};
} else {
return identity<R>{};
}
} else {
if constexpr (std::is_convertible_v<R, Result>) {
return identity<Result>{};
} else if constexpr (std::is_convertible_v<Result, R>) {
return identity<R>{};
} else {
return identity<nonesuch>{};
}
}
}
template <typename T, typename Result, typename F, typename D = std::decay_t<T>, typename R = typename decltype(result_type<D, Result, F>())::type>
using result_t = std::enable_if_t<std::is_enum_v<D> && !std::is_same_v<R, nonesuch>, R>;
} // namespace magic_enum::detail
template <typename Result = detail::default_result_type, typename E, typename F, typename R = detail::result_t<E, Result, F>>
constexpr decltype(auto) enum_switch(F&& f, E value) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_switch requires enum type.");
#if defined(MAGIC_ENUM_ENABLE_HASH)
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
std::forward<F>(f),
value,
detail::default_result_type_lambda<R>);
#else
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires defined MAGIC_ENUM_ENABLE_HASH");
#endif
}
template <typename Result, typename E, typename F, typename R = detail::result_t<E, Result, F>>
constexpr decltype(auto) enum_switch(F&& f, E value, Result&& result) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_switch requires enum type.");
#if defined(MAGIC_ENUM_ENABLE_HASH)
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
std::forward<F>(f),
value,
[&result]() -> R { return std::forward<Result>(result); });
#else
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires defined MAGIC_ENUM_ENABLE_HASH");
#endif
}
} // namespace magic_enum
template <>
struct std::common_type<magic_enum::detail::nonesuch, magic_enum::detail::nonesuch> : magic_enum::detail::identity<magic_enum::detail::nonesuch> {};
template <typename T>
struct std::common_type<T, magic_enum::detail::nonesuch> : magic_enum::detail::identity<T> {};
template <typename T>
struct std::common_type<magic_enum::detail::nonesuch, T> : magic_enum::detail::identity<T> {};
#endif // NEARGYE_MAGIC_ENUM_SWITCH_HPP