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add enum_next_value and enum_prev_value

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neargye 2023-06-12 17:45:42 +04:00
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include/magic_enum_utility.hpp Normal file
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// __ __ _ ______ _____
// | \/ | (_) | ____| / ____|_ _
// | \ / | __ _ __ _ _ ___ | |__ _ __ _ _ _ __ ___ | | _| |_ _| |_
// | |\/| |/ _` |/ _` | |/ __| | __| | '_ \| | | | '_ ` _ \ | | |_ _|_ _|
// | | | | (_| | (_| | | (__ | |____| | | | |_| | | | | | | | |____|_| |_|
// |_| |_|\__,_|\__, |_|\___| |______|_| |_|\__,_|_| |_| |_| \_____|
// __/ | https://github.com/Neargye/magic_enum
// |___/ version 0.9.1
//
// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// SPDX-License-Identifier: MIT
// Copyright (c) 2019 - 2023 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_UTILITY_HPP
#define NEARGYE_MAGIC_ENUM_UTILITY_HPP
#include "magic_enum.hpp"
namespace magic_enum {
template <typename E, detail::enum_subtype S = detail::subtype_v<E>>
[[nodiscard]] constexpr auto enum_next_value(E value, std::ptrdiff_t n = 1) noexcept -> detail::enable_if_t<E, optional<std::decay_t<E>>> {
using D = std::decay_t<E>;
constexpr auto count = detail::count_v<D, S>;
if (const auto i = enum_index<D, S>(value)) {
const std::ptrdiff_t index = (static_cast<std::ptrdiff_t>(*i) + n);
if (index >= 0 && index < count) {
return enum_value<D, S>(index);
}
}
return {};
}
template <typename E, detail::enum_subtype S = detail::subtype_v<E>>
[[nodiscard]] constexpr auto enum_next_value_circular(E value, std::ptrdiff_t n = 1) noexcept -> detail::enable_if_t<E, std::decay_t<E>> {
using D = std::decay_t<E>;
constexpr std::ptrdiff_t count = detail::count_v<D, S>;
if (const auto i = enum_index<D, S>(value)) {
const std::ptrdiff_t index = ((((static_cast<std::ptrdiff_t>(*i) + n) % count) + count) % count);
if (index >= 0 && index < count) {
return enum_value<D, S>(index);
}
}
return MAGIC_ENUM_ASSERT(false), value;
}
template <typename E, detail::enum_subtype S = detail::subtype_v<E>>
[[nodiscard]] constexpr auto enum_prev_value(E value, std::ptrdiff_t n = 1) noexcept -> detail::enable_if_t<E, optional<std::decay_t<E>>> {
using D = std::decay_t<E>;
constexpr auto count = detail::count_v<D, S>;
if (const auto i = enum_index<D, S>(value)) {
const std::ptrdiff_t index = (static_cast<std::ptrdiff_t>(*i) - n);
if (index >= 0 && index < count) {
return enum_value<D, S>(index);
}
}
return {};
}
template <typename E, detail::enum_subtype S = detail::subtype_v<E>>
[[nodiscard]] constexpr auto enum_prev_value_circular(E value, std::ptrdiff_t n = 1) noexcept -> detail::enable_if_t<E, std::decay_t<E>> {
using D = std::decay_t<E>;
constexpr std::ptrdiff_t count = detail::count_v<D, S>;
if (const auto i = enum_index<D, S>(value)) {
const std::ptrdiff_t index = ((((static_cast<std::ptrdiff_t>(*i) - n) % count) + count) % count);
if (index >= 0 && index < count) {
return enum_value<D, S>(index);
}
}
return MAGIC_ENUM_ASSERT(false), value;
}
} // namespace magic_enum
#endif // NEARGYE_MAGIC_ENUM_UTILITY_HPP