114 lines
4.3 KiB
C++
114 lines
4.3 KiB
C++
// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <iostream>
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#include <magic_enum.hpp>
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enum class Color : int { RED = -10, BLUE = 0, GREEN = 10 };
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template <typename E>
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auto to_integer(magic_enum::Enum<E> value) {
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// magic_enum::Enum<E> - C++17 Concept for enum type.
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return static_cast<magic_enum::underlying_type_t<E>>(value);
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}
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int main() {
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// Enum variable to string name.
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Color c1 = Color::RED;
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auto c1_name = magic_enum::enum_name(c1);
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std::cout << c1_name << std::endl; // RED
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// String enum name sequence.
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constexpr auto names = magic_enum::enum_names<Color>();
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std::cout << "Color names:";
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for (const auto& n : names) {
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std::cout << " " << n;
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}
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std::cout << std::endl;
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// Color names: RED BLUE GREEN
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// String name to enum value.
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auto c2 = magic_enum::enum_cast<Color>("BLUE");
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if (c2.has_value()) {
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std::cout << "BLUE = " << to_integer(c2.value()) << std::endl; // BLUE = 0
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}
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// Integer value to enum value.
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auto c3 = magic_enum::enum_cast<Color>(10);
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if (c3.has_value()) {
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std::cout << "GREEN = " << magic_enum::enum_integer(c3.value()) << std::endl; // GREEN = 10
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}
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// Enum value to integer value.
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auto c4_integer = magic_enum::enum_integer(Color::RED);
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std::cout << "RED = " << c4_integer << std::endl; // RED = -10
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using namespace magic_enum::ostream_operators; // out-of-the-box ostream operator for all enums.
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// Ostream operator for enum.
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std::cout << "Color: " << c1 << " " << c2 << " " << c3 << std::endl; // Color: RED BLUE GREEN
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// Number of enum values.
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std::cout << "Color enum size: " << magic_enum::enum_count<Color>() << std::endl; // Color size: 3
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// Indexed access to enum value.
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std::cout << "Color[0] = " << magic_enum::enum_value<Color>(0) << std::endl; // Color[0] = RED
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// Enum value sequence.
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constexpr auto values = magic_enum::enum_values<Color>();
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std::cout << "Colors values:";
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for (const auto c : values) {
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std::cout << " " << c; // Ostream operator for enum.
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}
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std::cout << std::endl;
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// Color sequence: RED BLUE GREEN
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enum class Flags { A = 1, B = 2, C = 4, D = 8 };
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using namespace magic_enum::bitwise_operators; // out-of-the-box bitwise operators for all enums.
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// Support operators: ~, |, &, ^, |=, &=, ^=.
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Flags flag = Flags::A | Flags::C;
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std::cout << flag << std::endl; // 5
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enum color { red, green, blue };
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// Checks whether type is an Unscoped enumeration.
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static_assert(magic_enum::is_unscoped_enum_v<color>);
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static_assert(!magic_enum::is_unscoped_enum_v<Color>);
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static_assert(!magic_enum::is_unscoped_enum_v<Flags>);
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// Checks whether type is an Scoped enumeration.
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static_assert(!magic_enum::is_scoped_enum_v<color>);
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static_assert(magic_enum::is_scoped_enum_v<Color>);
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static_assert(magic_enum::is_scoped_enum_v<Flags>);
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// Enum pair (value enum, string enum name) sequence.
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constexpr auto entries = magic_enum::enum_entries<Color>();
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std::cout << "Colors entries:";
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for (const auto& e : entries) {
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std::cout << " " << e.second << " = " << static_cast<int>(e.first);
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}
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std::cout << std::endl;
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// Color entries: RED = -10 BLUE = 0 GREEN = 10
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return 0;
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}
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