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99 lines
3.9 KiB
C++
99 lines
3.9 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 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 Color { RED = -10, BLUE = 0, GREEN = 10 };
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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 color_names = magic_enum::enum_names<Color>();
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std::cout << "Color names:";
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for (auto n : color_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() && c2.value() == Color::BLUE) {
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std::cout << "BLUE = " << 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() && c3.value() == Color::GREEN) {
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std::cout << "GREEN = " << c3.value() << std::endl; // GREEN = 10
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}
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// Enum value to integer value.
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auto color_underlying = magic_enum::integer_cast(Color::RED);
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if (color_underlying.has_value() && color_underlying.value() == static_cast<std::underlying_type_t<Color>>(Color::RED)) {
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std::cout << "RED = " << color_underlying.value() << std::endl; // RED = -10
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}
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// Enum value to specific type integer value.
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auto color_int = magic_enum::integer_cast<int>(Color::RED);
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if (color_int.has_value() && color_int.value() == static_cast<int>(Color::RED)) {
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std::cout << "RED = " << color_int.value() << std::endl; // RED = -10
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}
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using namespace magic_enum::ops; // out-of-the-box stream operator for 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 enum 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 colors = magic_enum::enum_values<Color>();
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std::cout << "Colors sequence:";
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for (Color c : colors) {
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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 color { red, green, blue };
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enum class direction { left, right };
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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<direction>);
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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<direction>);
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return 0;
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}
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