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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// SPDX-License-Identifier: MIT
// Copyright (c) 2019 - 2024 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.
#include <iostream>
#include <magic_enum/magic_enum.hpp>
#include <magic_enum/magic_enum_iostream.hpp>
enum class Color : int { RED = -10, BLUE = 0, GREEN = 10 };
template <typename E>
auto to_integer(magic_enum::Enum<E> value) {
// magic_enum::Enum<E> - C++17 Concept for enum type.
return static_cast<magic_enum::underlying_type_t<E>>(value);
}
int main() {
// Enum variable to string name.
Color c1 = Color::RED;
auto c1_name = magic_enum::enum_name(c1);
std::cout << c1_name << std::endl; // RED
// String enum name sequence.
constexpr auto names = magic_enum::enum_names<Color>();
std::cout << "Color names:";
for (const auto& n : names) {
std::cout << " " << n;
}
std::cout << std::endl;
// Color names: RED BLUE GREEN
// String name to enum value.
auto c2 = magic_enum::enum_cast<Color>("BLUE");
if (c2.has_value()) {
std::cout << "BLUE = " << to_integer(c2.value()) << std::endl; // BLUE = 0
}
// Case insensitive enum_cast.
c2 = magic_enum::enum_cast<Color>("blue", magic_enum::case_insensitive);
if (c2.has_value()) {
std::cout << "BLUE = " << to_integer(c2.value()) << std::endl; // BLUE = 0
}
// Integer value to enum value.
auto c3 = magic_enum::enum_cast<Color>(10);
if (c3.has_value()) {
std::cout << "GREEN = " << magic_enum::enum_integer(c3.value()) << std::endl; // GREEN = 10
}
// Enum value to integer value.
auto c4_integer = magic_enum::enum_integer(Color::RED);
std::cout << "RED = " << c4_integer << std::endl; // RED = -10
using magic_enum::iostream_operators::operator<<; // out-of-the-box ostream operator for all enums.
// Ostream operator for enum.
std::cout << "Color: " << c1 << " " << c2 << " " << c3 << std::endl; // Color: RED BLUE GREEN
// Number of enum values.
std::cout << "Color enum size: " << magic_enum::enum_count<Color>() << std::endl; // Color size: 3
// Indexed access to enum value.
std::cout << "Color[0] = " << magic_enum::enum_value<Color>(0) << std::endl; // Color[0] = RED
// Enum value sequence.
constexpr auto values = magic_enum::enum_values<Color>();
std::cout << "Colors values:";
for (const auto c : values) {
std::cout << " " << c; // Ostream operator for enum.
}
std::cout << std::endl;
// Color values: RED BLUE GREEN
enum class Flags { A = 1, B = 2, C = 4, D = 8 };
using namespace magic_enum::bitwise_operators; // out-of-the-box bitwise operators for all enums.
// Support operators: ~, |, &, ^, |=, &=, ^=.
Flags flag = Flags::A | Flags::C;
std::cout << flag << std::endl; // 5
enum color { red, green, blue };
// Checks whether type is an Unscoped enumeration.
static_assert(magic_enum::is_unscoped_enum_v<color>);
static_assert(!magic_enum::is_unscoped_enum_v<Color>);
static_assert(!magic_enum::is_unscoped_enum_v<Flags>);
// Checks whether type is an Scoped enumeration.
static_assert(!magic_enum::is_scoped_enum_v<color>);
static_assert(magic_enum::is_scoped_enum_v<Color>);
static_assert(magic_enum::is_scoped_enum_v<Flags>);
// Enum pair (value enum, string enum name) sequence.
constexpr auto entries = magic_enum::enum_entries<Color>();
std::cout << "Colors entries:";
for (const auto& e : entries) {
std::cout << " " << e.second << " = " << static_cast<int>(e.first);
}
std::cout << std::endl;
// Color entries: RED = -10 BLUE = 0 GREEN = 10
return 0;
}
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