example_containers_array.cpp

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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>.
// Copyright (c) 2022 - 2023 Bela Schaum <schaumb@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
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// 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
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#include <iostream>
 
#include <magic_enum/magic_enum_containers.hpp>
 
enum class Color { RED = 1, GREEN = 2, BLUE = 4 };
template <>
struct magic_enum::customize::enum_range<Color> {
  static constexpr bool is_flags = true;
};
 
struct RGB {
 
  std::uint8_t r {};
  std::uint8_t g {};
  std::uint8_t b {};
 
  [[nodiscard]] constexpr bool empty() { return std::equal_to{}(r, g) && std::equal_to{}(g, b) && std::equal_to{}(b, 0); }
 
  [[nodiscard]] constexpr bool operator==(RGB rgb) const noexcept { return std::equal_to{}(r, rgb.r) && std::equal_to{}(g, rgb.g) && std::equal_to{}(b, rgb.b); }
 
  friend std::ostream& operator<<(std::ostream& ostream, RGB rgb) {
    ostream << "R=" << static_cast<std::uint32_t>(rgb.r) << " G=" << static_cast<std::uint32_t>(rgb.g) << " B=" << static_cast<std::uint32_t>(rgb.b);
    return ostream;
  }
};
 
constexpr std::uint8_t color_max = std::numeric_limits<std::uint8_t>::max();
 
int main() {
 
  constexpr magic_enum::containers::array<Color, RGB> color_rgb_initializer {{{{color_max, 0, 0}, {0, color_max, 0}, {0, 0, color_max}}}};
 
  std::cout << magic_enum::containers::get<0>(color_rgb_initializer) << std::endl; // R=255 G=0 B=0
  std::cout << magic_enum::containers::get<1>(color_rgb_initializer) << std::endl; // R=0 G=255 B=0
  std::cout << magic_enum::containers::get<2>(color_rgb_initializer) << std::endl; // R=0 G=0 B=255
 
  std::cout << magic_enum::containers::get<Color::RED>(color_rgb_initializer) << std::endl; // R=255 G=0 B=0
  std::cout << magic_enum::containers::get<Color::GREEN>(color_rgb_initializer) << std::endl; // R=0 G=255 B=0
  std::cout << magic_enum::containers::get<Color::BLUE>(color_rgb_initializer) << std::endl; // R=0 G=0 B=255
 
  return 0;
}