example_custom_name.cpp

// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// SPDX-License-Identifier: MIT
// Copyright (c) 2020 - 2023 Daniil Goncharov <neargye@gmail.com>.
//
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// 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
// 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,
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#include <iostream>

#include <magic_enum.hpp>

enum class Color : int { RED = -10, BLUE = 0, GREEN = 10 };

// Сustom definitions of names for enum.
// Specialization of `enum_name` must be injected in `namespace magic_enum::customize`.
template <>
constexpr magic_enum::customize::customize_t magic_enum::customize::enum_name<Color>(Color value) noexcept {
  switch (value) {
    case Color::RED:
      return "the red color";
    case Color::BLUE:
      return "The BLUE";
    case Color::GREEN:
      return invalid_tag;
  }
  return default_tag;
}

enum class Numbers : int { One, Two, Three };

// Сustom definitions of names for enum.
// Specialization of `enum_name` must be injected in `namespace magic_enum::customize`.
template <>
constexpr magic_enum::customize::customize_t magic_enum::customize::enum_name<Numbers>(Numbers value) noexcept {
  switch (value) {
    case Numbers::One:
      return "the one";
    default:
      return default_tag;
  }
}

int main() {
  std::cout << magic_enum::enum_name(Color::RED) << std::endl; // 'the red color'
  std::cout << magic_enum::enum_name(Color::BLUE) << std::endl; // 'The BLUE'
  std::cout << magic_enum::enum_name(Color::GREEN) << std::endl; // ''

  std::cout << std::boolalpha;
  std::cout << (magic_enum::enum_cast<Color>("the red color").value() == Color::RED) << std::endl; // true

  std::cout << magic_enum::enum_name(Numbers::One) << std::endl; // 'the one'
  std::cout << magic_enum::enum_name(Numbers::Two) << std::endl; // 'Two'
  std::cout << magic_enum::enum_name(Numbers::Three) << std::endl; // 'Three'

  return 0;
}