magic_enum_iostream.hpp

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//  __  __             _        ______                          _____
// |  \/  |           (_)      |  ____|                        / ____|_     _
// | \  / | __ _  __ _ _  ___  | |__   _ __  _   _ _ __ ___   | |   _| |_ _| |_
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// |_|  |_|\__,_|\__, |_|\___| |______|_| |_|\__,_|_| |_| |_|  \_____|
//                __/ | https://github.com/Neargye/magic_enum
//               |___/  version 0.9.7
//
// 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
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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,
// FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
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// SOFTWARE.
 
#ifndef NEARGYE_MAGIC_ENUM_IOSTREAM_HPP
#define NEARGYE_MAGIC_ENUM_IOSTREAM_HPP
 
#include "magic_enum.hpp"
#include "magic_enum_flags.hpp"
 
#ifndef MAGIC_ENUM_USE_STD_MODULE
#include <iosfwd>
#endif
 
namespace magic_enum {
 
namespace ostream_operators {
 
template <typename Char, typename Traits, typename E, detail::enable_if_t<E, int> = 0>
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, E value) {
  using D = std::decay_t<E>;
  using U = underlying_type_t<D>;
 
  if constexpr (detail::supported<D>::value) {
    if constexpr (detail::subtype_v<D> == detail::enum_subtype::flags) {
      if (const auto name = enum_flags_name<D>(value); !name.empty()) {
        for (const auto c : name) {
          os.put(c);
        }
        return os;
      }
    } else {
      if (const auto name = enum_name<D>(value); !name.empty()) {
        for (const auto c : name) {
          os.put(c);
        }
        return os;
      }
    }
  }
  return (os << static_cast<U>(value));
}
 
template <typename Char, typename Traits, typename E, detail::enable_if_t<E, int> = 0>
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, optional<E> value) {
  return value ? (os << *value) : os;
}
 
} // namespace magic_enum::ostream_operators
 
namespace istream_operators {
 
template <typename Char, typename Traits, typename E, detail::enable_if_t<E, int> = 0>
std::basic_istream<Char, Traits>& operator>>(std::basic_istream<Char, Traits>& is, E& value) {
  using D = std::decay_t<E>;
 
  std::basic_string<Char, Traits> s;
  is >> s;
  if constexpr (detail::supported<D>::value) {
    if constexpr (detail::subtype_v<D> == detail::enum_subtype::flags) {
      if (const auto v = enum_flags_cast<D>(s)) {
        value = *v;
      } else {
        is.setstate(std::basic_ios<Char>::failbit);
      }
    } else {
      if (const auto v = enum_cast<D>(s)) {
        value = *v;
      } else {
        is.setstate(std::basic_ios<Char>::failbit);
      }
    }
  } else {
    is.setstate(std::basic_ios<Char>::failbit);
  }
  return is;
}
 
} // namespace magic_enum::istream_operators
 
namespace iostream_operators {
 
using magic_enum::ostream_operators::operator<<;
using magic_enum::istream_operators::operator>>;
 
} // namespace magic_enum::iostream_operators
 
} // namespace magic_enum
 
#endif // NEARGYE_MAGIC_ENUM_IOSTREAM_HPP