UsingEnum.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef builtin_intl_UsingEnum_h

#define builtin_intl_UsingEnum_h

#include "mozilla/MacroForEach.h"

// C++20 `using enum` declaration isn't supported in GCC 10. Provide a simple

// macro until our minimum supported GCC has been upgraded to GCC 11.

//

// Usage:

// ```

// enum class MyEnum { Foo, Bar, Baz };

//

// #ifndef USING_ENUM

//   using enum MyEnum;

// #else

//   USING_ENUM(MyEnum, Foo, Bar, Baz);

// #endif

// ```

#ifndef __cpp_using_enum

#  define USING_ENUM_DECLARE(ENUM, NAME) constexpr auto NAME = ENUM::NAME;

#  define USING_ENUM(ENUM, ...) \

    MOZ_FOR_EACH(USING_ENUM_DECLARE, (ENUM, ), (__VA_ARGS__))

#endif

#endif  // builtin_intl_UsingEnum_h