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https://github.com/darlinghq/darling-WTF.git
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83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <type_traits>
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namespace WTF {
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template<typename> struct EnumTraits;
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template<typename E, E...> struct EnumValues;
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template<typename T, typename E> struct EnumValueChecker;
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template<typename T, typename E, E e, E... es>
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struct EnumValueChecker<T, EnumValues<E, e, es...>> {
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static constexpr bool isValidEnum(T t)
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{
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return (static_cast<T>(e) == t) ? true : EnumValueChecker<T, EnumValues<E, es...>>::isValidEnum(t);
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}
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};
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template<typename T, typename E>
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struct EnumValueChecker<T, EnumValues<E>> {
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static constexpr bool isValidEnum(T)
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{
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return false;
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}
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};
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template<typename E, typename T, typename = std::enable_if_t<!std::is_same_v<std::underlying_type_t<E>, bool>>>
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constexpr auto isValidEnum(T t) -> decltype(EnumValueChecker<T, typename EnumTraits<E>::values>::isValidEnum(t), bool())
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{
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static_assert(sizeof(T) >= sizeof(std::underlying_type_t<E>), "Integral type must be at least the size of the underlying enum type");
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return EnumValueChecker<T, typename EnumTraits<E>::values>::isValidEnum(t);
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}
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template<typename E, typename T, typename = std::enable_if_t<!std::is_same_v<std::underlying_type_t<E>, bool>>>
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auto isValidEnum(T t) -> decltype(EnumTraits<E>::isValidEnum(t), bool())
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{
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return EnumTraits<E>::isValidEnum(t);
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}
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template<typename E, typename T, typename = std::enable_if_t<std::is_same_v<std::underlying_type_t<E>, bool>>>
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constexpr bool isValidEnum(T t)
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{
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return !t || t == 1;
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}
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template<typename E>
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constexpr auto enumToUnderlyingType(E e)
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{
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return static_cast<std::underlying_type_t<E>>(e);
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}
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}
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using WTF::isValidEnum;
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