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type-traits.h
// Copyright 2020 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef INCLUDE_CPPGC_TYPE_TRAITS_H_ #define INCLUDE_CPPGC_TYPE_TRAITS_H_ // This file should stay with minimal dependencies to allow embedder to check // against Oilpan types without including any other parts. #include <cstddef> #include <type_traits> namespace cppgc { class Visitor; namespace internal { template <typename T, typename WeaknessTag, typename WriteBarrierPolicy, typename CheckingPolicy, typename StorageType> class BasicMember; struct DijkstraWriteBarrierPolicy; struct NoWriteBarrierPolicy; class StrongMemberTag; class UntracedMemberTag; class WeakMemberTag; // Not supposed to be specialized by the user. template <typename T> struct IsWeak : std::false_type {}; // IsTraceMethodConst is used to verify that all Trace methods are marked as // const. It is equivalent to IsTraceable but for a non-const object. template <typename T, typename = void> struct IsTraceMethodConst : std::false_type {}; template <typename T> struct IsTraceMethodConst<T, std::void_t<decltype(std::declval<const T>().Trace( std::declval<Visitor*>()))>> : std::true_type { }; template <typename T, typename = void> struct IsTraceable : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct IsTraceable< T, std::void_t<decltype(std::declval<T>().Trace(std::declval<Visitor*>()))>> : std::true_type { // All Trace methods should be marked as const. If an object of type // 'T' is traceable then any object of type 'const T' should also // be traceable. static_assert(IsTraceMethodConst<T>(), "Trace methods should be marked as const."); }; template <typename T> constexpr bool IsTraceableV = IsTraceable<T>::value; template <typename T, typename = void> struct HasGarbageCollectedMixinTypeMarker : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct HasGarbageCollectedMixinTypeMarker< T, std::void_t< typename std::remove_const_t<T>::IsGarbageCollectedMixinTypeMarker>> : std::true_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T, typename = void> struct HasGarbageCollectedTypeMarker : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct HasGarbageCollectedTypeMarker< T, std::void_t<typename std::remove_const_t<T>::IsGarbageCollectedTypeMarker>> : std::true_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T, bool = HasGarbageCollectedTypeMarker<T>::value, bool = HasGarbageCollectedMixinTypeMarker<T>::value> struct IsGarbageCollectedMixinType : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct IsGarbageCollectedMixinType<T, false, true> : std::true_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T, bool = HasGarbageCollectedTypeMarker<T>::value> struct IsGarbageCollectedType : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct IsGarbageCollectedType<T, true> : std::true_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct IsGarbageCollectedOrMixinType : std::integral_constant<bool, IsGarbageCollectedType<T>::value || IsGarbageCollectedMixinType<T>::value> { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T, bool = (HasGarbageCollectedTypeMarker<T>::value && HasGarbageCollectedMixinTypeMarker<T>::value)> struct IsGarbageCollectedWithMixinType : std::false_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename T> struct IsGarbageCollectedWithMixinType<T, true> : std::true_type { static_assert(sizeof(T), "T must be fully defined"); }; template <typename BasicMemberCandidate, typename WeaknessTag, typename WriteBarrierPolicy> struct IsSubclassOfBasicMemberTemplate { private: template <typename T, typename CheckingPolicy, typename StorageType> static std::true_type SubclassCheck( BasicMember<T, WeaknessTag, WriteBarrierPolicy, CheckingPolicy, StorageType>*); static std::false_type SubclassCheck(...); public: static constexpr bool value = decltype(SubclassCheck(std::declval<BasicMemberCandidate*>()))::value; }; template <typename T, bool = IsSubclassOfBasicMemberTemplate< T, StrongMemberTag, DijkstraWriteBarrierPolicy>::value> struct IsMemberType : std::false_type {}; template <typename T> struct IsMemberType<T, true> : std::true_type {}; template <typename T, bool = IsSubclassOfBasicMemberTemplate< T, WeakMemberTag, DijkstraWriteBarrierPolicy>::value> struct IsWeakMemberType : std::false_type {}; template <typename T> struct IsWeakMemberType<T, true> : std::true_type {}; template <typename T, bool = IsSubclassOfBasicMemberTemplate< T, UntracedMemberTag, NoWriteBarrierPolicy>::value> struct IsUntracedMemberType : std::false_type {}; template <typename T> struct IsUntracedMemberType<T, true> : std::true_type {}; template <typename T> struct IsComplete { private: template <typename U, size_t = sizeof(U)> static std::true_type IsSizeOfKnown(U*); static std::false_type IsSizeOfKnown(...); public: static constexpr bool value = decltype(IsSizeOfKnown(std::declval<T*>()))::value; }; template <typename T, typename U> constexpr bool IsDecayedSameV = std::is_same_v<std::decay_t<T>, std::decay_t<U>>; template <typename B, typename D> constexpr bool IsStrictlyBaseOfV = std::is_base_of_v<std::decay_t<B>, std::decay_t<D>> && !IsDecayedSameV<B, D>; } // namespace internal /** * Value is true for types that inherit from `GarbageCollectedMixin` but not * `GarbageCollected<T>` (i.e., they are free mixins), and false otherwise. */ template <typename T> constexpr bool IsGarbageCollectedMixinTypeV = internal::IsGarbageCollectedMixinType<T>::value; /** * Value is true for types that inherit from `GarbageCollected<T>`, and false * otherwise. */ template <typename T> constexpr bool IsGarbageCollectedTypeV = internal::IsGarbageCollectedType<T>::value; /** * Value is true for types that inherit from either `GarbageCollected<T>` or * `GarbageCollectedMixin`, and false otherwise. */ template <typename T> constexpr bool IsGarbageCollectedOrMixinTypeV = internal::IsGarbageCollectedOrMixinType<T>::value; /** * Value is true for types that inherit from `GarbageCollected<T>` and * `GarbageCollectedMixin`, and false otherwise. */ template <typename T> constexpr bool IsGarbageCollectedWithMixinTypeV = internal::IsGarbageCollectedWithMixinType<T>::value; /** * Value is true for types of type `Member<T>`, and false otherwise. */ template <typename T> constexpr bool IsMemberTypeV = internal::IsMemberType<T>::value; /** * Value is true for types of type `UntracedMember<T>`, and false otherwise. */ template <typename T> constexpr bool IsUntracedMemberTypeV = internal::IsUntracedMemberType<T>::value; /** * Value is true for types of type `WeakMember<T>`, and false otherwise. */ template <typename T> constexpr bool IsWeakMemberTypeV = internal::IsWeakMemberType<T>::value; /** * Value is true for types that are considered weak references, and false * otherwise. */ template <typename T> constexpr bool IsWeakV = internal::IsWeak<T>::value; /** * Value is true for types that are complete, and false otherwise. */ template <typename T> constexpr bool IsCompleteV = internal::IsComplete<T>::value; } // namespace cppgc #endif // INCLUDE_CPPGC_TYPE_TRAITS_H_