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Merge pull request #5333 from lioncash/define

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common/parent_of_member: Replace TYPED_STORAGE define with template alias
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bunnei 2021-01-11 20:47:30 -08:00 committed by GitHub
parent eb3cb54aa5 703c57a119
commit 99d2d77062
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 9 deletions
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4
src/common/intrusive_red_black_tree.h
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@ -533,7 +533,7 @@ private:
}
private:
static constexpr TYPED_STORAGE(Derived) DerivedStorage = {};
static constexpr TypedStorage<Derived> DerivedStorage = {};
static_assert(GetParent(GetNode(GetPointer(DerivedStorage))) == GetPointer(DerivedStorage));
};
@ -549,7 +549,7 @@ public:
using TreeTypeImpl = impl::IntrusiveRedBlackTreeImpl;
static constexpr bool IsValid() {
TYPED_STORAGE(Derived) DerivedStorage = {};
TypedStorage<Derived> DerivedStorage = {};
return GetParent(GetNode(GetPointer(DerivedStorage))) == GetPointer(DerivedStorage);
}

16
src/common/parent_of_member.h
View file

@ -10,21 +10,23 @@
#include "common/common_types.h"
namespace Common {
namespace detail {
template <typename T, size_t Size, size_t Align>
struct TypedStorage {
struct TypedStorageImpl {
std::aligned_storage_t<Size, Align> storage_;
};
#define TYPED_STORAGE(...) TypedStorage<__VA_ARGS__, sizeof(__VA_ARGS__), alignof(__VA_ARGS__)>
} // namespace detail
template <typename T>
static constexpr T* GetPointer(TYPED_STORAGE(T) & ts) {
using TypedStorage = detail::TypedStorageImpl<T, sizeof(T), alignof(T)>;
template <typename T>
static constexpr T* GetPointer(TypedStorage<T>& ts) {
return static_cast<T*>(static_cast<void*>(std::addressof(ts.storage_)));
}
template <typename T>
static constexpr const T* GetPointer(const TYPED_STORAGE(T) & ts) {
static constexpr const T* GetPointer(const TypedStorage<T>& ts) {
return static_cast<const T*>(static_cast<const void*>(std::addressof(ts.storage_)));
}
@ -72,7 +74,7 @@ struct OffsetOfCalculator {
union Union {
char c{};
UnionHolder first_union;
TYPED_STORAGE(ParentType) parent;
TypedStorage<ParentType> parent;
constexpr Union() : c() {}
};