TrailingTys, size_t>::type... Counts) {
return sizeof(BaseTy) + ParentType::additionalSizeToAllocImpl(0, Counts...);
}
-
- /// A type where its ::with_counts template member has a ::type member
- /// suitable for use as uninitialized storage for an object with the given
- /// trailing object counts. The template arguments are similar to those
- /// of additionalSizeToAlloc.
- ///
- /// Use with FixedSizeStorageOwner, e.g.:
- ///
- /// \code{.cpp}
- ///
- /// MyObj::FixedSizeStorage<void *>::with_counts<1u>::type myStackObjStorage;
- /// MyObj::FixedSizeStorageOwner
- /// myStackObjOwner(new ((void *)&myStackObjStorage) MyObj);
- /// MyObj *const myStackObjPtr = myStackObjOwner.get();
- ///
- /// \endcode
- template <typename... Tys> struct FixedSizeStorage {
- template <size_t... Counts> struct with_counts {
- typedef llvm::AlignedCharArray<
- llvm::AlignOf<BaseTy>::Alignment, totalSizeToAlloc<Tys...>(Counts...)
- > type;
- };
- };
-
- /// A type that acts as the owner for an object placed into fixed storage.
- class FixedSizeStorageOwner {
- public:
- FixedSizeStorageOwner(BaseTy *p) : p(p) {}
- ~FixedSizeStorageOwner() {
- assert(p && "FixedSizeStorageOwner owns null?");
- p->~BaseTy();
- }
-
- BaseTy *get() { return p; }
- const BaseTy *get() const { return p; }
-
- private:
- FixedSizeStorageOwner(const FixedSizeStorageOwner &) = delete;
- FixedSizeStorageOwner(FixedSizeStorageOwner &&) = delete;
- FixedSizeStorageOwner &operator=(const FixedSizeStorageOwner &) = delete;
- FixedSizeStorageOwner &operator=(FixedSizeStorageOwner &&) = delete;
-
- BaseTy *const p;
- };
};
} // end namespace llvm