Section: 20.2.10 [default.allocator] Status: C++20 Submitter: Jonathan Wakely Opened: 2019-10-25 Last modified: 2021-02-25 10:48:01 UTC
View other active issues in [default.allocator].
View all other issues in [default.allocator].
View all issues with C++20 status.
In C++20 the std::allocator<void> explicit specialization is gone, which means it uses the primary template, which has allocate and deallocate members.Although it's implied by the use of sizeof(T), std::allocator<T>::allocate doesn't have an explicit precondition that the value type is complete.
[2019-11 Status to 'Ready' in Monday issue prioritization in Belfast]
This wording is relative to N4835.
Modify 18.104.22.168 [allocator.members] as indicated:
[[nodiscard]] constexpr T* allocate(size_t n);
-2- Returns: A pointer to the initial element of an array of storage of size n * sizeof(T), aligned appropriately for objects of type T. […]