This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of WP status.

3310. Replace SIZE_MAX with numeric_limits<size_t>::max()

Section: 20.12.3.2 [mem.poly.allocator.mem] Status: WP Submitter: Japan Opened: 2019-11-04 Last modified: 2020-02-24

Priority: 0

View all other issues in [mem.poly.allocator.mem].

View all issues with WP status.

Discussion:

Addresses JP 218/219

It's better to use a C++ property than C standard library macro, SIZE_MAX.

[2019-11 Status to Ready during Tuesday morning issue processing in Belfast.]

Proposed resolution:

This wording is relative to N4835.

  1. Modify 20.12.3.2 [mem.poly.allocator.mem] as indicated:

    [[nodiscard]] Tp* allocate(size_t n);
    

    -1- Effects: If SIZE_MAXnumeric_limits<size_t>::max() / sizeof(Tp) < n, throws length_error. […]

    […]
    template<class T>
      T* allocate_object(size_t n = 1);
    

    -8- Effects: Allocates memory suitable for holding an array of n objects of type T, as follows:

    1. (8.1) — if SIZE_MAXnumeric_limits<size_t>::max() / sizeof(T) < n, throws length_error,

    2. (8.2) — otherwise equivalent to:

      return static_cast<T*>(allocate_bytes(n*sizeof(T), alignof(T)));