P0401 Providing size feedback in the Allocator interface

[wg21bot]

P0401R1 Providing size feedback in the Allocator interface (Chris Kennelly, Jonathan Wakely)

[tituswinters]

Design goes to LEWG first, not targeting C++20.

[tituswinters]

We want a feature like this.
SF F N A SA
2 9 2 0 0

Name choice:
5 allocate_with_size
4 overallocate
2 allocate_with_oversubscribe
6 allocate_oversize
14 allocate_at_least

Prefer a struct (probably named allocate_at_least_result_t) with named elements (vs requirement of structured bindings).
SF F N A SA
2 8 0 2 1

Revise and return.

[wg21bot]

P0401R2 Providing size feedback in the Allocator interface (Chris Kennelly, Jonathan Wakely)