P1764 ssize() Should be Named count()

[wg21bot]

P1764R0 ssize() Should be Named count() (Tony Van Eerd)

[tituswinters]

This is a rename proposal for interfaces added in C++20 WD, adding the C++20 label.

[tituswinters]

Discussed in http://wiki.edg.com/bin/view/Wg21cologne2019/P1764

P1764

Rename std::ssize() to std::count()
SF F N A SA
0 7 4 9 8

Rename std::ssize() to std::count() and add std::count_t
SF F N A SA
0 0 3 10 15

No consensus to move forward with this paper. Dropping.