P0339 polymorphic_allocator<> as a vocabulary type

[jensmaurer]

P0339R5 polymorphic_allocator<> as a vocabulary type (Pablo Halpern, Dietmar Kühl)

https://issues.isocpp.org/show_bug.cgi?id=211

[mclow]

Reviewed in LWG on Tuesday in Kona; Pablo will come with an updated paper later in the week.

[mclow]

Reviewed updated paper on Thursday in LWG. Unanimous consent for C++20

[jensmaurer]

Approved by LWG Motion 3 in Kona; see cplusplus/draft#2695.

[wg21bot]

P0339R6 polymorphic_allocator<> as a vocabulary type (Pablo Halpern, Dietmar Kühl)

[wg21bot]

Adopted 2019-03.