c++ - How did std::allocators allow to support near/far pointers?

Question

Several sources ([1],[2]) mention that the purpose of std::allocator was to allow for different pointer types (near/far/huge) on 16 bit platforms and parts of this original design still remain in the standard.

My questions are:

1. How specifically did allocators work with different pointer types those days? For example, if near pointer is meaningless without a value in DS register, how could near pointer allocator be useful?

2. Was there something in allocator requirements which was removed from standard, totally breaking support for segmented memory? If not, are the same facilities still used on modern 16 bit platforms, shall one exist which has a c++ compiler?

[1] https://www.youtube.com/watch?v=LIb3L4vKZ7U

[2] Josuttis, The C++ Standard Library: A Tutorial and Reference

question from:https://stackoverflow.com/questions/65602009/how-did-stdallocators-allow-to-support-near-far-pointers

Answer 1

Waitting for answers