P3852 R1 constexpr `is_pointer_within` memory area

[wg21bot]

P3852R0 a (constexpr) utility to check if pointer points between two related pointers (Hana Dusíková)

[hanickadot]

EWG in Croydon:

P3852R0 and P3952R0: Use of Standard Library types as a part of this interface (such as std::span/std::pair/etc) is acceptable to EWG.

SF	F	N	A	SA
13	14	10	2	0

Result: consensus

Forward P3852R0 and P3952R0 to LEWG with a suggested ship vehicle of C++29.

SF	F	N	A	SA
17	24	0	0	0

Result: strong consensus

[hanickadot]

For LEWG this paper is associated with P3952

[wg21bot]

P3852R1 constexpr is_pointer_within memory area (Hana Dusíková)

[inbal2l]

Related to: #2603, #1880
See for context: #1880 (comment)