[all-commits] [llvm/llvm-project] 3bb903: [libc++] Treat P0513R0 as a defect report against ...

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3bb903e3c0afcc2fb17ebf2b7da127d1595dba56
      https://github.com/llvm/llvm-project/commit/3bb903e3c0afcc2fb17ebf2b7da127d1595dba56
  Author: A. Jiang <de34 at live.cn>
  Date:   2025-11-09 (Sun, 09 Nov 2025)

  Changed paths:
    M libcxx/docs/Status/Cxx17Papers.csv
    M libcxx/include/__functional/hash.h
    M libcxx/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
    M libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
    M libcxx/test/support/poisoned_hash_helper.h

  Log Message:
  -----------
  [libc++] Treat P0513R0 as a defect report against C++11 (#166690)

P0513R0 is essentially a collective resolution paper of LWG2543,
LWG2791, LWG2809, and LWG2817.

Among these LWG issues, LWG2543 (conditionally enabled `hash`) and
LWG2817 (`hash<nullptr_t>`) affect pre-C++17 utilities. We generally
backport changes from LWG issues, so this patch backports the relevant
parts of P0513R0.

Although we provide `hash<unique_ptr>` as an extension in C++03 mode, as
C++03 mode isn't encouraged now, this patch leaves `hash<unique_ptr>`
unchanged in C++03 mode.



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