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{
  "commit": "4442e8b6cbffd113ec7bd25f449cc18f104f7150",
  "tree": "925c02e77c24c3b99e75cb7145715e1db7fecc48",
  "parents": [
    "3f18211853985a2bedc1621c999c2ac97b184333"
  ],
  "author": {
    "name": "Jakub Jelinek",
    "email": "jakub@redhat.com",
    "time": "Mon Sep 14 18:17:32 2026 +0200"
  },
  "committer": {
    "name": "Jakub Jelinek",
    "email": "jakub@gcc.gnu.org",
    "time": "Mon Sep 14 18:17:32 2026 +0200"
  },
  "message": "libstdc++, testsuite: Implement C++26 P3450R1: Extend std::is_within_lifetime paper\n\nNow that r17-4186 fixed constexpr evaluation of static_cast downcasts to diagnose\nUB, this patch implements the C++26 P3450R1: Extend std::is_within_lifetime paper\npurely in library by using __builtin_constant_p to verify if the static_cast\nmandated by the standard is a constant expression.\n\n2026-09-14  Jakub Jelinek  \u003cjakub@redhat.com\u003e\n\nlibstdc++-v3/\n\t* include/bits/version.def (within_lifetime): Change value from 202306\n\tto 202603.\n\t* include/bits/version.h: Regenerate.\n\t* include/std/type_traits: Implement C++26 P3450R1: Extend\n\tstd::is_within_lifetime paper.\n\t(std::is_within_lifetime): Add _Up template argument defaulted to void\n\tand verify static_cast\u003cconst volatile _Up*\u003e(__p) is a constant\n\texpression.\ngcc/testsuite/\n\t* g++.dg/cpp26/within-lifetime1.C: Fix up C++26 paper number and name.\n\t* g++.dg/cpp26/within-lifetime2.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime3.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime4.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime5.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime6.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime7.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime8.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime9.C: Likewise.\n\t* g++.dg/cpp26/within-lifetime10.C: New test.\n\t* g++.dg/cpp26/within-lifetime11.C: New test.\n\t* g++.dg/cpp26/within-lifetime12.C: New test.\n\nReviewed-by: Jonathan Wakely \u003cjwakely@redhat.com\u003e\n",
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