libstdc++-v3/testsuite/25_algorithms/make_heap/80064.cc

   1 // Copyright (C) 2017-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile }
  19
  20 #include <algorithm>
  21
  22 void
  23 test01(int* first, int* last)
  24 {
  25   extern bool cmp(int, int);
  26   // PR libstdc++/80064
  27   // This is undefined, because [alg.sorting] requires the template argument
  28   // Compare to be a function object type, and bool(int, int) is not an
  29   // object type. We previously accepted it by accident, so keep doing so.
  30   std::make_heap<int*, bool(int, int)>(first, last, cmp);
  31 }