libstdc++-v3/testsuite/23_containers/unordered_set/requirements/52942.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2012-2025 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <unordered_set>
  21 #include <functional>
  22
  23 struct TFoo {};
  24
  25 struct TFoo_hash
  26 {
  27   std::size_t operator()(const TFoo &) const { return 0; }
  28 };
  29
  30 void f1(std::unordered_set<TFoo, TFoo_hash> &) {}
  31
  32 void f2()
  33 {
  34   std::unordered_set<TFoo, TFoo_hash> set1;
  35   std::bind(f1, std::ref(set1));
  36 }