libstdc++-v3/testsuite/23_containers/unordered_set/85965.cc

   1 // Copyright (C) 2019-2024 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 { target c++11 } }
  19
  20 #include <unordered_set>
  21
  22 struct Base { };
  23 struct Derived; // derives from Base, but incomplete at this point
  24
  25 struct Foo
  26 {
  27   // PR libstdc++/85965
  28   std::unordered_set<Derived*, std::equal_to<Base*>, std::hash<Base*>> u;
  29 };
  30
  31 std::size_t
  32 test01(std::unordered_set<Derived*, std::equal_to<Base*>, std::hash<Base*>> s)
  33 {
  34   // these operations should not require the comparison object
  35   auto copy = s;
  36   copy = s;
  37   return s.size();
  38 }