libstdc++-v3/testsuite/23_containers/unordered_set/55043.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2013-2025 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 // libstdc++/55043
  21
  22 #include <unordered_set>
  23 #include <vector>
  24
  25 struct MoveOnly
  26 {
  27   MoveOnly() = default;
  28   MoveOnly(MoveOnly&&) = default;
  29 };
  30
  31 struct equal
  32 {
  33   bool
  34   operator()(const MoveOnly&, const MoveOnly&) const
  35   { return true; }
  36 };
  37
  38 struct hash
  39 {
  40   std::size_t
  41   operator()(const MoveOnly&) const
  42   { return 0; }
  43 };
  44
  45 template<typename Alloc>
  46   using test_type = std::unordered_set<MoveOnly, hash, equal, Alloc>;
  47
  48 void test01()
  49 {
  50   typedef test_type<std::allocator<MoveOnly>> uim;
  51   std::vector<uim> v;
  52   v.emplace_back(uim());
  53 }