libstdc++-v3/testsuite/23_containers/unordered_multimap/insert/51866.cc

   1 // { dg-do run { 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_map>
  21 #include <testsuite_hooks.h>
  22
  23 struct num
  24 {
  25   int value;
  26   num(int n)                 : value(n) {}
  27   num(num const&)            = default;
  28   num& operator=(num const&) = default;
  29   num(num&& o)               : value(o.value)
  30   { o.value = -1; }
  31   num& operator=(num&& o)
  32   {
  33     if (this != &o)
  34       {
  35         value = o.value;
  36         o.value = -1;
  37       }
  38     return *this;
  39   }
  40 };
  41
  42 struct num_hash
  43 {
  44   size_t operator()(num const& a) const
  45   { return a.value; }
  46 };
  47
  48 struct num_equal
  49 {
  50   static bool _S_called_on_moved_instance;
  51   bool operator()(num const& a, num const& b) const
  52   {
  53     if (a.value == -1 || b.value == -1)
  54       _S_called_on_moved_instance = true;
  55     return a.value == b.value;
  56   }
  57 };
  58
  59 bool num_equal::_S_called_on_moved_instance = false;
  60
  61 // libstdc++/51866
  62 void test01()
  63 {
  64   std::unordered_multimap<num, int, num_hash, num_equal> mmap;
  65   mmap.insert(std::make_pair(num(1), 1));
  66   mmap.insert(std::make_pair(num(2), 2));
  67   mmap.insert(std::make_pair(num(1), 3));
  68   mmap.insert(std::make_pair(num(2), 4));
  69   VERIFY( mmap.size() == 4 );
  70   auto iter = mmap.cbegin();
  71   auto x0 = (iter++)->first.value;
  72   auto x1 = (iter++)->first.value;
  73   auto x2 = (iter++)->first.value;
  74   auto x3 = (iter++)->first.value;
  75   VERIFY( iter == mmap.cend() );
  76   VERIFY( (x0 == 1 && x1 == 1 && x2 == 2 && x3 == 2)
  77           || (x0 == 2 && x1 == 2 && x2 == 1 && x3 == 1) );
  78   VERIFY( !num_equal::_S_called_on_moved_instance );
  79 }
  80
  81 int main()
  82 {
  83   test01();
  84   return 0;
  85 }