libstdc++-v3/testsuite/23_containers/set/move_comparison.cc

   1 // Copyright (C) 2016-2025 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 run { target c++11 } }
  19
  20 #include <set>
  21 #include <testsuite_allocator.h>
  22 #include <testsuite_hooks.h>
  23
  24 struct Cmp
  25 {
  26   Cmp() = default;
  27   Cmp(const Cmp&) = default;
  28   Cmp(Cmp&&) = default;
  29   Cmp& operator=(const Cmp&) = default;
  30   Cmp& operator=(Cmp&& c) { c.moved_from = true; return *this; }
  31
  32   bool moved_from = false;
  33
  34   bool operator()(int l, int r) const
  35   {
  36     VERIFY(!moved_from);
  37     return l < r;
  38   }
  39 };
  40
  41 void
  42 test01()
  43 {
  44   using allocator = __gnu_test::uneq_allocator<int>;
  45   using test_type = std::set<int, Cmp, allocator>;
  46   test_type s1(allocator(1)), s2(allocator(2));
  47   s1.insert(1);
  48   s1.insert(2);
  49   s1.insert(3);
  50   s2 = std::move(s1);
  51   VERIFY(s1.key_comp().moved_from);
  52 }
  53
  54 int
  55 main()
  56 {
  57   test01();
  58 }