libstdc++-v3/testsuite/29_atomics/atomic/69301.cc

   1 // Copyright (C) 2017-2023 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 // { dg-require-atomic-builtins "" }
  20
  21 #include <atomic>
  22 #include <testsuite_hooks.h>
  23
  24 struct NonDefaultConstructible
  25 {
  26   NonDefaultConstructible(int i) : val(i) { }
  27   int val;
  28 };
  29
  30 template class std::atomic<NonDefaultConstructible>;
  31
  32 void
  33 test01()
  34 {
  35   std::atomic<NonDefaultConstructible> a(1);
  36   const auto n1 = a.exchange(2);
  37   VERIFY( n1.val == 1 );
  38   const auto n2 = a.load();
  39   VERIFY( n2.val == 2 );
  40 }
  41
  42 void
  43 test02()
  44 {
  45   volatile std::atomic<NonDefaultConstructible> a(1);
  46   const auto n1 = a.exchange(2);
  47   VERIFY( n1.val == 1 );
  48   const auto n2 = a.load();
  49   VERIFY( n2.val == 2 );
  50 }
  51
  52 int
  53 main()
  54 {
  55   test01();
  56   test02();
  57 }