libstdc++-v3/testsuite/experimental/memory/observer_ptr/swap/swap.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2024 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 <experimental/memory>
  21 #include <testsuite_hooks.h>
  22
  23 using std::experimental::observer_ptr;
  24
  25 struct B {};
  26 struct D : B {};
  27
  28 void test01()
  29 {
  30   observer_ptr<int> a, b;
  31   VERIFY(a == b);
  32   swap(a, b);
  33   VERIFY(a == b);
  34 }
  35
  36 void test02()
  37 {
  38   int x{};
  39   observer_ptr<int> a;
  40   observer_ptr<int> b{&x};
  41   VERIFY(!a);
  42   VERIFY(b);
  43   swap(a, b);
  44   VERIFY(a);
  45   VERIFY(!b);
  46 }
  47
  48 void test03()
  49 {
  50   int x[2]{1,2};
  51   observer_ptr<int> a{&x[0]};
  52   observer_ptr<int> b{&x[1]};
  53   VERIFY(*a == 1);
  54   VERIFY(*b == 2);
  55   swap(a, b);
  56   VERIFY(*a == 2);
  57   VERIFY(*b == 1);
  58 }
  59
  60
  61 int main()
  62 {
  63   test01();
  64   test02();
  65   test03();
  66 }