libstdc++-v3/testsuite/experimental/memory/observer_ptr/assignment/assign.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2023 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   a = b;
  32   VERIFY(a == b);
  33 }
  34
  35 void test02()
  36 {
  37   int x{};
  38   observer_ptr<int> a;
  39   observer_ptr<int> b{&x};
  40   VERIFY(a != b);
  41   a = b;
  42   VERIFY(a == b);
  43 }
  44
  45 void test03()
  46 {
  47   int x{};
  48   observer_ptr<const int> a;
  49   observer_ptr<int> b{&x};
  50   VERIFY(a != b);
  51   a = b;
  52   VERIFY(a == b);
  53 }
  54
  55 void test04()
  56 {
  57   D x{};
  58   observer_ptr<B> a;
  59   observer_ptr<D> b{&x};
  60   VERIFY(a != b);
  61   a = b;
  62   VERIFY(a == b);
  63 }
  64
  65 constexpr bool test05_helper(observer_ptr<const int> a,
  66                              observer_ptr<const int> b)
  67 {
  68   a = b;
  69   return (a.get() == b.get());
  70 }
  71
  72 void test05()
  73 {
  74   static constexpr int x{};
  75   constexpr observer_ptr<const int> a;
  76   constexpr observer_ptr<const int> b{&x};
  77   constexpr bool assigned = test05_helper(a, b);
  78   VERIFY(assigned);
  79 }
  80
  81 int main()
  82 {
  83   test01();
  84   test02();
  85   test03();
  86   test04();
  87   test05();
  88 }