libstdc++-v3/testsuite/20_util/any/assign/self.cc

   1 // Copyright (C) 2015-2024 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++17 } }
  19
  20 #include <any>
  21 #include <set>
  22 #include <testsuite_hooks.h>
  23
  24 std::set<const void*> live_objects;
  25
  26 struct A {
  27   A() { live_objects.insert(this); }
  28   ~A() { live_objects.erase(this); }
  29   A(const A& a) { VERIFY(live_objects.count(&a)); live_objects.insert(this); }
  30 };
  31
  32 void
  33 test01()
  34 {
  35   using std::any;
  36
  37   any a;
  38   a = a;
  39   VERIFY( !a.has_value() );
  40
  41   a = A{};
  42   a = a;
  43   VERIFY( a.has_value() );
  44
  45   a.reset();
  46   VERIFY( live_objects.empty() );
  47 }
  48
  49 void
  50 test02()
  51 {
  52   using std::any;
  53
  54   struct X {
  55     any a;
  56   };
  57
  58   X x;
  59   std::swap(x, x); // results in "self-move-assignment" of X::a
  60   VERIFY( !x.a.has_value() );
  61
  62   x.a = A{};
  63   std::swap(x, x); // results in "self-move-assignment" of X::a
  64   VERIFY( x.a.has_value() );
  65
  66   x.a.reset();
  67   VERIFY( live_objects.empty() );
  68 }
  69
  70 void
  71 test03()
  72 {
  73   using std::any;
  74
  75   any a;
  76   a.swap(a);
  77   VERIFY( !a.has_value() );
  78
  79   a = A{};
  80   a.swap(a);
  81   VERIFY( a.has_value() );
  82
  83   a.reset();
  84   VERIFY( live_objects.empty() );
  85 }
  86
  87 int
  88 main()
  89 {
  90   test01();
  91   test02();
  92   test03();
  93 }