libstdc++-v3/testsuite/20_util/shared_ptr/casts/1.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2006-2021 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 // 20.6.6.2.10 shared_ptr casts [util.smartptr.shared.cast]
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_tr1.h>
  25
  26 struct MyP { virtual ~MyP() { }; };
  27 struct MyDP : MyP { };
  28
  29 void
  30 test01()
  31 {
  32   using __gnu_test::check_ret_type;
  33   using std::shared_ptr;
  34   using std::static_pointer_cast;
  35   using std::const_pointer_cast;
  36   using std::dynamic_pointer_cast;
  37
  38   shared_ptr<double> spd;
  39   shared_ptr<const int> spci;
  40   shared_ptr<MyP> spa;
  41
  42   check_ret_type<shared_ptr<void>>(static_pointer_cast<void>(spd));
  43   check_ret_type<shared_ptr<int>>(const_pointer_cast<int>(spci));
  44   check_ret_type<shared_ptr<MyDP>>(dynamic_pointer_cast<MyDP>(spa));
  45 }
  46
  47 void
  48 test02()
  49 {
  50   using std::shared_ptr;
  51   using std::static_pointer_cast;
  52   using std::const_pointer_cast;
  53   using std::dynamic_pointer_cast;
  54
  55   int* ptr = new int(1);
  56   shared_ptr<const void> pcv(ptr);
  57   auto pci = static_pointer_cast<const int>(pcv);
  58   VERIFY(pci.use_count() == 2);
  59   VERIFY(pcv.use_count() == 2);
  60   VERIFY(pci.get() == ptr);
  61   VERIFY(pcv.get() == ptr);
  62   auto pi = const_pointer_cast<int>(pci);
  63   VERIFY(pi.use_count() == 3);
  64   VERIFY(pcv.use_count() == 3);
  65   VERIFY(pi.get() == ptr);
  66   VERIFY(pci.get() == ptr);
  67
  68   MyP* pptr = new MyP;
  69   shared_ptr<MyP> pp(pptr);
  70   auto pdp = dynamic_pointer_cast<MyDP>(pp);
  71   VERIFY(pp.use_count() == 1);
  72   VERIFY(pdp.use_count() == 0);
  73   VERIFY(pdp.get() == nullptr);
  74   VERIFY(pp.get() == pptr);
  75   pptr = new MyDP;
  76   pp.reset(pptr);
  77   pdp = dynamic_pointer_cast<MyDP>(pp);
  78   VERIFY(pp.use_count() == 2);
  79   VERIFY(pdp.use_count() == 2);
  80   VERIFY(pdp.get() == pptr);
  81   VERIFY(pp.get() == pptr);
  82 }
  83
  84 int main()
  85 {
  86   test01();
  87   test02();
  88 }