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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2006-2022 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 20.6.6.2.10 shared_ptr casts [util.smartptr.shared.cast]
  22
  23 #include <memory>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_tr1.h>
  26
  27 struct MyP { virtual ~MyP() { }; };
  28 struct MyDP : MyP { };
  29
  30 void
  31 test01()
  32 {
  33   using __gnu_test::check_ret_type;
  34   using std::shared_ptr;
  35   using std::static_pointer_cast;
  36   using std::const_pointer_cast;
  37   using std::dynamic_pointer_cast;
  38
  39   shared_ptr<double> spd;
  40   shared_ptr<const int> spci;
  41   shared_ptr<MyP> spa;
  42
  43   check_ret_type<shared_ptr<void>>(static_pointer_cast<void>(spd));
  44   check_ret_type<shared_ptr<int>>(const_pointer_cast<int>(spci));
  45   // Non-polymorphic dynamic_cast works without RTTI.
  46   check_ret_type<shared_ptr<MyP>>(dynamic_pointer_cast<MyP>(spa));
  47 #if __cpp_rtti
  48   // But polymorphic dynamic_cast needs RTTI.
  49   check_ret_type<shared_ptr<MyDP>>(dynamic_pointer_cast<MyDP>(spa));
  50 #endif
  51 }
  52
  53 void
  54 test02()
  55 {
  56   using std::shared_ptr;
  57   using std::static_pointer_cast;
  58   using std::const_pointer_cast;
  59   using std::dynamic_pointer_cast;
  60
  61   int* ptr = new int(1);
  62   shared_ptr<const void> pcv(ptr);
  63   auto pci = static_pointer_cast<const int>(pcv);
  64   VERIFY(pci.use_count() == 2);
  65   VERIFY(pcv.use_count() == 2);
  66   VERIFY(pci.get() == ptr);
  67   VERIFY(pcv.get() == ptr);
  68   auto pi = const_pointer_cast<int>(pci);
  69   VERIFY(pi.use_count() == 3);
  70   VERIFY(pcv.use_count() == 3);
  71   VERIFY(pi.get() == ptr);
  72   VERIFY(pci.get() == ptr);
  73
  74 #if __cpp_rtti
  75   MyP* pptr = new MyP;
  76   shared_ptr<MyP> pp(pptr);
  77   auto pdp = dynamic_pointer_cast<MyDP>(pp);
  78   VERIFY(pp.use_count() == 1);
  79   VERIFY(pdp.use_count() == 0);
  80   VERIFY(pdp.get() == nullptr);
  81   VERIFY(pp.get() == pptr);
  82   pptr = new MyDP;
  83   pp.reset(pptr);
  84   pdp = dynamic_pointer_cast<MyDP>(pp);
  85   VERIFY(pp.use_count() == 2);
  86   VERIFY(pdp.use_count() == 2);
  87   VERIFY(pdp.get() == pptr);
  88   VERIFY(pp.get() == pptr);
  89 #endif
  90 }
  91
  92 int main()
  93 {
  94   test01();
  95   test02();
  96 }