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

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2019-2020 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 // 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 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   using std::reinterpret_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>(std::move(spd)));
  44   check_ret_type<shared_ptr<int>>(const_pointer_cast<int>(std::move(spci)));
  45   check_ret_type<shared_ptr<MyDP>>(dynamic_pointer_cast<MyDP>(std::move(spa)));
  46   check_ret_type<shared_ptr<void>>(reinterpret_pointer_cast<void>(std::move(spd)));
  47   check_ret_type<shared_ptr<const short>>(reinterpret_pointer_cast<const short>(std::move(spci)));
  48   check_ret_type<shared_ptr<MyDP>>(reinterpret_pointer_cast<MyDP>(std::move(spa)));
  49 }
  50
  51 void
  52 test02()
  53 {
  54   using std::shared_ptr;
  55   using std::static_pointer_cast;
  56   using std::const_pointer_cast;
  57   using std::dynamic_pointer_cast;
  58   using std::reinterpret_pointer_cast;
  59
  60   int* ptr = new int(1);
  61   shared_ptr<const void> pcv(ptr);
  62   auto pci = static_pointer_cast<const int>(std::move(pcv));
  63   VERIFY(pci.use_count() == 1);
  64   VERIFY(pcv.use_count() == 0);
  65   VERIFY(pci.get() == ptr);
  66   VERIFY(pcv.get() == nullptr);
  67   auto pi = const_pointer_cast<int>(std::move(pci));
  68   VERIFY(pi.use_count() == 1);
  69   VERIFY(pci.use_count() == 0);
  70   VERIFY(pi.get() == ptr);
  71   VERIFY(pci.get() == nullptr);
  72
  73   MyP* pptr = new MyP;
  74   shared_ptr<MyP> pp(pptr);
  75   auto pdp = dynamic_pointer_cast<MyDP>(std::move(pp));
  76   VERIFY(pdp.use_count() == 0);
  77   VERIFY(pp.use_count() == 1);
  78   VERIFY(pdp.get() == nullptr);
  79   VERIFY(pp.get() == pptr);
  80   pptr = new MyDP;
  81   pp.reset(pptr);
  82   pdp = dynamic_pointer_cast<MyDP>(std::move(pp));
  83   VERIFY(pdp.use_count() == 1);
  84   VERIFY(pp.use_count() == 0);
  85   VERIFY(pdp.get() == pptr);
  86   VERIFY(pp.get() == nullptr);
  87
  88   ptr = new int(2);
  89   pi.reset(ptr);
  90   auto pl = reinterpret_pointer_cast<long>(std::move(pi));
  91   VERIFY(pl.use_count() == 1);
  92   VERIFY(pi.use_count() == 0);
  93   VERIFY(reinterpret_cast<int*>(pl.get()) == ptr);
  94   VERIFY(pi.get() == nullptr);
  95 }
  96
  97 int main()
  98 {
  99   test01();
 100   test02();
 101 }