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

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2016-2022 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 // 20.11.2.2.9 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::reinterpret_pointer_cast;
  35
  36   shared_ptr<double> spd;
  37   shared_ptr<const int> spci;
  38   shared_ptr<MyP> spa;
  39
  40   check_ret_type<shared_ptr<void>>(reinterpret_pointer_cast<void>(spd));
  41   check_ret_type<shared_ptr<const short>>(reinterpret_pointer_cast<const short>(spci));
  42   check_ret_type<shared_ptr<MyDP>>(reinterpret_pointer_cast<MyDP>(spa));
  43 }
  44
  45 void
  46 test02()
  47 {
  48   using std::shared_ptr;
  49   using std::reinterpret_pointer_cast;
  50
  51   int* ptr = new int(2);
  52   shared_ptr<int> pi(ptr);
  53   auto pl = reinterpret_pointer_cast<long>(pi);
  54   VERIFY(pi.use_count() == 2);
  55   VERIFY(pl.use_count() == 2);
  56   VERIFY(pi.get() == ptr);
  57   VERIFY(reinterpret_cast<int*>(pl.get()) == ptr);
  58 }
  59
  60 int main()
  61 {
  62   test01();
  63   test02();
  64 }