libstdc++-v3/testsuite/20_util/auto_ptr/7.cc

   1 // Copyright (C) 2000-2020 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 // 20.4.5 Template class auto_ptr [lib.auto.ptr]
  19
  20 // { dg-options "-std=c++98" }
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A
  26 {
  27   A() { ++ctor_count; }
  28   virtual ~A() { ++dtor_count; }
  29   static long ctor_count;
  30   static long dtor_count;
  31 };
  32 long A::ctor_count = 0;
  33 long A::dtor_count = 0;
  34
  35 struct B : A
  36 {
  37   B() { ++ctor_count; }
  38   virtual ~B() { ++dtor_count; }
  39   static long ctor_count;
  40   static long dtor_count;
  41 };
  42 long B::ctor_count = 0;
  43 long B::dtor_count = 0;
  44
  45
  46 struct reset_count_struct
  47 {
  48   ~reset_count_struct()
  49   {
  50     A::ctor_count = 0;
  51     A::dtor_count = 0;
  52     B::ctor_count = 0;
  53     B::dtor_count = 0;
  54   }
  55 };
  56
  57 // 20.4.5.3 auto_ptr conversions [lib.auto.ptr.conv]
  58
  59 // Parameters and return values
  60 template <typename T>
  61 static std::auto_ptr<T> source()
  62 {
  63   return std::auto_ptr<T>(new T);
  64 }
  65
  66 template <typename T>
  67 static void drain(std::auto_ptr<T>)
  68 {}
  69
  70 int
  71 test07()
  72 {
  73   reset_count_struct __attribute__((unused)) reset;
  74
  75   drain(source<A>());
  76   // The resolution of core issue 84, now a DR, breaks this call.
  77   // drain<A>(source<B>());
  78   drain(source<B>());
  79   VERIFY( A::ctor_count == 2 );
  80   VERIFY( A::dtor_count == 2 );
  81   VERIFY( B::ctor_count == 1 );
  82   VERIFY( B::dtor_count == 1 );
  83   return 0;
  84 }
  85
  86 int
  87 main()
  88 {
  89   test07();
  90   return 0;
  91 }