libstdc++-v3/testsuite/20_util/shared_ptr/cons/nullptr.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2010-2013 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 // 20.9.11.2 Class template shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <cstddef>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_allocator.h>
  26
  27 // 20.9.11.2.1 shared_ptr constructors [util.smartptr.shared.const]
  28
  29 // Construction from nullptr
  30
  31 struct deleter
  32 {
  33   int count;
  34   deleter() : count(0) { }
  35   void operator()(std::nullptr_t) { ++count; }
  36   void operator()(int*) const { throw "wrong type passed to deleter"; }
  37 };
  38
  39 void
  40 test01()
  41 {
  42   bool test __attribute__((unused)) = true;
  43
  44   std::shared_ptr<int> p = nullptr;
  45   VERIFY( p.get() == nullptr );
  46   VERIFY( p.use_count() == 0 );
  47
  48 }
  49
  50 void
  51 test02()
  52 {
  53   bool test __attribute__((unused)) = true;
  54
  55   deleter d;
  56   std::shared_ptr<int> p(nullptr, std::ref(d));
  57   VERIFY( p.get() == nullptr );
  58   VERIFY( p.use_count() == 1 );
  59
  60   p = nullptr;
  61   VERIFY( p.use_count() == 0 );
  62   VERIFY( d.count == 1 );
  63 }
  64
  65
  66 void
  67 test03()
  68 {
  69   bool test __attribute__((unused)) = true;
  70
  71   deleter d;
  72   __gnu_test::tracker_allocator<int> a;
  73   std::shared_ptr<int> p(nullptr, std::ref(d), a);
  74   VERIFY( p.get() == nullptr );
  75   VERIFY( p.use_count() == 1 );
  76
  77   p = nullptr;
  78   VERIFY( p.use_count() == 0 );
  79   VERIFY( d.count == 1 );
  80
  81   typedef __gnu_test::tracker_allocator_counter c;
  82   VERIFY( c::get_destruct_count() == c::get_construct_count() );
  83   VERIFY( c::get_deallocation_count() == c::get_allocation_count() );
  84 }
  85
  86 int
  87 main()
  88 {
  89   test01();
  90   test02();
  91   test03();
  92   return 0;
  93 }