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

   1 // { dg-options "-Wno-deprecated" }
   2 // { dg-add-options using-deprecated }
   3 // { dg-do run { target c++11 } }
   4 // { dg-require-effective-target hosted }
   5
   6 // Copyright (C) 2005-2024 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  24
  25 #include <memory>
  26 #include <testsuite_hooks.h>
  27
  28 struct A { };
  29
  30 int destroyed = 0;
  31 struct B : A { ~B() { ++destroyed; } };
  32
  33 // 20.6.6.2.1 shared_ptr constructors [util.smartptr.shared.const]
  34
  35 // Construction from auto_ptr
  36
  37 template<typename From, typename To>
  38 constexpr bool constructible()
  39 {
  40   using namespace std;
  41   return is_constructible<shared_ptr<To>, auto_ptr<From>>::value
  42     && is_constructible<shared_ptr<const To>, auto_ptr<From>>::value
  43     && is_constructible<shared_ptr<const To>, auto_ptr<const From>>::value;
  44 }
  45
  46 static_assert(  constructible< A,   A    >(), "A -> A compatible" );
  47 static_assert(  constructible< B,   A    >(), "B -> A compatible" );
  48 static_assert(  constructible< int, int  >(), "int -> int compatible" );
  49 static_assert( !constructible< int, long >(), "int -> long not compatible" );
  50
  51 void
  52 test01()
  53 {
  54   std::auto_ptr<A> a(new A);
  55   std::shared_ptr<A> a2(std::move(a));
  56   VERIFY( a.get() == 0 );
  57   VERIFY( a2.get() != 0 );
  58   VERIFY( a2.use_count() == 1 );
  59 }
  60
  61 void
  62 test02()
  63 {
  64   std::auto_ptr<B> b(new B);
  65   std::shared_ptr<A> a(std::move(b));
  66   VERIFY( b.get() == 0 );
  67   VERIFY( a.get() != 0 );
  68   VERIFY( a.use_count() == 1 );
  69   a.reset();
  70   VERIFY( destroyed == 1 );
  71 }
  72
  73 int
  74 main()
  75 {
  76   test01();
  77   test02();
  78   return 0;
  79 }