libstdc++-v3/testsuite/experimental/memory/shared_ptr/cons/unique_ptr_ctor.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2019 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 // 8.2.1 Class template shared_ptr [memory.smartptr.shared]
  21
  22 #include <experimental/memory>
  23 #include <testsuite_hooks.h>
  24
  25 int destroyed = 0;
  26
  27 struct A : std::experimental::enable_shared_from_this<A>
  28 {
  29   ~A() { ++destroyed; }
  30 };
  31
  32 struct B : A { };
  33
  34 // 8.2.1.1 shared_ptr constructors [memory.smartptr.shared.const]
  35
  36 // Construction from unique_ptr<A[]>
  37
  38 template<typename From, typename To>
  39 constexpr bool constructible()
  40 {
  41   using std::experimental::shared_ptr;
  42   using std::experimental::is_constructible_v;
  43   using std::unique_ptr;
  44   return is_constructible_v<shared_ptr<To>, unique_ptr<From>>;
  45 }
  46
  47 static_assert(  constructible< A,    A    >(), "A -> A compatible" );
  48 static_assert( !constructible< A,    A[]  >(), "A -> A[] not compatible" );
  49 static_assert( !constructible< A,    A[1] >(), "A -> A[1] not compatible" );
  50 static_assert( !constructible< A[],  A    >(), "A[] -> A not compatible" );
  51 static_assert(  constructible< A[],  A[]  >(), "A[] -> A[] compatible" );
  52 static_assert( !constructible< A[],  A[1] >(), "A[] -> A[1] not compatible" );
  53
  54 static_assert(  constructible< B,    A    >(), "B -> A compatible" );
  55 static_assert( !constructible< B,    A[]  >(), "B -> A[] not compatible" );
  56 static_assert( !constructible< B,    A[1] >(), "B -> A[1] not compatible" );
  57 static_assert( !constructible< B[],  A    >(), "B[] -> A not compatible" );
  58 static_assert( !constructible< B[],  A[]  >(), "B[] -> A[] not compatible" );
  59 static_assert( !constructible< B[],  A[1] >(), "B[2] -> A[1] not compatible" );
  60
  61 void
  62 test01()
  63 {
  64   std::unique_ptr<A> up(new A);
  65   std::experimental::shared_ptr<A> sp(std::move(up));
  66   VERIFY( up.get() == 0 );
  67   VERIFY( sp.get() != 0 );
  68   VERIFY( sp.use_count() == 1 );
  69
  70   VERIFY( sp->shared_from_this() != nullptr );
  71
  72   sp.reset();
  73   VERIFY( destroyed == 1 );
  74   destroyed = 0;
  75 }
  76
  77 void
  78 test02()
  79 {
  80   std::unique_ptr<A[]> up(new A[5]);
  81   std::experimental::shared_ptr<A[]> sp(std::move(up));
  82   VERIFY( up.get() == 0 );
  83   VERIFY( sp.get() != 0 );
  84   VERIFY( sp.use_count() == 1 );
  85
  86   bool caught = false;
  87   try
  88   {
  89     sp[0].shared_from_this(); // should not be set for arrays
  90   }
  91   catch (const std::bad_weak_ptr&)
  92   {
  93     caught = true;
  94   }
  95   VERIFY( caught );
  96
  97   sp.reset();
  98   VERIFY( destroyed == 5 );
  99 }
 100
 101 int
 102 main()
 103 {
 104   test01();
 105   test02();
 106 }