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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2008-2022 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 20.7.12.2 Template class shared_ptr [util.smartptr.shared]
  22
  23 #include <memory>
  24 #include <testsuite_hooks.h>
  25
  26 struct A { };
  27
  28 struct D {
  29     void operator()(A* p) const { delete p;  ++count; }
  30     static int count;
  31 };
  32
  33 int D::count = 0;
  34
  35 // 20.7.12.2.1 shared_ptr constructors [util.smartptr.shared.const]
  36
  37 // Construction from unique_ptr
  38 void
  39 test01()
  40 {
  41   std::unique_ptr<A, D> up(new A, D());
  42   {
  43       std::shared_ptr<A> sp(std::move(up));
  44       VERIFY( up.get() == 0 );
  45       VERIFY( sp.get() != 0 );
  46       VERIFY( sp.use_count() == 1 );
  47   }
  48   VERIFY( D::count == 1 );
  49 }
  50
  51 void
  52 test02()
  53 {
  54   D::count = 0;
  55   std::unique_ptr<A, D> up;
  56   {
  57     std::shared_ptr<A> sp = std::move(up);
  58   }
  59   VERIFY( D::count == 0 ); // LWG 2415
  60 }
  61
  62 void
  63 test03()
  64 {
  65   struct D
  66   {
  67     D() = default;
  68     D(const D&) = delete; // not copyable or movable
  69     void operator()(int* p) const { delete p; }
  70   };
  71
  72   using namespace std;
  73   static_assert( ! is_constructible<shared_ptr<int>, unique_ptr<int, D>>(),
  74                  "Constraints: is_move_constructible_v<D> is true" );
  75 }
  76
  77 int
  78 main()
  79 {
  80   test01();
  81   test02();
  82   test03();
  83 }