libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2016-2020 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 // 20.7.1 Class template unique_ptr [unique.ptr]
  21
  22 #include <memory>
  23
  24 struct A { virtual ~A() = default; };
  25
  26 struct B : A { };
  27
  28 // Construction from objects with different cv-qualification
  29
  30 struct A_pointer { operator A*() const { return nullptr; } };
  31
  32 void
  33 test07()
  34 {
  35   A_pointer p;
  36   // Disallow conversions from user-defined pointer-like types
  37   // for the array version
  38   std::unique_ptr<A[]> upA3(p); // { dg-error "no matching function" }
  39   std::unique_ptr<const A[]> cA3(p); // { dg-error "no matching function" }
  40   std::unique_ptr<volatile A[]> vA3(p); // { dg-error "no matching function" }
  41   std::unique_ptr<const volatile A[]> cvA3(p); // { dg-error "no matching function" }
  42   // { dg-prune-output "no type" }
  43 }
  44
  45 template<typename T>
  46 struct deleter
  47 {
  48   deleter() = default;
  49   template<typename U>
  50     deleter(const deleter<U>) { }
  51   typedef T pointer;
  52   void operator()(T) const { }
  53 };
  54
  55 void
  56 test08()
  57 {
  58   // Disallow conversions from non-assignable deleter
  59   std::unique_ptr<A[], deleter<A_pointer>> p;
  60   std::unique_ptr<A[], deleter<A*>> upA(std::move(p)); // { dg-error "no matching function" }
  61 }
  62
  63 void
  64 test011()
  65 {
  66   // Disallow conversions between different array types.
  67   std::unique_ptr<B[]> upB;
  68
  69   std::unique_ptr<const A[]> cA(std::move(upB));  // { dg-error "no matching function" }
  70   std::unique_ptr<volatile A[]> vA(std::move(upB)); // { dg-error "no matching function" }
  71   std::unique_ptr<const volatile A[]> cvA(std::move(upB)); // { dg-error "no matching function" }
  72 }