libstdc++-v3/testsuite/20_util/unique_ptr/assign/cv_qual.cc

// { dg-options "-std=gnu++11" }
// { dg-do compile }

// Copyright (C) 2012-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// 20.7.1 Class template unique_ptr [unique.ptr]

#include <memory>

struct A { virtual ~A() = default; };

struct B : A { };

// Assignment from objects with different cv-qualification

void
test01()
{
  std::unique_ptr<A> upA;

  std::unique_ptr<const A> cA;
  cA = std::move(upA);
  std::unique_ptr<volatile A> vA;
  vA = std::move(upA);
  std::unique_ptr<const volatile A> cvA;
  cvA = std::move(upA);
}

void
test02()
{
  std::unique_ptr<B> upB;

  std::unique_ptr<const A> cA;
  cA = std::move(upB);
  std::unique_ptr<volatile A> vA;
  vA = std::move(upB);
  std::unique_ptr<const volatile A> cvA;
  cvA = std::move(upB);
}

void
test03()
{
  std::unique_ptr<A[]> upA;

  std::unique_ptr<const A[]> cA;
  cA = std::move(upA);
  std::unique_ptr<volatile A[]> vA;
  vA = std::move(upA);
  std::unique_ptr<const volatile A[]> cvA;
  cvA = std::move(upA);
}

struct A_pointer { operator A*() const { return nullptr; } };

template<typename T>
struct deleter
{
  deleter() = default;
  template<typename U>
    deleter(const deleter<U>) { }
  typedef T pointer;
  void operator()(T) const { }
};

void
test04()
{
  // Allow conversions from user-defined pointer-like types
  std::unique_ptr<B[], deleter<A_pointer>> p;
  std::unique_ptr<A[], deleter<A*>> upA;
  upA = std::move(p);
}