libstdc++-v3/testsuite/20_util/unique_ptr/cons/lwg2905.cc

// Copyright (C) 2017-2021 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/>.

// { dg-do compile { target c++11 } }

#include <memory>

template<typename T, typename D, typename P, typename E>
constexpr bool check()
{ return std::is_constructible<std::unique_ptr<T, D>, P, E>::value; }

struct Del { void operator()(void*) const { } };

static_assert( ! check<int, Del&, int*, Del>(), "" );
static_assert( check<int, Del&, int*, Del&>(), "" );
static_assert( check<int, const Del&, int*, Del&>(), "" );
static_assert( ! check<int, Del&, int*, const Del&>(), "" );
static_assert( check<int, Del, int*, const Del&>(), "" );
static_assert( check<int, Del, int*, Del>(), "" );

static_assert( ! check<int[], Del&, int*, Del>(), "" );
static_assert( check<int[], Del&, int*, Del&>(), "" );
static_assert( check<int[], const Del&, int*, Del&>(), "" );
static_assert( ! check<int[], Del&, int*, const Del&>(), "" );
static_assert( check<int[], Del, int*, const Del&>(), "" );
static_assert( check<int[], Del, int*, Del>(), "" );

struct DelNoCopy {
  DelNoCopy() = default;
  DelNoCopy(const DelNoCopy&) = delete;
  DelNoCopy(DelNoCopy&&) = default;
  void operator()(void*) const { }
};

static_assert( ! check<int, DelNoCopy&, int*, DelNoCopy>(), "" );
static_assert( check<int, DelNoCopy&, int*, DelNoCopy&>(), "" );
static_assert( check<int, const DelNoCopy&, int*, DelNoCopy&>(), "" );
static_assert( ! check<int, DelNoCopy&, int*, const DelNoCopy&>(), "" );
static_assert( ! check<int, DelNoCopy, int*, const DelNoCopy&>(), "" );
static_assert( check<int, DelNoCopy, int*, DelNoCopy>(), "" );

static_assert( ! check<int[], DelNoCopy&, int*, DelNoCopy>(), "" );
static_assert( check<int[], DelNoCopy&, int*, DelNoCopy&>(), "" );
static_assert( check<int[], const DelNoCopy&, int*, DelNoCopy&>(), "" );
static_assert( ! check<int[], DelNoCopy&, int*, const DelNoCopy&>(), "" );
static_assert( ! check<int[], DelNoCopy, int*, const DelNoCopy&>(), "" );
static_assert( check<int[], DelNoCopy, int*, DelNoCopy>(), "" );

struct Base { virtual ~Base() { } };
struct Derived : Base { };

static_assert( ! check<Base[], Del&, Base*, Del>(), "" );
static_assert( check<Base[], Del&, Base*, Del&>(), "" );
static_assert( check<Base[], const Del&, Base*, Del&>(), "" );
static_assert( ! check<Base[], Del&, Base*, const Del&>(), "" );
static_assert( check<Base[], Del, Base*, const Del&>(), "" );
static_assert( check<Base[], Del, Base*, Del>(), "" );

static_assert( ! check<Base[], Del&, Derived*, Del>(), "" );
static_assert( ! check<Base[], Del&, Derived*, Del&>(), "" );
static_assert( ! check<Base[], const Del&, Derived*, Del&>(), "" );
static_assert( ! check<Base[], Del&, Derived*, const Del&>(), "" );
static_assert( ! check<Base[], Del, Derived*, const Del&>(), "" );
static_assert( ! check<Base[], Del, Derived*, Del>(), "" );