// Copyright (C) 2017-2020 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
// .
// { dg-do run { target c++11 } }
// libstdc++/80893
#include
#include
struct DereferencedInvalidPointer { };
// User-defined pointer type that throws if a null pointer is dereferenced.
template
struct Pointer : __gnu_test::PointerBase, T>
{
using __gnu_test::PointerBase, T>::PointerBase;
T& operator*() const
{
if (!this->value)
throw DereferencedInvalidPointer();
return *this->value;
}
};
// Minimal allocator using Pointer
template
struct Alloc
{
typedef T value_type;
typedef Pointer pointer;
Alloc() = default;
template
Alloc(const Alloc&) { }
pointer allocate(std::size_t n)
{
if (n)
return pointer(std::allocator().allocate(n));
return nullptr;
}
void deallocate(pointer p, std::size_t n)
{
if (n)
std::allocator().deallocate(p.operator->(), n);
}
};
template
bool operator==(Alloc, Alloc) { return true; }
template
bool operator!=(Alloc, Alloc) { return false; }
int main()
{
std::vector> v(0);
std::vector> w(v);
}