gcc/libstdc++-v3/testsuite/23_containers/vector/59829.cc
Jonathan Wakely 8a972abdd9 re PR libstdc++/59829 (Calling vector::data() occurs undefined behavior when the vector is empty)
PR libstdc++/59829
	* include/bits/stl_vector.h (vector::data()): Call _M_data_ptr.
	(vector::_M_data_ptr): New overloaded functions to ensure empty
	vectors do not dereference the pointer.
	* testsuite/23_containers/vector/59829.cc: New.
	* testsuite/23_containers/vector/requirements/dr438/assign_neg.cc:
	Adjust dg-error line number.
	* testsuite/23_containers/vector/requirements/dr438/
	constructor_1_neg.cc: Likewise.
	* testsuite/23_containers/vector/requirements/dr438/
	constructor_2_neg.cc: Likewise.
	* testsuite/23_containers/vector/requirements/dr438/insert_neg.cc:
	Likewise.

From-SVN: r207241
2014-01-29 14:57:42 +00:00

68 lines
1.8 KiB
C++

// Copyright (C) 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/>.
// { dg-options "-std=gnu++11" }
// libstdc++/59829
#include <vector>
#include <testsuite_allocator.h>
// User-defined pointer type that throws if a null pointer is dereferenced.
template<typename T>
struct Pointer : __gnu_test::PointerBase<Pointer<T>, T>
{
using __gnu_test::PointerBase<Pointer<T>, T>::PointerBase;
T& operator*() const
{
if (!this->value)
throw "Dereferenced invalid pointer";
return *this->value;
}
};
// Minimal allocator using Pointer<T>
template<typename T>
struct Alloc
{
typedef T value_type;
typedef Pointer<T> pointer;
Alloc() = default;
template<typename U>
Alloc(const Alloc<U>&) { }
pointer allocate(std::size_t n)
{ return pointer(std::allocator<T>().allocate(n)); }
void deallocate(pointer p, std::size_t n)
{ std::allocator<T>().deallocate(p.value, n); }
};
template<typename T>
bool operator==(Alloc<T> l, Alloc<T> r) { return true; }
template<typename T>
bool operator!=(Alloc<T> l, Alloc<T> r) { return false; }
int main()
{
std::vector<int, Alloc<int>> a;
a.data();
}