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// { dg-require-atomic-builtins "" }
// { dg-options "-std=gnu++11" }
// Copyright (C) 2012-2015 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/>.
#include <atomic>
#include <cstdlib> //std::abs
#include <testsuite_hooks.h>
// libstdc++/51811
// pointer arithimetic vs. atomic<_Tp*> specialization
int main(void)
{
bool test __attribute__((unused)) = true;
using namespace std;
typedef int value_type;
const size_t n = 2;
value_type value = 42;
atomic<value_type*> p, p2, p3;
// operator++
{
p = &value;
p2 = p++;
VERIFY (p != p2);
value_type* vp(p);
value_type* vp2(p2);
ptrdiff_t dist = reinterpret_cast<char*>(vp) - reinterpret_cast<char*>(vp2);
VERIFY ( std::abs(dist) == sizeof(value_type));
p = &value;
p3 = ++p;
VERIFY (p == p3);
}
// operator--
{
p = &value;
p2 = p--;
VERIFY (p != p2);
value_type* vp(p);
value_type* vp2(p2);
ptrdiff_t dist = reinterpret_cast<char*>(vp) - reinterpret_cast<char*>(vp2);
VERIFY ( std::abs(dist) == sizeof(value_type));
p = &value;
p3 = --p;
VERIFY (p == p3);
}
// operator+=
{
p = &value;
value_type* vp(p);
p+=n;
value_type* vp2(p);
ptrdiff_t dist = reinterpret_cast<char*>(vp) - reinterpret_cast<char*>(vp2);
VERIFY ( std::abs(dist) == sizeof(value_type) * n);
}
// operator-=
{
p = &value;
value_type* vp(p);
p-=n;
value_type* vp2(p);
ptrdiff_t dist = reinterpret_cast<char*>(vp) - reinterpret_cast<char*>(vp2);
VERIFY ( std::abs(dist) == sizeof(value_type) * n);
}
return 0;
}
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