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// { dg-do run { target c++11 } }
// { dg-require-atomic-builtins "" }
// Copyright (C) 2012-2016 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>
// pointer arithimetic vs. atomic<void*>.
// atomic<void*> vs. explicitly specialized w/o operators, like atomic_bool?
int main(void)
{
using namespace std;
typedef int value_type;
const size_t n = 2;
value_type value = 42;
value_type* p = &value;
void* vp = p;
ptrdiff_t __attribute__((unused)) dist(0);
atomic<void*> a(vp);
// operator++
void* vp2(a);
a++;
void* vp3(a);
dist = reinterpret_cast<char*>(vp2) - reinterpret_cast<char*>(vp3);
VERIFY ( std::abs(dist) == 1 );
// operator--
void* vp4(a);
a--;
void* vp5(a);
dist = reinterpret_cast<char*>(vp4) - reinterpret_cast<char*>(vp5);
VERIFY ( std::abs(dist) == 1 );
// operator+=
void* vp6(a);
a+=n;
void* vp7(a);
dist = reinterpret_cast<char*>(vp6) - reinterpret_cast<char*>(vp7);
VERIFY ( std::abs(dist) == n );
// operator-=
void* vp8(a);
a-=n;
void* vp9(a);
dist = reinterpret_cast<char*>(vp8) - reinterpret_cast<char*>(vp9);
VERIFY ( std::abs(dist) == n );
return 0;
}
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