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// { dg-require-atomic-builtins "" }

// { dg-options "-std=gnu++0x" }

// Copyright (C) 2012 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)

{

  // bool test __attribute__((unused)) = true;

  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 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) == sizeof(void*));

  // operator--

  void* vp4(a);

  a--;

  void* vp5(a);

  dist = reinterpret_cast<char*>(vp4) - reinterpret_cast<char*>(vp5);

  // VERIFY ( std::abs(dist) == sizeof(void*));

  // operator+=

  void* vp6(a);

  a+=n;

  void* vp7(a);

  dist = reinterpret_cast<char*>(vp6) - reinterpret_cast<char*>(vp7);

  // VERIFY ( std::abs(dist) == sizeof(void*) * n);

  // operator-=

  void* vp8(a);

  a-=n;

  void* vp9(a);

  dist = reinterpret_cast<char*>(vp8) - reinterpret_cast<char*>(vp9);

  //VERIFY ( std::abs(dist) == sizeof(void*) * n);

  return 0;

}