| // { dg-require-atomic-builtins "" } |
| // { dg-options "-std=gnu++0x" } |
| |
| // Copyright (C) 2012-2013 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; |
| } |