libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2012 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <atomic>
  21 #include <cstdlib> //std::abs
  22 #include <testsuite_hooks.h>
  23
  24 // pointer arithimetic vs. atomic<void*>.
  25 // atomic<void*> vs. explicitly specialized w/o operators, like atomic_bool?
  26 int main(void)
  27 {
  28   // bool test __attribute__((unused)) = true;
  29
  30   using namespace std;
  31
  32   typedef int   value_type;
  33   const size_t n = 2;
  34   value_type value = 42;
  35   value_type* p = &value;
  36   void* vp = p;
  37   ptrdiff_t dist(0);
  38
  39   atomic<void*> a(vp);
  40
  41   // operator++
  42   void* vp2(a);
  43   a++;
  44   void* vp3(a);
  45   dist = reinterpret_cast<char*>(vp2) - reinterpret_cast<char*>(vp3);
  46   // VERIFY ( std::abs(dist) == sizeof(void*));
  47
  48   // operator--
  49   void* vp4(a);
  50   a--;
  51   void* vp5(a);
  52   dist = reinterpret_cast<char*>(vp4) - reinterpret_cast<char*>(vp5);
  53   // VERIFY ( std::abs(dist) == sizeof(void*));
  54
  55   // operator+=
  56   void* vp6(a);
  57   a+=n;
  58   void* vp7(a);
  59   dist = reinterpret_cast<char*>(vp6) - reinterpret_cast<char*>(vp7);
  60   // VERIFY ( std::abs(dist) == sizeof(void*) * n);
  61
  62   // operator-=
  63   void* vp8(a);
  64   a-=n;
  65   void* vp9(a);
  66   dist = reinterpret_cast<char*>(vp8) - reinterpret_cast<char*>(vp9);
  67   //VERIFY ( std::abs(dist) == sizeof(void*) * n);
  68
  69   return 0;
  70 }