test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // UNSUPPORTED: libcpp-has-no-threads
  11 //
  12 // This test uses new symbols that were not defined in the libc++ shipped on
  13 // darwin11 and darwin12:
  14 // XFAIL: availability=macosx10.7
  15 // XFAIL: availability=macosx10.8
  16
  17 // <memory>
  18
  19 // shared_ptr
  20
  21 // template <class T>
  22 // bool
  23 // atomic_compare_exchange_strong(shared_ptr<T>* p, shared_ptr<T>* v,
  24 //                                shared_ptr<T> w);
  25
  26 // UNSUPPORTED: c++98, c++03
  27
  28 #include <memory>
  29 #include <cassert>
  30
  31 #include "test_macros.h"
  32
  33 int main()
  34 {
  35     {
  36         std::shared_ptr<int> p(new int(4));
  37         std::shared_ptr<int> v(new int(3));
  38         std::shared_ptr<int> w(new int(2));
  39         bool b = std::atomic_compare_exchange_strong(&p, &v, w);
  40         assert(b == false);
  41         assert(*p == 4);
  42         assert(*v == 4);
  43         assert(*w == 2);
  44     }
  45     {
  46         std::shared_ptr<int> p(new int(4));
  47         std::shared_ptr<int> v = p;
  48         std::shared_ptr<int> w(new int(2));
  49         bool b = std::atomic_compare_exchange_strong(&p, &v, w);
  50         assert(b == true);
  51         assert(*p == 2);
  52         assert(*v == 4);
  53         assert(*w == 2);
  54     }
  55 }