test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.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: with_system_cxx_lib=x86_64-apple-macosx10.7
  15 // XFAIL: with_system_cxx_lib=x86_64-apple-macosx10.8
  16
  17 // <memory>
  18
  19 // shared_ptr
  20
  21 // template <class T>
  22 // bool
  23 // atomic_compare_exchange_strong_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
  24 //                                         shared_ptr<T> w, memory_order success,
  25 //                                         memory_order failure);
  26
  27 // UNSUPPORTED: c++98, c++03
  28
  29 #include <memory>
  30 #include <cassert>
  31
  32 #include "test_macros.h"
  33
  34 int main()
  35 {
  36     {
  37         std::shared_ptr<int> p(new int(4));
  38         std::shared_ptr<int> v(new int(3));
  39         std::shared_ptr<int> w(new int(2));
  40         bool b = std::atomic_compare_exchange_strong_explicit(&p, &v, w,
  41                                                               std::memory_order_seq_cst,
  42                                                               std::memory_order_seq_cst);
  43         assert(b == false);
  44         assert(*p == 4);
  45         assert(*v == 4);
  46         assert(*w == 2);
  47     }
  48     {
  49         std::shared_ptr<int> p(new int(4));
  50         std::shared_ptr<int> v = p;
  51         std::shared_ptr<int> w(new int(2));
  52         bool b = std::atomic_compare_exchange_strong_explicit(&p, &v, w,
  53                                                               std::memory_order_seq_cst,
  54                                                               std::memory_order_seq_cst);
  55         assert(b == true);
  56         assert(*p == 2);
  57         assert(*v == 4);
  58         assert(*w == 2);
  59     }
  60 }