libstdc++-v3/testsuite/29_atomics/atomic/is_always_lock_free.cc

   1 // Copyright (C) 2016-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do compile }
  20
  21 #include <atomic>
  22
  23 struct S { int s[64]; };
  24
  25 constexpr bool b1 = std::atomic<S>::is_always_lock_free;
  26 constexpr const bool* cktype1 = &std::atomic<S>::is_always_lock_free;
  27
  28 constexpr bool b2 = std::atomic<int*>::is_always_lock_free;
  29 constexpr const bool* cktype2 = &std::atomic<int*>::is_always_lock_free;
  30
  31 static_assert( std::atomic<int*>::is_always_lock_free
  32                 == (ATOMIC_POINTER_LOCK_FREE == 2) );