libstdc++-v3/testsuite/29_atomics/headers/atomic/types_std_c++2a_neg.cc

   1 // { dg-do compile { target c++20 } }
   2 // Disable PCH because <bits/stdc++.h> includes <stdatomic.h> which declares
   3 // memory_order in the global namespace.
   4 // { dg-add-options no_pch }
   5
   6 // Copyright (C) 2019-2024 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <atomic>
  24
  25 void test01()
  26 {
  27   // Not global scoped, only namespace std.
  28   using ::memory_order; // { dg-error "has not been declared" }
  29   constexpr auto relaxed = memory_order::relaxed; // { dg-error "has not been declared" }
  30   constexpr auto consume = memory_order::consume; // { dg-error "has not been declared" }
  31   constexpr auto acquire = memory_order::acquire; // { dg-error "has not been declared" }
  32   constexpr auto release = memory_order::release; // { dg-error "has not been declared" }
  33   constexpr auto acq_rel = memory_order::acq_rel; // { dg-error "has not been declared" }
  34   constexpr auto seq_cst = memory_order::seq_cst; // { dg-error "has not been declared" }
  35 }