libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc

   1 // Copyright (C) 2019-2020 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++2a" }
  19 // { dg-do compile { target c++2a } }
  20
  21 #include <atomic>
  22
  23 void
  24 test01()
  25 {
  26   int i = 0;
  27   std::atomic_ref a0(i);
  28   static_assert(std::is_same_v<decltype(a0), std::atomic_ref<int>>);
  29
  30   float f = 1.0f;
  31   std::atomic_ref a1(f);
  32   static_assert(std::is_same_v<decltype(a1), std::atomic_ref<float>>);
  33
  34   int* p = &i;
  35   std::atomic_ref a2(p);
  36   static_assert(std::is_same_v<decltype(a2), std::atomic_ref<int*>>);
  37
  38   struct X { } x;
  39   std::atomic_ref a3(x);
  40   static_assert(std::is_same_v<decltype(a3), std::atomic_ref<X>>);
  41 }