libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.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   struct X { int c; };
  27   using A = std::atomic_ref<X>;
  28   static_assert( std::is_standard_layout_v<A> );
  29   static_assert( std::is_nothrow_copy_constructible_v<A> );
  30   static_assert( std::is_trivially_destructible_v<A> );
  31   static_assert( std::is_same_v<A::value_type, X> );
  32   static_assert( !std::is_copy_assignable_v<A> );
  33   static_assert( !std::is_move_assignable_v<A> );
  34 }
  35
  36 void
  37 test02()
  38 {
  39   using A = std::atomic_ref<int>;
  40   static_assert( std::is_standard_layout_v<A> );
  41   static_assert( std::is_nothrow_copy_constructible_v<A> );
  42   static_assert( std::is_trivially_destructible_v<A> );
  43   static_assert( std::is_same_v<A::value_type, int> );
  44   static_assert( std::is_same_v<A::difference_type, A::value_type> );
  45   static_assert( !std::is_copy_assignable_v<A> );
  46   static_assert( !std::is_move_assignable_v<A> );
  47 }
  48
  49 void
  50 test03()
  51 {
  52   using A = std::atomic_ref<double>;
  53   static_assert( std::is_standard_layout_v<A> );
  54   static_assert( std::is_nothrow_copy_constructible_v<A> );
  55   static_assert( std::is_trivially_destructible_v<A> );
  56   static_assert( std::is_same_v<A::value_type, double> );
  57   static_assert( std::is_same_v<A::difference_type, A::value_type> );
  58   static_assert( !std::is_copy_assignable_v<A> );
  59   static_assert( !std::is_move_assignable_v<A> );
  60 }
  61
  62 void
  63 test04()
  64 {
  65   using A = std::atomic_ref<int*>;
  66   static_assert( std::is_standard_layout_v<A> );
  67   static_assert( std::is_nothrow_copy_constructible_v<A> );
  68   static_assert( std::is_trivially_destructible_v<A> );
  69   static_assert( std::is_same_v<A::value_type, int*> );
  70   static_assert( std::is_same_v<A::difference_type, std::ptrdiff_t> );
  71   static_assert( std::is_nothrow_copy_constructible_v<A> );
  72   static_assert( !std::is_copy_assignable_v<A> );
  73   static_assert( !std::is_move_assignable_v<A> );
  74 }