libstdc++-v3/testsuite/20_util/is_constructible/51185.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2011-2022 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <type_traits>
  21
  22 struct A { };
  23 struct B : A {
  24 #if __cpp_aggregate_bases && __cpp_aggregate_paren_init
  25   // A user-declared constructor prevents B from being an aggregate.
  26   // Otherwise 'B&& b{A{}};' becomes valid in C++17 (__cpp_aggregate_bases),
  27   // and 'B&& b(A{});' becomes valid in C++17 (__cpp_aggregate_paren_init).
  28   B();
  29 #endif
  30 };
  31
  32 // libstdc++/51185
  33 void f()
  34 {
  35   static_assert(!std::is_constructible<B &&, A>(), "");
  36   static_assert(!std::is_constructible<B const &&, A>(), "");
  37   static_assert(!std::is_constructible<B const &&, A const>(), "");
  38   static_assert(!std::is_constructible<B volatile &&, A>(), "");
  39   static_assert(!std::is_constructible<B volatile &&, A volatile>(), "");
  40   static_assert(!std::is_constructible<B const volatile &&, A>(), "");
  41   static_assert(!std::is_constructible<B const volatile &&, A const>(), "");
  42   static_assert(!std::is_constructible<B const volatile &&, A volatile>(), "");
  43   static_assert(!std::is_constructible<B const volatile &&,
  44                 A const volatile>(), "");
  45 }