libstdc++-v3/testsuite/20_util/tuple/requirements/dr2367.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2015-2020 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 <tuple>
  21 #include <type_traits>
  22
  23 // DR 2367, pair and tuple are not correctly implemented for is_constructible with no args
  24 void test_default_constructible()
  25 {
  26   struct X
  27   {
  28     X() = delete;
  29   };
  30
  31   typedef std::tuple<int, X> T;
  32   static_assert(!std::is_constructible<T>::value, "");
  33   static_assert(!std::is_default_constructible<T>::value, "");
  34
  35   typedef std::tuple<int, int, X> T2;
  36   static_assert(!std::is_constructible<T2>::value, "");
  37   static_assert(!std::is_default_constructible<T2>::value, "");
  38
  39
  40 }
  41
  42 int main()
  43 {
  44   test_default_constructible();
  45   return 0;
  46 }