libstdc++-v3/testsuite/std/ranges/iota/lwg3292_neg.cc

   1 // Copyright (C) 2020-2022 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 // { dg-require-effective-target hosted }
  21
  22 #include <sstream>
  23 #include <ranges>
  24
  25 namespace ranges = std::ranges;
  26 namespace views = std::views;
  27
  28 void
  29 test01()
  30 {
  31   std::istringstream s("1 2 3 4 5");
  32   auto v = ranges::istream_view<int>(s);
  33   auto i = v.begin();
  34   static_assert(!std::semiregular<decltype(i)>);
  35   auto o = views::iota(std::move(i));
  36   static_assert(false); // { dg-error "" }
  37 }
  38
  39 // { dg-prune-output "no match" }
  40 // { dg-prune-output "deduction failed" }
  41 // { dg-prune-output "constraint failure" }