c++: Add testcase for DR 2874

[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 20_util / is_empty / incomplete_neg.cc

// { dg-do compile { target c++11 } }

// Copyright (C) 2019-2024 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// Expect the compiler builtin to do the completeness check.
// { dg-error "incomplete type" "" { target *-*-* } 0 }

#include <type_traits>

class X;

void test01()
{
  std::is_empty<X>();		// { dg-error "required from here" }
}