Improve precondition checks for std::span

[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 23_containers / span / subspan_4_assert_neg.cc

// Copyright (C) 2019 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/>.

// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }

#define _GLIBCXX_ASSERTIONS
#include <span>

int main()
{
  int a[4];
  std::span<int, std::dynamic_extent> s(a);
  s.subspan(5, 0);
}