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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 21_strings / basic_string_view / element_access / char / front_constexpr_neg.cc

// Copyright (C) 2020-2021 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++17 -D_GLIBCXX_ASSERTIONS" }
// { dg-do compile { target c++17 xfail *-*-* } }

#include <string_view>

typedef std::string_view string_view_type;

constexpr char
front()
{
  string_view_type s("");
  return s.front();
}

static_assert(front() != 'a'); // { dg-error "non-constant condition" }

// { dg-prune-output "in 'constexpr' expansion" }
// { dg-prune-output "failed_assertion" }