libstdc++-v3/testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr_neg.cc

   1 // Copyright (C) 2020 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++17 -D_GLIBCXX_ASSERTIONS" }
  19 // { dg-do compile { target c++17 xfail *-*-* } }
  20
  21 #include <string_view>
  22
  23 constexpr wchar_t
  24 test()
  25 {
  26   typedef std::wstring_view string_view_type;
  27   string_view_type s(L"abcd");
  28   return s[4];
  29 }
  30
  31 static_assert(test() == 0); // { dg-error "non-constant condition" }
  32
  33 // { dg-prune-output "in 'constexpr' expansion" }
  34 // { dg-prune-output "failed_assertion" }