libstdc++-v3/testsuite/21_strings/char_traits/requirements/char16_t/eof.cc

   1 // Copyright (C) 2017-2021 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-do compile { target c++11 } }
  19
  20 #include <string>
  21
  22
  23 constexpr bool not_equal_to_eof(char16_t c)
  24 {
  25   using T = std::char_traits<char16_t>;
  26   return T::eq_int_type(T::eof(), T::to_int_type(c)) == false;
  27 }
  28
  29 // Last two code points of the BMP are noncharacters:
  30 static_assert(not_equal_to_eof(u'\uFFFE'), "U+FFFE compares unequal to eof");
  31 static_assert(not_equal_to_eof(u'\uFFFF'), "U+FFFF compares unequal to eof");