libstdc++-v3/testsuite/21_strings/char_traits/requirements/char/99181.cc

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2021-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <string>
  21 #include <testsuite_hooks.h>
  22
  23 void test01()
  24 {
  25   const char *a = "\x7f";
  26   const char *b = "\x80";
  27   int c = std::char_traits<char>::compare(a, b, 2);
  28   constexpr int d = std::char_traits<char>::compare("\x7f", "\x80", 2);
  29
  30   VERIFY( c && (c < 0) == (static_cast<unsigned char>(a[0])
  31                            < static_cast<unsigned char>(b[0])) );
  32   VERIFY( d && (c < 0) == (d < 0) );
  33 }
  34
  35 int main()
  36 {
  37   test01();
  38   return 0;
  39 }