libstdc++-v3/testsuite/18_support/numeric_limits/quiet_NaN.cc

   1 // { dg-add-options ieee }
   2
   3 // 1999-08-23 bkoz
   4
   5 // Copyright (C) 1999-2013 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 // 18.2.1.1 template class numeric_limits
  23
  24 #include <limits>
  25 #include <limits.h>
  26 #include <float.h>
  27 #include <cwchar>
  28 #include <testsuite_hooks.h>
  29
  30 template<typename T>
  31 void
  32 test_qnan()
  33 {
  34   bool test;
  35
  36   if (std::numeric_limits<T>::has_quiet_NaN)
  37     {
  38       T nan = std::numeric_limits<T>::quiet_NaN();
  39       test = (nan != nan);
  40     }
  41   else
  42     test = true;
  43
  44   VERIFY (test);
  45 }
  46
  47 int main()
  48 {
  49   test_qnan<float>();
  50   test_qnan<double>();
  51   test_qnan<long double>();
  52
  53   return 0;
  54 }