math/test-math-iszero.cc

   1 /* Test for the C++ implementation of iszero.
   2    Copyright (C) 2016-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #define _GNU_SOURCE 1
  20 #include <math.h>
  21 #include <stdio.h>
  22
  23 #include <limits>
  24
  25 static bool errors;
  26
  27 static void
  28 check (int actual, int expected, const char *actual_expr, int line)
  29 {
  30   if (actual != expected)
  31     {
  32       errors = true;
  33       printf ("%s:%d: error: %s\n", __FILE__, line, actual_expr);
  34       printf ("%s:%d:   expected: %d\n", __FILE__, line, expected);
  35       printf ("%s:%d:   actual: %d\n", __FILE__, line, actual);
  36     }
  37 }
  38
  39 #define CHECK(actual, expected) \
  40   check ((actual), (expected), #actual, __LINE__)
  41
  42 template <class T>
  43 static void
  44 check_type ()
  45 {
  46   typedef std::numeric_limits<T> limits;
  47   CHECK (iszero (T{}), 1);
  48   CHECK (iszero (T{0}), 1);
  49   CHECK (iszero (T{-0.0}), 1);
  50   CHECK (iszero (T{1}), 0);
  51   CHECK (iszero (T{-1}), 0);
  52   CHECK (iszero (limits::min ()), 0);
  53   CHECK (iszero (-limits::min ()), 0);
  54   CHECK (iszero (limits::max ()), 0);
  55   CHECK (iszero (-limits::max ()), 0);
  56   if (limits::has_infinity)
  57     {
  58       CHECK (iszero (limits::infinity ()), 0);
  59       CHECK (iszero (-limits::infinity ()), 0);
  60     }
  61   CHECK (iszero (limits::epsilon ()), 0);
  62   CHECK (iszero (-limits::epsilon ()), 0);
  63   if (limits::has_quiet_NaN)
  64     CHECK (iszero (limits::quiet_NaN ()), 0);
  65   if (limits::has_signaling_NaN)
  66     CHECK (iszero (limits::signaling_NaN ()), 0);
  67   if (limits::has_signaling_NaN)
  68     CHECK (iszero (limits::signaling_NaN ()), 0);
  69   CHECK (iszero (limits::denorm_min ()),
  70          std::numeric_limits<T>::has_denorm == std::denorm_absent);
  71   CHECK (iszero (-limits::denorm_min ()),
  72          std::numeric_limits<T>::has_denorm == std::denorm_absent);
  73 }
  74
  75 static int
  76 do_test (void)
  77 {
  78   check_type<float> ();
  79   check_type<double> ();
  80   check_type<long double> ();
  81   return errors;
  82 }
  83
  84 #define TEST_FUNCTION do_test ()
  85 #include "../test-skeleton.c"