1// { dg-options "-mieee" { target alpha*-*-* } }
2
3// 1999-08-23 bkoz
4
5// Copyright (C) 1999, 2001, 2002 Free Software Foundation
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 2, 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 COPYING.  If not, write to the Free
20// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21// USA.
22
23// 18.2.1.1 template class numeric_limits
24
25#include <limits>
26#include <limits.h>
27#include <float.h>
28#include <cwchar>
29#include <testsuite_hooks.h>
30
31template<typename T>
32struct extrema {
33  static T min;
34  static T max;
35};
36
37
38#define DEFINE_EXTREMA(T, m, M) \
39  template<> T extrema<T>::min = m; \
40  template<> T extrema<T>::max = M
41
42DEFINE_EXTREMA(char, CHAR_MIN, CHAR_MAX);
43DEFINE_EXTREMA(signed char, SCHAR_MIN, SCHAR_MAX);
44DEFINE_EXTREMA(unsigned char, 0, UCHAR_MAX);
45DEFINE_EXTREMA(short, SHRT_MIN, SHRT_MAX);
46DEFINE_EXTREMA(unsigned short, 0, USHRT_MAX);
47DEFINE_EXTREMA(int, INT_MIN, INT_MAX);
48DEFINE_EXTREMA(unsigned, 0U, UINT_MAX);
49DEFINE_EXTREMA(long, LONG_MIN, LONG_MAX);
50DEFINE_EXTREMA(unsigned long, 0UL, ULONG_MAX);
51
52#if defined(_GLIBCPP_USE_WCHAR_T)
53DEFINE_EXTREMA(wchar_t, WCHAR_MIN, WCHAR_MAX);
54#endif //_GLIBCPP_USE_WCHAR_T
55
56DEFINE_EXTREMA(float, FLT_MIN, FLT_MAX);
57DEFINE_EXTREMA(double, DBL_MIN, DBL_MAX);
58DEFINE_EXTREMA(long double, LDBL_MIN, LDBL_MAX);
59
60#undef DEFINE_EXTREMA
61
62template<typename T>
63void test_extrema()
64{
65  bool test = true;
66  T limits_min = std::numeric_limits<T>::min();
67  T limits_max = std::numeric_limits<T>::max();
68  T extrema_min = extrema<T>::min;
69  T extrema_max = extrema<T>::max;
70  VERIFY( extrema_min == limits_min );
71  VERIFY( extrema_max == limits_max );
72}
73
74template<typename T>
75void test_epsilon()
76{
77  bool test = true;
78  T epsilon = std::numeric_limits<T>::epsilon();
79  T one = 1;
80
81  VERIFY( one != (one + epsilon) );
82}
83
84#ifdef __CHAR_UNSIGNED__
85#define char_is_signed false
86#else
87#define char_is_signed true
88#endif
89
90void test_sign()
91{
92  bool test = true;
93  VERIFY( std::numeric_limits<char>::is_signed == char_is_signed );
94  VERIFY( std::numeric_limits<signed char>::is_signed == true );
95  VERIFY( std::numeric_limits<unsigned char>::is_signed == false );
96  VERIFY( std::numeric_limits<short>::is_signed == true );
97  VERIFY( std::numeric_limits<unsigned short>::is_signed == false );
98  VERIFY( std::numeric_limits<int>::is_signed == true );
99  VERIFY( std::numeric_limits<unsigned>::is_signed == false );
100  VERIFY( std::numeric_limits<long>::is_signed == true );
101  VERIFY( std::numeric_limits<unsigned long>::is_signed == false );
102  VERIFY( std::numeric_limits<float>::is_signed == true );
103  VERIFY( std::numeric_limits<double>::is_signed == true );
104  VERIFY( std::numeric_limits<long double>::is_signed == true );
105}
106
107
108template<typename T>
109void
110test_infinity()
111{
112  bool test;
113
114  if (std::numeric_limits<T>::has_infinity)
115    {
116      T inf = std::numeric_limits<T>::infinity();
117      test = (inf + inf == inf);
118    }
119  else
120    test = true;
121
122  VERIFY (test);
123}
124
125template<typename T>
126void
127test_denorm_min()
128{
129  bool test;
130
131  if (std::numeric_limits<T>::has_denorm == std::denorm_present)
132    {
133      T denorm = std::numeric_limits<T>::denorm_min();
134      test = (denorm > 0);
135    }
136  else
137    test = true;
138
139  VERIFY (test);
140}
141
142template<typename T>
143void
144test_qnan()
145{
146  bool test;
147
148  if (std::numeric_limits<T>::has_quiet_NaN)
149    {
150      T nan = std::numeric_limits<T>::quiet_NaN();
151      test = (nan != nan);
152    }
153  else
154    test = true;
155
156  VERIFY (test);
157}
158
159
160template<typename T>
161void
162test_is_iec559()
163{
164  bool test;
165
166  if (std::numeric_limits<T>::is_iec559)
167    {
168      // IEC 559 requires all of the following.
169      test = (std::numeric_limits<T>::has_infinity
170	      && std::numeric_limits<T>::has_quiet_NaN
171	      && std::numeric_limits<T>::has_signaling_NaN);
172    }
173  else
174    {
175      // If we had all of the following, why didn't we set IEC 559?
176      test = (!std::numeric_limits<T>::has_infinity
177	      || !std::numeric_limits<T>::has_quiet_NaN
178	      || !std::numeric_limits<T>::has_signaling_NaN);
179    }
180
181  VERIFY (test);
182}
183
184
185template<typename T>
186  struct A
187  {
188    int key;
189  public:
190    A(int i = 0): key(i) { }
191    bool
192    operator==(int i) { return i == key; }
193  };
194
195struct B
196{
197  B(int i = 0) { }
198};
199
200
201bool test01()
202{
203  bool test = true;
204  std::numeric_limits< A<B> > obj;
205
206  VERIFY( !obj.is_specialized );
207  VERIFY( obj.min() == 0 );
208  VERIFY( obj.max() == 0 );
209  VERIFY( obj.digits ==  0 );
210  VERIFY( obj.digits10 == 0 );
211  VERIFY( !obj.is_signed );
212  VERIFY( !obj.is_integer );
213  VERIFY( !obj.is_exact );
214  VERIFY( obj.radix == 0 );
215  VERIFY( obj.epsilon() == 0 );
216  VERIFY( obj.round_error() == 0 );
217  VERIFY( obj.min_exponent == 0 );
218  VERIFY( obj.min_exponent10 == 0 );
219  VERIFY( obj.max_exponent == 0 );
220  VERIFY( obj.max_exponent10 == 0 );
221  VERIFY( !obj.has_infinity );
222  VERIFY( !obj.has_quiet_NaN );
223  VERIFY( !obj.has_signaling_NaN );
224  VERIFY( !obj.has_denorm );
225  VERIFY( !obj.has_denorm_loss );
226  VERIFY( obj.infinity() == 0 );
227  VERIFY( obj.quiet_NaN() == 0 );
228  VERIFY( obj.signaling_NaN() == 0 );
229  VERIFY( obj.denorm_min() == 0 );
230  VERIFY( !obj.is_iec559 );
231  VERIFY( !obj.is_bounded );
232  VERIFY( !obj.is_modulo );
233  VERIFY( !obj.traps );
234  VERIFY( !obj.tinyness_before );
235  VERIFY( obj.round_style == std::round_toward_zero );
236
237#ifdef DEBUG_ASSERT
238  assert(test);
239#endif
240
241  return test;
242}
243
244// test linkage of the generic bits
245template struct std::numeric_limits<B>;
246
247void test02()
248{
249  typedef std::numeric_limits<B> b_nl_type;
250
251  // Should probably do all of them...
252  const int* pi1 = &b_nl_type::digits;
253  const int* pi2 = &b_nl_type::digits10;
254  const int* pi3 = &b_nl_type::max_exponent10;
255  const bool* pb1 = &b_nl_type::traps;
256}
257
258// libstdc++/5045
259bool test03()
260{
261  bool test = true;
262
263  VERIFY( std::numeric_limits<bool>::digits10 == 0 );
264  if (__CHAR_BIT__ == 8)
265    {
266      VERIFY( std::numeric_limits<signed char>::digits10 == 2 );
267      VERIFY( std::numeric_limits<unsigned char>::digits10 == 2 );
268    }
269  if (__CHAR_BIT__ * sizeof(short) == 16)
270    {
271      VERIFY( std::numeric_limits<signed short>::digits10 == 4 );
272      VERIFY( std::numeric_limits<unsigned short>::digits10 == 4 );
273    }
274  if (__CHAR_BIT__ * sizeof(int) == 32)
275    {
276      VERIFY( std::numeric_limits<signed int>::digits10 == 9 );
277      VERIFY( std::numeric_limits<unsigned int>::digits10 == 9 );
278    }
279  if (__CHAR_BIT__ * sizeof(long long) == 64)
280    {
281      VERIFY( std::numeric_limits<signed long long>::digits10 == 18 );
282      VERIFY( std::numeric_limits<unsigned long long>::digits10 == 19 );
283    }
284
285#ifdef DEBUG_ASSERT
286  assert(test);
287#endif
288
289  return test;
290}
291
292// libstdc++/8949
293bool test04()
294{
295  bool test = true;
296
297  VERIFY( !std::numeric_limits<short>::is_iec559 );
298  VERIFY( !std::numeric_limits<unsigned short>::is_iec559 );
299  VERIFY( !std::numeric_limits<int>::is_iec559 );
300  VERIFY( !std::numeric_limits<unsigned int>::is_iec559 );
301  VERIFY( !std::numeric_limits<long>::is_iec559 );
302  VERIFY( !std::numeric_limits<unsigned long>::is_iec559 );
303  VERIFY( !std::numeric_limits<long long>::is_iec559 );
304  VERIFY( !std::numeric_limits<unsigned long long>::is_iec559 );
305
306#ifdef DEBUG_ASSERT
307  assert(test);
308#endif
309
310  return test;
311}
312
313int main()
314{
315  test01();
316  test02();
317  test03();
318  test04();
319
320  test_extrema<char>();
321  test_extrema<signed char>();
322  test_extrema<unsigned char>();
323
324  test_extrema<short>();
325  test_extrema<unsigned short>();
326
327  test_extrema<int>();
328  test_extrema<unsigned>();
329
330  test_extrema<long>();
331  test_extrema<unsigned long>();
332
333  test_extrema<float>();
334  test_extrema<double>();
335  test_extrema<long double>();
336
337  test_epsilon<float>();
338  test_epsilon<double>();
339  test_epsilon<long double>();
340
341  test_sign();
342
343  test_infinity<float>();
344  test_infinity<double>();
345  test_infinity<long double>();
346
347  test_denorm_min<float>();
348  test_denorm_min<double>();
349  test_denorm_min<long double>();
350
351  test_qnan<float>();
352  test_qnan<double>();
353  test_qnan<long double>();
354
355  // ??? How to test SNaN?  We'd perhaps have to be prepared
356  // to catch SIGFPE.  Can't rely on a signal getting through
357  // since the exception can be disabled in the FPU.
358
359  test_is_iec559<float>();
360  test_is_iec559<double>();
361  test_is_iec559<long double>();
362
363  return 0;
364}
365