1 #ifndef __ISNAN_H__
2 #define __ISNAN_H__
4 /*
5 * Temporary fix for various misdefinitions of isnan().
6 * isnan() is becoming undef'd in some .h files.
7 * #include this last in your .cpp file to get it right.
8 *
9 * The problem is that isnan and isfinite are part of C99 but aren't part of
10 * the C++ standard (which predates C99).
11 *
12 * Authors:
13 * Inkscape groupies and obsessive-compulsives
14 *
15 * Copyright (C) 2004 authors
16 *
17 * Released under GNU GPL, read the file 'COPYING' for more information
18 *
19 * 2005 modification hereby placed in public domain. Probably supercedes the 2004 copyright
20 * for the code itself.
21 */
23 #include <math.h>
24 /* You might try changing the above to <cmath> if you have problems.
25 * Whether you use math.h or cmath, you may need to edit the .cpp file
26 * and/or other .h files to use the same header file.
27 */
29 #if defined(__isnan)
30 # define isNaN(_a) (__isnan(_a)) /* MacOSX/Darwin definition < 10.4 */
31 #elif defined(WIN32) || defined(_isnan)
32 # define isNaN(_a) (_isnan(_a)) /* Win32 definition */
33 #elif defined(isnan) || defined(__FreeBSD__) || defined(__osf__)
34 # define isNaN(_a) (isnan(_a)) /* GNU definition */
35 #else
36 # define isNaN(_a) (std::isnan(_a))
37 #endif
38 /* If the above doesn't work, then try (a != a).
39 * Also, please report a bug as per http://www.inkscape.org/report_bugs.php,
40 * giving information about what platform and compiler version you're using.
41 */
44 #if defined(__isfinite)
45 # define isFinite(_a) (__isfinite(_a)) /* MacOSX/Darwin definition < 10.4 */
46 #elif defined(__sgi)
47 # define isFinite(_a) (_isfinite(_a))
48 #elif defined(isfinite)
49 # define isFinite(_a) (isfinite(_a))
50 #elif defined(__osf__)
51 # define isFinite(_a) (finite(_a) && !isNaN(_a))
52 #else
53 # define isFinite(_a) (std::isfinite(_a))
54 #endif
55 /* If the above doesn't work, then try (finite(_a) && !isNaN(_a)) or (!isNaN((_a) - (_a))).
56 * Also, please report a bug as per http://www.inkscape.org/report_bugs.php,
57 * giving information about what platform and compiler version you're using.
58 */
61 #endif /* __ISNAN_H__ */