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isnan.h
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#ifndef __ISNAN_H__
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#define __ISNAN_H__
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/*
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* Temporary fix for various misdefinitions of isnan().
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* isnan() is becoming undef'd in some .h files.
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* #include this last in your .cpp file to get it right.
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*
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* The problem is that isnan and isfinite are part of C99 but aren't part of
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* the C++ standard (which predates C99).
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*
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* Authors:
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* Inkscape groupies and obsessive-compulsives
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*
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* Copyright (C) 2004 authors
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*
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* Released under GNU GPL, read the file 'COPYING' for more information
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*
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* 2005 modification hereby placed in public domain. Probably supercedes the 2004 copyright
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* for the code itself.
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*/
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#include <cmath>
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#include <float.h>
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/* You might try changing the above to <cmath> if you have problems.
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* Whether you use math.h or cmath, you may need to edit the .cpp file
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* and/or other .h files to use the same header file.
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*/
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#if defined(__isnan)
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# define is_nan(_a) (__isnan(_a))
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#elif defined(__APPLE__) && __GNUC__ == 3
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# define is_nan(_a) (__isnan(_a))
/* MacOSX/Darwin definition < 10.4 */
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#elif defined(WIN32) || defined(_isnan)
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# define is_nan(_a) (_isnan(_a))
/* Win32 definition */
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#elif defined(isnan) || defined(__FreeBSD__)
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# define is_nan(_a) (isnan(_a))
/* GNU definition */
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#else
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# define is_nan(_a) (std::isnan(_a))
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#endif
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/* If the above doesn't work, then try (a != a).
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* Also, please report a bug as per http://www.inkscape.org/report_bugs.php,
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* giving information about what platform and compiler version you're using.
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*/
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#if defined(__isfinite)
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# define is_finite(_a) (__isfinite(_a))
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#elif defined(__APPLE__) && __GNUC__ == 3
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# define is_finite(_a) (__isfinite(_a))
/* MacOSX/Darwin definition < 10.4 */
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#elif defined(isfinite)
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# define is_finite(_a) (isfinite(_a))
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#elif defined(_MSC_VER)
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# define is_finite(_a) (_finite(_a) && !_isnan(_a))
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#else
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# define is_finite(_a) (std::isfinite(_a))
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#endif
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/* If the above doesn't work, then try (finite(_a) && !isNaN(_a)) or (!isNaN((_a) - (_a))).
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* Also, please report a bug as per http://www.inkscape.org/report_bugs.php,
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* giving information about what platform and compiler version you're using.
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*/
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#endif
/* __ISNAN_H__ */
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isnan.h
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