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| author | Lars Knoll <lars.knoll@nokia.com> | 2009-03-29 19:47:53 (GMT) |
|---|---|---|
| committer | Bjoern Erik Nilsen <bjorn.nilsen@nokia.com> | 2009-04-07 13:51:08 (GMT) |
| commit | fde7f3d03782c801901f511131458d6fcb1021a5 (patch) | |
| tree | a42fa854efaa38ba7dddafbd909696f4f7e15210 /src/corelib | |
| parent | baf61b32cf4aa554ee3dbb4a22b99e854d5ebd34 (diff) | |
| download | Qt-fde7f3d03782c801901f511131458d6fcb1021a5.zip Qt-fde7f3d03782c801901f511131458d6fcb1021a5.tar.gz Qt-fde7f3d03782c801901f511131458d6fcb1021a5.tar.bz2 | |
Add an internal qIsFuzzyNull(double) method
The method can help to avoid many calls to the rather
expensive qFuzzyCompare in the cases where we compare
a number against 0 or 1.
Diffstat (limited to 'src/corelib')
| -rw-r--r-- | src/corelib/global/qglobal.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h index 672862a..28b9d08 100644 --- a/src/corelib/global/qglobal.h +++ b/src/corelib/global/qglobal.h @@ -1706,6 +1706,22 @@ static inline bool qFuzzyCompare(float p1, float p2) return (qAbs(p1 - p2) <= 0.00001f * qMin(qAbs(p1), qAbs(p2))); } +/*! + \internal +*/ +static inline bool qIsFuzzyNull(double d) +{ + return qAbs(d) <= 0.000000000001; +} + +/*! + \internal +*/ +static inline bool qIsFuzzyNull(float f) +{ + return qAbs(f) <= 0.00001f; +} + /* This function tests a double for a null value. It doesn't check whether the actual value is 0 or close to 0, but whether |