On 2005-07-22 15:57:03 +0100 Adrian Robert <[EMAIL PROTECTED]> wrote:
This really seems like a hack (not that it's any worse than the current
state
:). Couldn't the implementations of -hash and -isEqual be aligned without
this loss of information? E.g. something like [warning, sloppy
first-attempt
code here]:
-isEqual:other
return abs(selfVal - other->selfVal) < epsilon;
-hash
return selfVal / epsilon;
(or maybe (selfVal + epsilon/2.0) / epsilon)
No ... each NSDate has to have its own independent hash ... but (following
the OpenStep spec) dates are equal if they are within a second of each
other.
That means that with dates d1, d2, d3 which have offsets from the reference
date of 0.0, 0.7 and 1.4 seconds,
d1 is eqal to d2 and d2 is equal to d3 but d1 is not equal to d3 ... a
rather counterintuitive behavior!
So ... as long as we stick to the OpenStep spec, we can't use dates as
dictionary keys.
I think we should move with MacOS-X here rather than sticking to OpenStep.
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