Re: CGFloat and 64 Bit
Re: CGFloat and 64 Bit
- Subject: Re: CGFloat and 64 Bit
- From: Michael Ash <email@hidden>
- Date: Mon, 9 Feb 2009 20:26:18 -0500
On Mon, Feb 9, 2009 at 2:11 PM, Steve Sisak <email@hidden> wrote:
> At 12:41 PM -0500 2/9/09, Michael Ash wrote:
>>
>> > A very bad idea as it would force usage of float in 64bits applications
>>>
>>> where NSSize expect 64 bits CGFloat.
>>
>> So? Float converts to double just fine. There are no bad consequences
>> for passing 11.2f to a function that takes double, aside from an
>> utterly negligible loss of precision when representing the fractional
>> part.
>
> It depends if you care about that precision.
>
> Remember that base 10 is not precisely represented in base 2.
Yes, of course, that would be why I pointed it out.
If you're doing graphics, the precision difference is negligible. This
is borne out by the fact that Cocoa 32-bit does all graphics with
float, not double. If you can't withstand the extremely minor
precision loss of using 11.2f in your 64-bit code, then your 32-bit
code is never going to work in the first place.
Mike
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