Re: [Pyobjc-dev] NSDecimalNumber to the next level

[Ronald O. <ous...@ci...>]

On 9-mrt-04, at 18:02, Pierce T.Wetter III wrote:

>
>
>  I want to take NSDecimalNumber to the next level.
>
>  History:
>
>   1.0.
>
>    NSDecimalNumber is wrapped as identical to CFNumber, which turns 
> out not work.
>
>   1.1
>
>    NSDecimalNumbers are passed through untransformed, you can use:
>
>   dv=obj.doubleValue() to convert them to Python doubles, then:
>
>    NSDecimalNumber.numberWithDouble(dv) to convert them back. This had 
> to happen because the type information was getting lost, and the 
> values passed back to Objective-C were plain CFNumber classes, which 
> didn't implement NSDecimalNumber.decimalNumberByAdding_(dv), etc.

The type info should not get lost, NSDecimalNumber and NSDecimal (the C 
type backing the NSDecimalNumber class) should work correctly as 
numbers, including save coercions. I explicitly disabled implicit 
coercion from NSDecimal{Number,} to and from float because you might 
loose precision that way.

If this doesn't work you found a bug that should be fixed.

Ronald