[Ironpython-users] Implicit conversion of objects to float

[Cesar Mello]

OK thank you very much!

Best regards
Mello

On Fri, Feb 24, 2012 at 6:17 PM, Jeff Hardy <jdhardy at gmail.com> wrote:

> On Fri, Feb 24, 2012 at 12:00 PM, Cesar Mello <cmello at gmail.com> wrote:
> > Thank you very much for the quick response Jeff!
> >
> > First, let me clarify I am a Python newbie, so my assumptions about
> Python
> > may be all wrong.
> >
> > I had tried __float__ in a Python object, but it does not work implicitly
> > inside expressions (and I think that's the correct behavior). You still
> have
> > to use float(a) for the conversion to be used.
> >
> > Now I implemented the C# implicit conversion to double() and I get the
> same
> > behavior (it works if I use float(a) in the expression but if I use a *
> 5.0
> > for example I get the error: "unsupported operand type(s) for *:
> 'DataValue'
> > and 'float'.
>
> Ah, you missed this first part: you'll need to overload the arithmetic
> operators for your objects.
>
> Python: Define __add__, __sub__, etc.
> (http://docs.python.org/reference/datamodel.html#object.__add__)
> C#: Define operator+, operator-, etc.
> (http://msdn.microsoft.com/en-us/library/aa288467(v=vs.71).aspx)
>
> - Jeff
>
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