On Thu, May 23, 2013 at 2:04 AM, Antoine Pitrou <[email protected]> wrote:
> On Thu, 23 May 2013 12:12:26 +1000
> Nick Coghlan <[email protected]> wrote:
>> The binary operators can be more accurately said to use a complicated
>> single-dispatch dance rather than supporting native dual-dispatch.
>
> Not one based on the type of a single argument, though.
Why not?
I'd expect it to look something like this:
@singledispatch
def ladd(left, right):
return NotImplemented
@singledispatch
def radd(right, left):
return NotImplemented
def add(left, right):
x = ladd(left, right)
if x is not NotImplemented:
return x
x = radd(right, left)
if x is not NotImplemented:
return x
raise TypeError
Then instead of defining __add__ you define an overloaded
implementation of ladd, and instead of defining __radd__ you define an
overloaded implementation of radd.
-- Devin
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