[PEAK] generic functions question

[Phillip J. Eby]

At 06:14 PM 11/18/04 +0200, Vladimir Iliev wrote:
>Hi,
>
>I have an use case like this:
>
>import dispatch
>[dispatch.generic()]
>def f(arg):
>     ''
>[f.when("arg == 'blabla'")]
>def f1(arg):
>     print 1
>[f.when("arg != 'blabla'")]
>def f2(arg):
>     print 2
>f('blabla')
>f('lala')
>
>it works just well, but I wonder is there a way to register f2() as
>default/fallback func ?

For now, use this:

     from dispatch.strategy import Signature
     default = Signature()  # empty test

     [f.when(default)]
     # etc.

It's a bit awkward, so I'm considering having some better way to express 
this.  You could use 'f.when("True")', except that it would then be 
considered ambiguous when any other guard expression is true, because the 
system doesn't "know" that a constant truth value is implied by any true 
expression, and that therefore the other expression has precedence.