From: Guillaume Cottenceau <gc@...>
Date: 2001-03-06T23:08:56+09:00
Subject: [ruby-talk:12134] Re: Proc.arity() broken on Windows?

Mike Bowler <mbowler@GargoyleSoftware.com> writes:

> When I run the following code on windows and on linux, I get different
> results.
> 
> def testArity( &proc )
>     puts proc.arity()
> end
> 
> testArity() {}
> testArity() { |a| }
> testArity() { |a,b| }
> testArity() { |a,b,c| }
> 
> On linux, the result is:
> -1
> -2
> 2
> 3
> 
> On windows, the result is:
> -1
> -1
> 2
> 3
> 
> This means that on windows there seems to be no way to distinguish
> between no parameters and one parameter.

Actually, a block with exactly no parameter, and exactly one paramter,
will look like that:

testArity() { || }
testArity() { |a,| }


About the behaviour, I think the Windows behaviour is the old Ruby
behaviour (reported in the Ruby Pragmatic Programmers book if I remind it
well) and the Linux behaviour is the recent one.



-- 
Guillaume Cottenceau - http://us.mandrakesoft.com/~gc/