From: daz <dooby@...10.karoo.co.uk>
Date: 2004-07-18T10:57:11+09:00
Subject: Re: [QUESTION] : about class method


Kurk Lord wrote:
> Hi all,
>
> can somebody tell me if a class method can call (or use) a instance method ?
> Example :
>
> class Foo
>     @@count = 0
>
>     def bar
>         @@count = @@count + 1
>     end
>
>     def Foo.suck
>         bar
>     end
> end
>

You could arrange the "bar" instance method so that it calls a class method
to do the class-specific operation, making it available from either level.


class Foo
    @@count = 0

    def Foo.suck
        bar
    end

    def Foo.bar
        @@count = @@count + 1
        # other (bar) class stuff
        p [:count, @@count]
    end

    def bar
        Foo.bar
        # other (bar) instance stuff
        p ['#bar', @@count]
    end
end

Foo.suck     #-> [:count, 1]
Foo.suck     #-> [:count, 2]
Foo.new.bar  #-> [:count, 3] #-> ["#bar", 3]


:daz