From: Joe Van Dyk <joevandyk@...>
Date: 2006-09-12T08:21:33+09:00
Subject: Re: passing function into another function

On 9/11/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Tue, 12 Sep 2006, Joe Van Dyk wrote:
>
> > Hi,
> >
> > I couldn't work out the syntax for the following:
> >
> > class Reports
> > def self.This; end
> > def self.That; end
> > end
> >
> > def do_something_with_a_report report
> >  # calls Reports::This or Reports::That, dtermined by what report is
> >  # something like report.call ?
> > end
> >
> > I want to do something like:
> >
> > do_something_with_a_report Reports::This
> >
> > But that calls Reports::This and sends that value to the
> > do_something_with_a_report function.
> >
> > In other words, I want to do something like passing a function pointer
> > to a function in C.
> >
>
> harp:~ > cat a.rb
> class Reports
>    def self.This; p 'This'; end
>    def self.That; p 'That'; end
>    This = method 'This'
>    That = method 'That'
> end
>
> def do_something_with_a_report report
>    report.call
> end
>
> do_something_with_a_report Reports::This
> do_something_with_a_report Reports::That
>
>
> harp:~ > ruby a.rb
> "This"
> "That"
>
> you could also just
>
> do_something_with_a_report Reports::method('This')
> do_something_with_a_report Reports::method('That')

Ah, Object#method.  Thank you both!

Joe