From: David Alan Black <dblack@...>
Date: 2002-04-03T08:11:12+09:00
Subject: Re: seeking to understand...

Hello --

On Wed, 3 Apr 2002, Phil Tomson wrote:

> class MyDesign < RHDL::Design
>
>   def initialize()
>     a = Signal.new(1) #signals have a current value and history
>     b = Signal.new(1)
>
>     define_behavior {
>       c.assign {a or b}
>     }
>   end
> end
>
> The line: c.assign {a + b}
> makes use of a closure (the '{a + b}' is a Proc object which is what Ruby
> calls closures).  [As a side note: Signal defines an 'assign' method that
> takes either an immediate value or a proc.]  I don't want to assign the
> immediate value of (a or b) to c, I want to assign the function {a or b}
> so that it can be calculated later with varying values for Signals a and
> b.  Using a Proc (which, remember, is a closure) allows me to do that.
> The function {a or b} (NOTE: '{..}' are used to construct Procs) can then
> be evaluated later each time the values of a and b have been changed.

OK... but, in this example, how would you call the proc with different
values for a and b?


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav