From: Daniel Nugent <nugend@...>
Date: 2006-02-23T10:14:11+09:00
Subject: Re: [ANN] lazy.rb 0.9.5 -- transparent futures!

table_name = "CUSTOMERS"
x = promise {table_name.dup}
table_name = "MONKEYS"
puts x
=>"CUSTOMERS"

Would avoid the problem.  Though it's good to point out that you
likely want to avoid changing the state of any variable that's
captured by a promise closure (unless of course you plan on exploiting
just that).

On 2/22/06, Daniel Sheppard <daniels@pronto.com.au> wrote:
> You can just do
>
> table_name = "CUSTOMERS"
> x = promise { table_name }
> puts x
> => "CUSTOMERS"
>
> though you have to then make sure that you leave that table_name
> variable alone.
>
> table_name = "CUSTOMERS"
> x = promise { table_name }
> table_name = "MONKEYS"
> puts x
> => "MONKEYS"
>
>
> ________________________________
>
>         From: Shashank Date [mailto:shanko_date@yahoo.com]
>         Sent: Thursday, 23 February 2006 9:15 AM
>         To: ruby-talk ML
>         Cc: mental@rydia.net
>         Subject: Re: [ANN] lazy.rb 0.9.5 -- transparent futures!
>
>
>         Hi,
>
>         I have a feature request (along with a quick-hack solution).
>
>         Please ignore if this is already done or sounds crazy. :-)
>
>         Problem: All the promises I make, cannot have any arguments ! !
>
>         So something like this is what I have in mind:
>
>         x = promise("CUSTOMERS") { |table_name|
> long_running_query(table_name)}
>
>         Admitedly, in this one-liner it does not make much sense. But if
> the block had many many lines of code and referred to the block variable
> at multiple places, suddenly it would be mean more to me.
>
>         I have attached my hackish solution without really thinking all
> the way thru.
>         Thanks,
>
>         -- Shashank
>
>
>         MenTaLguY <mental@rydia.net> wrote:
>         I'd like to announce a new version of lazy.rb -- this one
> offering
>         thread safety and transparent futures!
>
>         Here's the web site, complete with gem and tarball downloads,
> plus a bit
>         of documentation:
>
>         http://moonbase.rydia.net/software/lazy.rb/
>
>         Bug reports would be very, very welcome.
>
>
>
>
> ________________________________
>
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>
>
>


--
-Dan Nugent