From: Eric Mahurin <eric_mahurin@...>
Date: 2005-05-27T02:34:21+09:00
Subject: will callable objects be more general in Ruby 1.9?

In Ruby 1.9 CVS, you can "call" local variables. i.e.

f = {|*args,&block| puts(*args);block[]}

f("hello","world!") {puts("bye")}

The last statement is equivalent to:

f.call("hello","world!") {puts("bye")}


I see multiple applications of these callable objects outside
of just calling a Proc (how about call=new in Class, call=each
in Enumerable, or call=clone in Object).  Unfortunately what's
in 1.9 lacks some generality.  These don't work:

1. Allowing "f" to be an expression rather than just a local
variable:
{|*args,&block| puts(*args);block[]} ("hello","world!")
{puts("bye")}

2. Allowing the () to be optional if a block is specified:
f {puts("bye")}


Any plans making these callable objects more general?

Another option for getting syntax like #1 above would be to
allow the [] operator to take a block ("f" can already be an
expression):

f["hello","world!"] {puts("bye")}


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