Adding properties to a method?

ruby-talk
1

Hi,

I'd like to be able to do the following:

class Method; attr_accessor :foo; end
def bar; "some_res"; end
method(:bar).foo=1

method(:bar).foo #= 1

Of coures what i'd actually get is:
method(:bar).foo #= nil

because method(:bar) returns a new object each time.

Is it possible to bind properties to a method definition? If so, how?

Thanks,
Jon

2

jonT wrote:

Hi,

I'd like to be able to do the following:

class Method; attr_accessor :foo; end
def bar; "some_res"; end
method(:bar).foo=1

method(:bar).foo #= 1

Of coures what i'd actually get is:
method(:bar).foo #= nil

because method(:bar) returns a new object each time.

A String, in your example. Do you want the string to respond to the message 'foo=' ?

Is it possible to bind properties to a method definition? If so, how?

What do you mean by "bind" and "properties"?

···

--
James Britt

"Programs must be written for people to read, and only incidentally
  for machines to execute."
   - H. Abelson and G. Sussman
   (in "The Structure and Interpretation of Computer Programs)

3

You can check out Facets' kernel/method.

T.

4

Of course! It may not be the same method. Another thread may overwrite bar with a new implementation.

···

On Feb 5, 2006, at 10:08 AM, jonT wrote:

class Method; attr_accessor :foo; end
def bar; "some_res"; end
method(:bar).foo=1

method(:bar).foo #= 1

Of coures what i'd actually get is:
method(:bar).foo #= nil

because method(:bar) returns a new object each time.

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

5

Of coures what i'd actually get is:
method(:bar).foo #= nil
because method(:bar) returns a new object each time.

A String, in your example. Do you want the string to respond to the
message 'foo=' ?

method(:bar)
# => <Method: Object#bar>
method(:bar).class
# => Method

method(:bar) actually returns a method object.

What do you mean by "bind" and "properties"?

Sorry. By bind I meant simply to set the value of a properety in the
usual way. By property I mean property: a public field.

Essentially what I'm aiming to do is to have some way of storing data
about a method (which is either private to Object or a member of some
class or module) such that it is publicly available. Example:

def cd(dir)
  FileUtils.cd(dir.path)
  nil
end
method(:cd).args_classes={0=>JDir}

not terribly Ruby like but you get the picture.

Jon

6

Thanks, method! from
<http://facets.rubyforge.org/rdoc-nano/classes/Object.html#M000260>
works great.