Adding properties to a method?


#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:

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 B.

“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

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


#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

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.

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


Eric H. - removed_email_address@domain.invalid - http://segment7.net
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