Adding properties to a method?

[jonT]

Hi,

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

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

methodbar).foo #= 1

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

because methodbar) returns a new object each time.

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

Thanks,
Jon

 

[James Britt]

Hi,

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

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

methodbar).foo #= 1

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

because methodbar) 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)

 

[Trans]

You can check out Facets' kernel/method.

T.

 

[jonT]

Of coures what i'd actually get is:

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

methodbar)
# => <Method: Object#bar>
methodbar).class
# => Method

methodbar) 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
methodcd).args_classes={0=>JDir}

not terribly Ruby like but you get the picture.

Jon

 

[jonT]

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

 

[Eric Hodel]

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

methodbar).foo #= 1

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

because methodbar) returns a new object each time.

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