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comp.lang.ruby

Over Loading

Selvaraj Subbaian

3/27/2008 6:18:00 AM

Hai All,

Question looks like simple Why ruby is not supporting over loading??

I think we can pass any number of argument as an array to method. is
this the reason or any other ???
--
Posted via http://www.ruby-....
4 Answers

???? ?????????

3/27/2008 9:34:00 AM

0

Because of Ruby type system

You cant write

def test(int i)

end

def test(string s)

end

In Ruby this is
def test(arg)
end

So you can do something like this
def test(arg)
if arg.is_a?(String)
else
end
end

Robert Klemme

3/27/2008 12:09:00 PM

0

2008/3/27, Selvaraj Subbaian <selvaraj@srishtisoft.com>:
> Question looks like simple Why ruby is not supporting over loading??

You would have to ask Matz for details. Here are some potential reasons:

- Ruby is dynamically typed which makes overloading based on argument
types impossible; you could only overload on argument list structure
(mostly number of args)

- argument list structure based overloading is seldom useful and in
those cases the implementer can do it himself - no need to burden the
language with this.

- because of Ruby's dynamic nature methods that are overloaded based
on argument type in other languages often fall into one and need not
be overloaded.

> I think we can pass any number of argument as an array to method. is
> this the reason or any other ???

This might be part of the reason (see above).

Kind regards

robert

--
use.inject do |as, often| as.you_can - without end

Florian Gilcher

3/27/2008 12:31:00 PM

0

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Hash: SHA1


On Mar 27, 2008, at 10:34 AM, =D0=98=D0=B2=D0=B0=D0=BD =
=D0=95=D0=B2=D1=82=D1=83=D1=85=D0=BE=D0=B2=D0=B8=D1=87 wrote:
>
>
> So you can do something like this
> def test(arg)
> if arg.is_a?(String)
> else
> end
> end
>


There are some projects out there that allow pattern matching on =20
arguments to some extend. (search for "match" on rubyforge)

Basically, they work by defining a proxy method that does the pattern =20=

matching and then calling some predefined procs. Essentially,
they define this test-Method dynamically.
This is not overloading in a strict sense, but it comes close.

Greetings
Florian Gilcher
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Iñaki Baz Castillo

3/27/2008 1:30:00 PM

0

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