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It seems that there is *a bit* polymorphism in IDL. [message #40464]

Wed, 11 August 2004 04:00

tianyf
Messages: 6
Registered: June 2004

Junior Member

I don't know if someone had ever noticed that what will happen if the
procedure and the function have the same name. My conclusion is that
IDL can figure out which one I am calling - the procedure or the
function. This may be a bit useful in some cases. Let's take a look at
the following example.

;+
; Name:
; msgbox
;
; Purpose:
; Another form of DIALOG_MESSAGE.
;
; Type:
; Function/Procedure
;
; Description:
; This is a mixed routine which has the same name for function
; and procedure. When called, it can distinguish which one is
; called. However, IDL cannot handle functions with the same
; name but with differenct number or type of parameters.
;
;-
;This is the procedure.
pro msgbox, text, _extra=_extra_
if n_params() lt 1 then text='Hello, the world!'
dummy=dialog_message(text,_extra=_extra_)
end
;
;This is the function.
function msgbox, text, _extra=_extra_
if n_params() lt 1 then text='Hello, the world!'
dummy=dialog_message(text,_extra=_extra_)
return,dummy
end

Tian.

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[Message index]

		It seems that there is a bit polymorphism in IDL. By: tianyf on Wed, 11 August 2004 04:00
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 12:43
		Re: It seems that there is a bit polymorphism in IDL. By: JD Smith on Thu, 12 August 2004 11:03
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 10:45
		Re: It seems that there is a bit polymorphism in IDL. By: JD Smith on Thu, 12 August 2004 10:28
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 07:08
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Wed, 11 August 2004 20:05
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Wed, 11 August 2004 14:51
		Re: It seems that there is a bit polymorphism in IDL. By: Mark Hadfield on Wed, 11 August 2004 14:34

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		It seems that there is a bit polymorphism in IDL. By: tianyf on Wed, 11 August 2004 04:00
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 12:43
		Re: It seems that there is a bit polymorphism in IDL. By: JD Smith on Thu, 12 August 2004 11:03
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 10:45
		Re: It seems that there is a bit polymorphism in IDL. By: JD Smith on Thu, 12 August 2004 10:28
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Thu, 12 August 2004 07:08
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Wed, 11 August 2004 20:05
		Re: It seems that there is a bit polymorphism in IDL. By: David Fanning on Wed, 11 August 2004 14:51
		Re: It seems that there is a bit polymorphism in IDL. By: Mark Hadfield on Wed, 11 August 2004 14:34