comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: LIST extensions

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: LIST extensions [message #74055 is a reply to message #73962]

Wed, 15 December 2010 06:54

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Matt Haffner wrote:
> Also, note that LIST is a subclass of IDL_Container, which has
> a .Count() method, so .Length() may not be needed.

Excellent tip. I did not know that LIST was a subclass of IDL_Container. I will be sure to check that sort of thing with
other IDL objects in the future, i.e.
IDL> l=list(1,2,34,4)
IDL> help, l, /object
** Object class LIST, 2 direct superclasses, 4 known methods
Superclasses:
IDL_CONTAINER <Direct>
IDL_OBJECT <Direct>
Known Function Methods:
IDL_CONTAINER::COUNT
LIST::INIT
LIST::_OVERLOADHELP
Known Procedure Methods:
LIST::ADD
IDL> help, l.count()
<Expression> LONG = 4

And the Get method worked even though the list contains no objects:

IDL> help, l.get(position=2)
<PtrHeapVar4> LONG = 34

As does the Move:
IDL> print, l
1
2
34
4
IDL> l.move,2,0
IDL> print, l
34
1
2
4

Tres cool!

I don't know why I should be surprised. But it would be nice if the superclasses were listed in the documentation.

Again, thanks for the info.

cheers,

paulv

> There is also
> a .Move method to rearrange items in a container. Unfortunately
> the .IsContained method doesn't seem to work for me on a LIST though
> (and is only for objects, in any case):
>
> IDL> z=g[50]
> IDL> print,g.IsContained(z)
> 0
> IDL> print,obj_valid(z, /get_heap)
> 1884104
> IDL> print,obj_valid(g[50], /get_heap)
> 1884104
> IDL> print, z eq g[50]
> 1
>
> mh

Report message to a moderator

[Message index]

		Re: LIST extensions By: Matt Haffner on Tue, 14 December 2010 22:51
		Re: LIST extensions By: penteado on Tue, 14 December 2010 14:31
		Re: LIST extensions By: penteado on Wed, 22 December 2010 15:47
		Re: LIST extensions By: penteado on Sat, 01 January 2011 22:37
		Re: LIST extensions By: Paul Van Delst[1] on Wed, 15 December 2010 06:54

Previous Topic:	Re: screen capture of xplot3d
Next Topic:	LIST extensions

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 01:27:15 PDT 2025

Total time taken to generate the page: 0.72054 seconds