| Re: syntax for calling parent class _overloadPlus method [message #93161 is a reply to message #93120] |
Tue, 03 May 2016 10:05  |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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On 4/29/16 3:45 AM, Markus Schmassmann wrote:
> when searching for the definition of the variable class i found a file
> idl_variable__define.pro in the following path:
> /opt/idl/idl_local/pub_domain/ssw/gen/idl/clients/rpc/
> (i don't maintain that file tree)
> it does have an ::init & ::setvalue function.
I actually have an IDL_Object class in my library as well. It is useful
if I want the object to have overloaded operators when running in IDL
8.0+, but still compile and is usable (without the operators) when
running on less than IDL 8.0.
> As for the _overloadPlus, i may apparently erred in assuming
> http://www.harrisgeospatial.com/docs/Overloadable_Operators. html applies
> also to variables, i assumed them not beeing mentioned in the __define
> file meant they were implemented in C but still could be accessed as i
> wanted.
From the docs for IDL_Object:
> This class serves as an interface class for other classes. There is
never a need to instantiate an IDL_Object class directly.
What I understand this to mean, is that there is no implementation at
all of IDL_Object, it is just a definition which marks an object as
possibly having operator overloaded methods. I thought there was
something more in the docs about this, but I couldn't find it.
> Then let me rephrase the question:
>
> What class(es) should i use as parent class, if i want to create a
> class, that during initialisation or initial set_value accepts an array
> and a repetition pattern, and afterwards should behave as if the
> sandboxMember has been expanded from the array & pattern using a
> combination of rebin,reform,transpose...
> sandbox(indgen(1,10),[40, 1,60]) should behave the same as
> rebin(indgen(1,10),[40,10,60]), but only use the memory of indgen(10)
> and an array ulong[8] and run faster. The operators themselves when not
> operating on trivial cases will have to be implemented in C.
>
> i want to be able to pass my sandboxMembers to foreign code that should
> not realize it has not been passed an ordinary array. It will not be a
> small thing to do, but if done right should increase idl performance
> quite a bit.
>
> PS: sorry for the double-post before
You will have to inherit from IDL_Object to get operator overloading,
but you will have to implement all code yourself, you will get nothing
from IDL_Object.
Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
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