| Re: syntax for calling parent class _overloadPlus method [message #93120 is a reply to message #93113] |
Fri, 29 April 2016 02:45   |
Markus Schmassmann
Messages: 129
Registered: April 2016
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Senior Member |
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On 04/28/2016 10:35 PM, Michael Galloy wrote:
> On 4/28/16 7:01 AM, Markus Schmassmann wrote:
>> i'm trying to overload operators for my subclass of idl_variable, but
>> don't find the correct syntax for calling the parent classes' operator
>> function.
>>
>> How do i have to correct the line below marked ';problem' without using
>> 'left+right'?
>> i guess i have to put something like XXX.idl_variable::_overload...
>> but what would then be XXX?
>>
>> ---
>> pro sandbox__define
>> struct={sandbox, $
>> inherits idl_variable, $
>> reps: ptr_new() $
>> }
>> end
>>
>> function sandbox::Init, array, reps
>> ; a bit of code
>> void=self.idl_variable::init()
>> void=self.idl_variable::set_value(array)
>> *self.reps=reps
>> return, 1
>> end
>>
>> function sandbox::_overloadPlus, left, right
>> ; some code
>> out=idl_variable::_overloadPlus(left,right) ;problem
>> ; some more code
>> return, out
>> end
>> ---
>>
>> PS: Sorry, stupid question of a beginner, but i failed to find the
>> solution elsewhere.
>> PPS: There may be more errors, but the rest at least compiles.
>
> In general, you would use something like the following to call a
> parent's implementation:
>
> out = self->IDL_Variable::overloadPlus(left, right)
>
> You can use the . notation you used in ::init as well:
>
> out = self.IDL_Variable::overloadPlus(left, right)
>
> But, in your case, you are calling some methods that don't exist. As
> far as I can tell, there are no IDL_Variable::init,
> IDL_Variable::set_value, and IDL_Variable::_overloadPlus methods.
>
> Mike
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.
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.
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
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