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Re: Smart way to extract the same attribute from a list of objects? [message #81552]

Thu, 04 October 2012 09:53

PMan
Messages: 61
Registered: January 2011

Member

Well, I will share with you what I did. Not sure about if it qualitfies as better/faster/more-elegant, but here you go.

I created a new object that is just a list:

pro newObj__define
compile_opt idl2

_ = {newObj, $
inherits list $
}

Then, in my init, I created a struct like

function newObj::init, nSamples = nSamples
compile_opt idl2

newObjStruct = {newObjStruct, $
radiance:0, $
channel:0}

self->add, replicate(newObjStruct, nSamples), /extract

return, 1
end

Then I overloaded the setProperty and getProperty functions.

pro newObj::setProperty, _extra=extra
compile_opt idl2

if self->isEmpty() then return

if (~n_elements(extra)) then return

num = n_elements((tags=tag_names(extra)))

lArray = self->toArray()
self->remove, /all

for ii=0, num-1 do begin
ok = execute("lArray."+tags[ii]+ " = extra.(ii)")
endfor

self.add, lArray, /extract
end

pro newObj::getProperty, _ref_extra=extra
compile_opt idl2

if self->isEmpty() then return

if (~n_elements(extra)) then return

lArray = self.toArray()

for ii=0, n_elements(extra)-1 do begin
ok = execute("(scope_varfetch(extra[ii], /ref_extra)) = lArray."+extra[ii])
endfor

end

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		Re: Smart way to extract the same attribute from a list of objects? By: PMan on Thu, 04 October 2012 09:53
		Re: Smart way to extract the same attribute from a list of objects? By: Paul Van Delst[1] on Thu, 04 October 2012 11:11

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