| array of objects? [message #29289] |
Mon, 11 February 2002 23:27 |
thomas.bielser
Messages: 2
Registered: February 2002
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Junior Member |
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I decided to change IDL-routines into oo. Simplified therefore I had
to create an own class:
; creating an own class
pro own_class__define
struct = { own_class, $
integer_value : 0L $
}
end
...containing two methods for setting and reading the integer_value of
an instance of this class:
; setproperty-method of the 'own class'
pro own_class::setproperty, integer_value=integer_value
if ( n_elements( integer_value ) ne 0 ) then
self.integer_value = integer_value
end
; getproperty-method of the 'own class'
function own_class::getproperty, integer_value=integer_value
if keyword_set( integer_value ) then begin
return, self.integer_value
endif
end
... now I create an array of 100 elements of this class with the
replicate-command:
; array for holding 100 elements of the type 'own_class'
a = replicate( OBJ_NEW( 'own_class'), 100)
... I label the integer_value-property of every element of this array
with its index (instead of a name, or whatever):
; label each array-element with it's number
for i=0, 99 do begin
; call the method setproperty
a[ i ] -> setproperty, integer_value = i
endfor
... here now something strange happens: From IDL I would expect from
the following commands, the following output:
IDL> print, a[0] -> getproperty( /integer_value )
0
IDL> print, a[50] -> getproperty( /integer_value )
50
IDL> print, a[99] -> getproperty( /integer_value )
99
...but IDL comes up with:
IDL> print, a[0] -> getproperty( /integer_value )
99
IDL> print, a[50] -> getproperty( /integer_value )
99
IDL> print, a[99] -> getproperty( /integer_value )
99
Is this a feature or a bug? Many thanks in advance!
Thomas
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