Using RTTI to identify subclasses

Hello, here is my dilemma:
Class B inherits from Class A. Classes C and D inherit from Class B.
I need to test if object O is an instance of Class A or any of its subclasses (ie Class A, B, C or D). Using the method GET_RELATIVE_NAME is not suitable because then I must know the actual name of the subclass, which I will not. The methods APPLIES_TO and APPLIES_TO_CLASS do not seem to account for inheritance (ie Class D APPLIES_TO Class A is false, even though Class A is a superclass of Class D).
Any feedback would be very nice. I'd like to accomplish this, if possible, using RTTI since it is more elegant than simply casting the object into a reference of type Class A and seeing if an error is thrown.
I'm on 4.7, WebAS 6.30.
Cheers,
Mike

I know this is NOT a RTTI way of doing this task and I can tell you from looking for hours at RTTI that it does not look at the information in this "bottom-up" manner. Although, this would be totally unsupported you can recursivley read the VSEOEXTEND table. That table keeps the relations of all classes and sub-classes. Sadly, CL_ABAP_CLASSDESCR is marked as final so you can't even subclass it to add this functionality.
hope this helps.
-d

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Hi There,
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VG
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Edited by: Thomas Zloch on Nov 5, 2010 9:42 AM - please use code tags

Hi,
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gi_data type ref to data.
FIELD-SYMBOLS: <gi_data> TYPE STANDARD TABLE.
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TRY.
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EXPORTING
p_line_type = go_struct
p_table_kind = 'S'
RECEIVING
p_result = go_table.
CATCH cx_sy_table_creation .
*MESSAGE e000 WITH text-004.
ENDTRY.
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SELECT * INTO TABLE <gi_data> FROM ( GS_TAB_LIST-tabname ).
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separator_not_allowed = 8
filesize_not_allowed = 9
header_too_long = 10
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dp_error_send = 12
dp_error_write = 13
unknown_dp_error = 14
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dp_out_of_memory = 16
disk_full = 17
dp_timeout = 18
file_not_found = 19
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Little tip to get the nr of elements in a local structure using RTTI

sometimes you need to know the number of elements in a structure for manpulating data
for example you might need to convert the elements in an internal table to a special file format such as "field","field",......"field".
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DATA lr_rtti_struc TYPE REF TO cl_abap_structdescr .
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hi Jimbo,
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