Subject: SDL-News: casting to parent type ?
From: Thomas Garsiot (garsiot#st2e.com)
Date: Fri Dec 08 2000 - 08:46:26 GMT
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-----From Thomas Garsiot <garsiot#st2e.com> to sdlnews -----
Is there any way of casting a variable to its parent type ?
This is what I'm trying to do :
there is a built-in Octet_String type with a substring axiom (coming
from ASN-1 String0 generator).
This is a type we created :
newtype Frame inherits Octet_String operators all;
adding operators ...
I want to extract data from a frame using :
Data := substring(sdu,24,48) where Data is an Octet_String and sdu a
Frame (for example)
if sdu is of type Frame, I get (using Telelogic Tau SDL-Suite):
Type mismatch for variable, formal_parameter, literal or synonym.
Data := substring(?sdu,24,48)
if I try to cast sdu to Octet_String (Data:=<<Type Octet_String>>
substring(sdu,24,48)) I get the same error message.
What I'd like to do is something like
Does anybody know the SDL equivalent for this ?
Thanks in advance.
--End text from Thomas Garsiot <garsiot#st2e.com> to sdlnews ---
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