GDAU100@BGUVM.BITNET ("Jonathan B. Owen") (11/17/88)
I use generic packages quite extensivly. This does not mean I understand
what code is generated out of the sources I write. This can be a problem
when trying to consider code efficiency...
What is performed in run-time each time the following is invoked:
procedure GENERIC_QUESTION( name : string ) is
subtype this_string_type is String(name'RANGE);
package THIS_CRUNCH is new STRING_CRUNCH( this_string_type );
begin
THIS_CRUNCH.STEP_ON_STRING( name );
end GENERIC_QUESTION;
When is the code produced? My immediate guess, is that the package
THIS_CRUNCH is creates ONCE for type "string" and not each time the
procedure is invoked with a different string. Am I right?
I came up with the above code while writing it, so don't try to make
sense out of it. Also, I have not thought out if the above is
necessary for creating a generic package for each subtype of type
"string". What I do know, is that I have encountered the need to
declare a subtype as a function of an unconstrained formal parameter.
And then, with this subtype, declare an instantiation of a generic
package.
Thanks for any clarification,
JB
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