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Subject: Re: Strings as Parameters
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From: Matthew Heaney <matthewjheaney@earthlink.net>
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Date: Tue, 05 Oct 2004 00:20:32 GMT
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Date: 2004-10-05T00:20:32+00:00
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"Rick Santa-Cruz" <rick_santa_cruz75@msn.com> writes:

> But if I use a String as a Parameter of a function or procedure I don't have 
> to specify the range. That means I can just write a procedure like this:
> 
> procedure Test_It(S: String) is
> begin
> ...
> end Test_It;
> 
> What is the technical detail behind this? And why is such possible?

Because some extra information, called a "dope vector", is passed in the
call.  The dope vector describes the index values of the array object
passed as the parameter.  That's how how the called operation knows the
index constraints (and the length) of the array object.