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  1.  Home
  2. RPG400-L
  3. August 2003

Re: Value vs. Const

Peter Dow wrote:
Hi Hans,

That's what I suspected.  Also, afaik, there is no such thing as a read-only
pointer, correct?  So how sophisticated is the compiler's checking for
someone modifying a CONST parm?  Obviously a direct reference to the parm
would be easy to detect.  Would it also catch a reference to
%addr(MyConstParm) as well? Or some attempt to copy the pointer that is
actually passed and use it with a based variable to modify the parm?

The compiler does not allow any assignments to the CONST parameter within the procedure. Also, if you compute the address of a CONST parameter, you cannot assign that address to a variable. There are certainly ways to modify the value of a CONST parameter, but they usually involve lying to the compiler in some way.

Cheers! Hans



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