Purity with references and pointers

Jonathan M Davis jmdavisProg at gmx.com
Sat Sep 18 17:24:26 PDT 2010


If a pure function takes a reference/pointer, does that state that the result of 
the function will be the same on two calls to it if the reference/pointer points 
to the same data in both cases or if the data itself is unchanged?

If it's a matter of pointing to the same data, then that could be horribly 
broken. That would mean that as long as I pased in the same reference, the 
compiler could cache the result but that the actual result of the function could 
have and should have been different for each call because the object pointed to 
was altered.

- Jonathan M Davis


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