transformations.c

[John Darrington]

The following confuses me:

/* Executes the given CHAIN of transformations on C,
   passing *CASE_NR as the case number.
   If a transformation modifies *CASE_NR, it will affect the case
   number passed to following transformations.
   ... */
enum trns_result
trns_chain_execute (struct trns_chain *chain, enum trns_result start,
                    struct ccase *c, const size_t *case_nr)

How can *case_nr be modified if it's const ?  
Wouldn't it make more sense for this function to have the sig:

enum trns_result
trns_chain_execute (struct trns_chain *chain, enum trns_result start,
                    struct ccase *c, casenumber case_nr);

??

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