c - Clarifications about pointers use -

i have question exact meaning of pointers phrase.

i have following method:

myfunc(const void * p) {   ... } 

and being called by:

mystruct *st; ... myfunc((char **)&st->arr); 

i have experience pointers, in case still lost these pointers , casting.. can please accurate explanation how case works?

thanks

this seams bad quality code! maybe not dangerous, const appears in prototype.

myfunc(const void * p) accepts pointer , const should mean won't touch it.

now, st pointer mystruct, st->arr value of arr member , &st->arr memory address of arr member. assuming arr array, st->arr value pointer.

so, (char**) possibly correct type of &st->arr, pointer character array. , if correct type, there no need cast!

you cast when need tell compiler handle data data. make sense, in case myfunc((const void *)&st->arr);

anyway, without further information on myfunc, belive true programmer intention myfunc((const void *) st->arr);