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What’s going on in this function prototype? Obviously the void parameter with some sort of typecasting is confusing…
int *my_func(my_struct *m, void (*m_op)(my_struct *v, void arg));
The second argument to the function
my_funcis a pointer to a function that returns no value (void), but which takes two arguments, amy_structpointer and … and (an invalid)void. The latter should probably bevoid *arg; you cannot have a variable or argument of typevoid. As it stands, the code should not compile.