3 ms·

Almost... You have a typed pointer to a function but that's not a void pointer and the "New C Standard" 6.3.2.3 states that you can't cast a function pointer t

• ygra 13y ago
  Not for function pointers; for passing data to callbacks that can be any type.
  • harrytuttle 13y ago
    Can you provide an example? Not 100% sure in which context you are talking about.
    • ygra 13y ago
      As an example, SQLite: int sqlite3_exec( sqlite3*, /* An open database */ const char *sql, /* SQL to be evaluated */ int (*callback)(void*,int,char**,char**), /* Callback function */ void *, /* 1st argument to callback */ char **errmsg /* Error msg written here */ ); Here the void * is an argument that is passed in the callback as well so that you can update your own struct with the result, for example. Singe the library cannot know anything about your types, void * is the only option.
      • harrytuttle 13y ago
        Thanks for the example. Agree entirely then :)