Reputation: 6768
I have the following code:
/* callback taking a pointer to a "generic" msg as argument */
typedef void (*Callback_t)(void *msg);
/* initialize callback pointer */
Callback_t const Callback[] =
{
ProcessMsgAction0, /**< 0: MSGID_ACTION_0 */
ProcessMsgAction1, /**< 1: MSGID_ACTION_1 */
/* ... */
};
/* Call the callback according to msgid */
msg = GetMessage();
Callback[msg->id](msg);
/* implement callback for each message id */
void ProcessMsgAction0(action0_t *msg) { /* ... */ }
void ProcessMsgAction1(action1_t *msg) { /* ... */ }
I though void* was considered as generic pointer. So whatever address i give it wont produce a warning but on the case above action0_t*
is different of void*
so it produce the following warning: initialization from incompatible pointer type
If I want to suppress the warning, is my only solution to change ProcessMsgAction argument to void* ?
compile option used: -ansi -pedantic -Wall -Wextra
Upvotes: 2
Views: 1301
Reputation: 46607
I though void* was considered as generic pointer
This is true, but the notion does not extend to matching parameters in function types.
A simple typecast to Callback_t
works however, see this functional example on ideone.
Upvotes: 2