TutPtrAryChangeCbLookup

Name

TutPtrAryChangeCbLookup — look up a pointer array change callback

Synopsis

T_CB TutPtrAryChangeCbLookup(ptr_ary, change_func, arg) 
T_PTR_ARY ptr_ary; 
T_PTR_ARY_CHANGE_CB_FUNC change_func; 
T_CB_ARG arg; 

Arguments

ptr_ary — pointer array to look up the change callback for

change_func — callback function

arg — callback function argument

Return Values

Returns callback if successful, NULL otherwise.

Diagnostics

If TutPtrAryChangeCbLookup fails, it returns NULL and sets the global SmartSockets error number to one of:

Description

TutPtrAryChangeCbLookup returns the callback registered with TutPtrAryChangeCbCreate, if any. The arguments ptr_ary, change_func, and arg must match precisely those used in TutPtrAryChangeCbCreate for the call to be successful.

Caution

None

See Also

TutPtrAryChangeCbCreate

Examples

This example looks up a change callback:

T_CB cb;  
 
cb = TutPtrAryChangeCbLookup(ptr_ary, PtrAryChanged, NULL); 
if (cb == NULL) { 
  /* error */ 
}