// Assumes 0 <= i < length.
void *del(int i);
+ // Sort the list accoring to the given comparison function.
+ // NB: this sorts an array of pointers, so the pointer args need to
+ // be double-dereferenced.
+ void sort(int (*cmp)(const void *ptr1, const void *ptr2));
+
//----- control
// Set allocation increment to <inc>. If inc > 0, that many