simple_generic_array_list.c

#include<stdio.h>
#include<stdlib.h>

typedef struct {
  void**  values;
  size_t  len, capacity;
} ArrList;

ArrList* init_list(size_t capacity) {
  ArrList *l = (ArrList*) calloc(1, sizeof(ArrList));
  l->capacity = capacity;
  l->len = 0;
  l->values = (void**) calloc(capacity, sizeof(void*));
  return l;
}

void add_value(ArrList *l, void *value) {
  if(l->len == l->capacity) {
    l->capacity += 100;
    l->values = (int*) realloc(l->values, l->capacity *sizeof(void*));
  }
  l->values[l->len++] = value;
}

void destroy_arrlist(ArrList *list, void (*destroy_value)(void* value)) {
  for(int i = 0; i < list->len; i++)
    destroy_value(*(list->values + i));
  free(list);
}