Dynamic array and map in C (header).

array.h

#ifndef ARRAY_H
#define	ARRAY_H

#ifdef	__cplusplus
extern "C" {
#endif

#define ARRAY_EXPAND_SIZE 10

struct array {
    void **items;
    int size;
    int _num_allocated;
    int _num_elements;
};

struct array *array_new(void);
int array_set(struct array *arr, int index, void *item);
int array_append(struct array *arr, void *item);
void *array_pop(struct array *arr);
void *array_get(struct array *arr, int index);
void *array_remove(struct array *arr, int index);
void array_free(struct array *arr);

struct map {
    struct array *keys;
    struct array *values;
};

struct map *map_new(void);
void *map_get(struct map *m, void *key);
int map_set(struct map *m, void *key, void *value);
void *map_remove(struct map *m, void *key);
void map_free(struct map *m);

#ifdef	__cplusplus
}
#endif

#endif	/* ARRAY_H */