#include "toolbox.h" struct array *sort(struct array *arr, comparator f) { (void)arr; (void)f; return NULL; } struct array *map(struct array *arr, size_t output_size, mapper f) { (void)arr; (void)f; (void)output_size; return NULL; } struct array *filter(struct array *arr, predicate f) { (void)arr; (void)f; return NULL; } void *reduce(struct array *arr, void *start_value, reducer f) { (void)arr; (void)f; (void)start_value; return NULL; } void foreach(struct array *arr, acceptor f) { (void)arr; (void)f; }