Navigation C API Pages Python bindings Applications

Hash table

Hash table implements fast mapping between strings and pointers.

Hash table constructor and destructor
enum gp_htable_flags {
        GP_HTABLE_COPY_KEY = 0x01,
        GP_HTABLE_FREE_KEY = 0x02,

gp_htable *gp_htable_new(unsigned int order, int flags);

void gp_htable_free(gp_htable *self);

Allocates and frees a hash table.

The order can be used to pass a hint on number of expected records that are going to be put into the table, which can save rehasing operations. Order 0 table is expected to hold aprox. 5 entries and the size aproximetly doubles with each order increase.

The GP_HTABLE_COPY_KEY can be used request to strdup() the string key on gp_htable_put(), if not set the table just stores pointer to the key instead.

Similarily the GP_HTABLE_FREE_KEY can be passed to free() the key when table is being freed.

Hash table put
void gp_htable_put(gp_htable *self, void *val, char *key);

Puts an record to the hash table.

void *gp_htable_get(void *self, const char *key);

Returns a record from a table or NULL if not found.