improve examples

examples/hashmap/hm1.c

@@ -1,7 +1,80 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../../hashmap/myhashmap.h"
+
+#define MAX_STR_LEN 64
+
+/* My custom data type stored as value */
+struct my_custom_type_t {
+	int age;
+	char favourite_brand[MAX_STR_LEN];
+};
+
+/* Let's hash our name */
+static unsigned int my_hash_func(const void *key) {
+	char *name = (char *)key;
+	size_t len = strlen(name);
+
+	unsigned int hash = 0;
+	for (size_t i = 0; i < len; ++i) {
+		hash += (int)name[i];
+	}
+
+	return hash % 2069;
+}
+
+/* Let's write our compare function */
+bool my_equal_fun(const void *key_a, const void *key_b) {
+	char *name_a = (char *)key_a;
+	char *name_b = (char *)key_b;
+
+	if (strcmp(name_a, name_b) == 0) {
+		return true;
+	}
+
+	return false;
+}
+
+/* And our last two functions, the free key and value called inside mcl_hm_remove() */
+void my_free_key(void *key) { free(key); }
+
+void my_free_value(void *value) {
+	struct my_custom_type_t *mct = (struct my_custom_type_t *)value;
+	free(mct);
+}
 
 int main(void) {
-    puts("TODO: Hashmap");
+	/* Allocate a new hashmap */
+	/* Pass your custom hash, equal and free functions */
+	/* This hashmap will contain names as keys and a custom type as value */
+	size_t key_size = sizeof(char) * MAX_STR_LEN;
+	size_t value_size = sizeof(int) + sizeof(char) * MAX_STR_LEN;
+	mcl_hashmap *map = mcl_hm_init(my_hash_func, my_equal_fun, my_free_key, my_free_value, key_size, value_size);
 
-    return 0;
+	/* Set a new value */
+	struct my_custom_type_t p1 = {
+		.age = 21,
+	};
+	strncpy(p1.favourite_brand, "Ferrari", sizeof(p1.favourite_brand));
+
+	mcl_hm_set(map, "John", &p1);
+
+	/* Retrieve the data */
+	mcl_bucket *john = mcl_hm_get(map, "John");
+	char *name = (char *)john->key;
+	struct my_custom_type_t *john_v = (struct my_custom_type_t *)john->value;
+	int age = john_v->age;
+	char *fav_brand = john_v->favourite_brand;
+	fprintf(stdout, "Name: %s\nAge: %d\nFavourite brand: %s\n", name, age, fav_brand);
+	mcl_hm_free_bucket(john);
+
+	/* Remove a key from hash map */
+	mcl_hm_remove(map, "John");
+
+	/* Deallocate */
+	mcl_hm_free(map);
+
+	return 0;
 }