Added multimap

examples/multimap/README.md

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+# Multimap examples
+
+* multimap.c - Basic examples of a multimap.

examples/multimap/multimap.c

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+#include "multimap.h"
+#include "foreach.h"
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+
+int intcmp(int a, int b)
+{
+    return (a > b) - (a < b);
+}
+
+size_t inthash(int t)
+{
+    size_t a = t;
+    a += ~(a << 15);
+    a ^= (a >> 10);
+    a += (a << 3);
+    a ^= (a >> 6);
+    a += ~(a << 11);
+    a ^= (a >> 16);
+    return a;
+}
+
+MULTIMAP_GENERATE(mm, multi_map, , int, int)
+
+int main(int argc, char const *argv[])
+{
+    const int min = 1, max = 201;
+    multi_map *map = mm_new(50, 0.8, intcmp, inthash);
+
+    printf("Multimap actual capacity: %" PRIu64 "\n", map->capacity);
+    printf("Adding items from %d to %d twice\n", min, max);
+
+    for (int i = min; i < max; i++)
+        if (!mm_insert(map, i, i))
+            printf("ERROR with %d:%d\n", i, i);
+
+    for (int i = min; i < max; i++)
+        if (!mm_insert(map, i, i))
+            printf("ERROR with %d:%d\n", i, i);
+
+    printf("Multimap count    : %" PRIu64 "\n", map->count);
+    printf("Multimap capacity : %" PRIu64 "\n", map->capacity);
+    printf("Multimap load     : %lf\n", (double)map->count / (double)map->capacity);
+
+    int64_t sum = 0;
+
+    for (int i = min; i < max; i++)
+        sum += mm_get(map, i);
+
+    printf("Sum (unique): %" PRId64 "\n", sum);
+
+    FOR_EACH_MAP(mm, multi_map, int, int, map, {
+        printf("[%3" PRIu64 "] = { %3d : %3d }\n", index, key, value);
+    })
+
+    printf("Removing all items\n");
+
+    for (int i = min; i < max; i++)
+        if (!mm_remove_all(map, i))
+            printf("ERROR with %d:%d\n", i, i);
+
+    sum = 0;
+
+    for (int i = min; i < max; i++)
+        sum += mm_get(map, i);
+
+    printf("Sum: %" PRId64 "\n", sum);
+
+    FOR_EACH_MAP(mm, multi_map, int, int, map, {
+        printf("[%2" PRIu64 "] = { %2d : %5d }\n", index, key, value);
+    })
+
+    mm_free(map);
+
+    return 0;
+}