layout.dot

digraph {
    rankdir=LR;
    overlap=false;
    node [shape="plaintext"];

    hashmap[label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" VALIGN="TOP">
        <TR><TD COLSPAN="2" SIDES="B">HashMap</TD></TR>
        <TR><TD>buckets</TD><TD PORT="to_buckets"></TD></TR>
        <TR><TD>len</TD><TD>4</TD></TR>
    </TABLE>>];
    buckets[label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
        <TR><TD COLSPAN="2" SIDES="B">Vec&lt;Bucket&gt;</TD></TR>
        <TR><TD PORT="from_hashmap">index</TD><TD>ptr</TD></TR>
        <TR><TD>0</TD><TD PORT="to_vec0"></TD></TR>
        <TR><TD>1</TD><TD PORT="to_vec1"></TD></TR>
        <TR><TD>2</TD><TD PORT="to_vec2"></TD></TR>
        <TR><TD>3</TD><TD></TD></TR>
    </TABLE>>];

    vec0[label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
        <TR><TD COLSPAN="2" SIDES="B">Bucket&lt;K, V&gt;</TD></TR>
        <TR><TD PORT="from_buckets">index</TD><TD>pair</TD></TR>
        <TR><TD>0</TD><TD>John, blue</TD></TR>
        <TR><TD>1</TD><TD>Bob, green</TD></TR>
    </TABLE>>];
    vec1[label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
        <TR><TD COLSPAN="2" SIDES="B">Bucket&lt;K, V&gt;</TD></TR>
        <TR><TD PORT="from_buckets">index</TD><TD>pair</TD></TR>
        <TR><TD>0</TD><TD>Alice, red</TD></TR>
    </TABLE>>];

    vec2[label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
        <TR><TD COLSPAN="2" SIDES="B">Bucket&lt;K, V&gt;</TD></TR>
        <TR><TD PORT="from_buckets">index</TD><TD>pair</TD></TR>
        <TR><TD>0</TD><TD>Eve, black</TD></TR>
    </TABLE>>];

    edge[tailclip="false"];
    hashmap:to_buckets:c -> buckets:from_hashmap;
    buckets:to_vec0:c -> vec0:from_buckets;
    buckets:to_vec1:c -> vec1:from_buckets;
    buckets:to_vec2:c -> vec2:from_buckets;
}