Nested Functions

Listing 7: Nested function version of Listing 6.

class Symbol
{   char[] id;
    Symbol left;
    Symbol right;
}
Symbol symbol_membersearch(Symbol[] table, char[] id)
{   Symbol sm;
    void membersearchx(Symbol s)
    {
    while (s)
    {
        if (id == s.id)
        {
        if (sm)
            error("ambiguous member %s\n", id);
        sm = s;
        }
        if (s.left)
        membersearchx(s.left);
        s = s.right;
    }
    }
    for (int i = 0; i < table.length; i++)
    {
    membersearchx(table[i]);
    }
    return sm;
}