[Cs3] breadth-first traversal in genealogy example

[Mikhail Nesterenko]

CS3 students,

There is nothing mysterious about BFS and it can be implemented using
the Composite Design Pattern. BFS needs a global queue. 
It can be a static member in Person class. The BFS pseudocode for
 Woman::accept(PersonVisitor *visitor) could be this:


     visitor->visit(this);
     for(auto child : children_) {
        que.push(child);
     }
     auto next=que.front();
     que.pop();
     next->accept();

Thanks,
-- 
Mikhail