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\begin{verbatim}
#include<iostream.h>
#include "ProgFlowInfo.h"
#include <LINK/graph/Edge.h>
#include <LINK/graph/Attribute.h>
int FlowInfo::flow(Edge *e) const
{
        int f;
        if (e->owner() != _g) {
            error("FlowInfo::flow(): illegal edge"); return 0;
        }
        if (getAttribute((GraphObject*)e,"flowvalue",f) == LINK_GET_ATTR_FAIL) {
            error("FlowInfo::flow(): no flowvalue attribute set"); return 0;
        }
        return f;
}
int FlowInfo::capacity(Edge *e) const
{
        int c;
        if (e->owner() != _g) {
            error("FlowInfo::flow(): illegal edge"); return 0;
        }
        if (getAttribute((GraphObject*)e,"capacity",c) == LINK_GET_ATTR_FAIL) {
            error("FlowInfo::flow(): no capacity attribute set"); return 0;
        }
        return c;
}
ostream& operator<<(ostream &, Container<Vertex *> const &);

ostream& operator<<(ostream& os, const FlowInfo& finfo)
{
        int i;
        os << "{" << finfo._g->vertices();
        Iterator<Edge*> get_edge(&finfo._g->edges());
        Edge *e;
        while (get_edge(e)) {
                os << "{" << *e;
                os << "(" << finfo.flow(e) << "," << finfo.capacity(e) << ")";
                os << "}";
        }
}
void FlowInfo::display() const
{
        cout << *this;
}
\end{verbatim}

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