When to Overload the Comma Operator?

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I have used the comma operator in order to index maps with multiple indices.

enum Place {new_york, washington, ...};

pair<Place, Place> operator , (Place p1, Place p2)
{
    return make_pair(p1, p2);
}


map< pair<Place, Place>, double> distance;

distance[new_york, washington] = 100;

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