Return an edge with sum of both weights. If given payload will be kept from existingEdge .
auto g1 = Graph!(int, int)([1, 2]); alias CS = g1.ConflictStrategy; g1 ~= g1.edge(1, 2, 1); auto addedEdge = g1.add!(CS.sumWeights)(g1.edge(1, 2, 1)); assert(addedEdge.weight == 2);
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Return an edge with sum of both weights. If given payload will be kept from existingEdge .