ConflictStrategy.keep

1 auto g1 = Graph!(int, int)([1, 2]);
2 alias CS = g1.ConflictStrategy;
3 
4 g1 ~= g1.edge(1, 2, 1);
5 
6 auto addedEdge = g1.add!(CS.keep)(g1.edge(1, 2, 2));
7 
8 assert(addedEdge.weight == 1);