1 pub trait EdgeTrait<N> {
7 type Edge: EdgeTrait<Self::Node>;
8 type NodesIter: Iterator<Item = Self::Node> + 'a;
9 type EdgesIter: Iterator<Item = Self::Edge> + 'a;
11 fn nodes(&'a self) -> Self::NodesIter;
12 fn out_edges(&'a self, u: &Self::Node) -> Self::EdgesIter;
13 fn in_edges(&'a self, u: &Self::Node) -> Self::EdgesIter;
15 fn out_neighbors(&'a self, u: &Self::Node) -> Box<Iterator<Item = Self::Node>> {
16 Box::new(self.out_edges(u).map(|e| e.target()))
17 //~^ ERROR cannot infer
20 fn in_neighbors(&'a self, u: &Self::Node) -> Box<Iterator<Item = Self::Node>> {
21 Box::new(self.in_edges(u).map(|e| e.target()))
22 //~^ ERROR cannot infer