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deconstruct the `ControlFlowGraph` trait into more granular traits
[rust.git] / src / librustc_data_structures / control_flow_graph / reference.rs
1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 use super::*;
12
13 impl<'graph, G: DirectedGraph> DirectedGraph for &'graph G {
14     type Node = G::Node;
15 }
16
17 impl<'graph, G: WithNumNodes> WithNumNodes for &'graph G {
18     fn num_nodes(&self) -> usize {
19         (**self).num_nodes()
20     }
21 }
22
23 impl<'graph, G: WithStartNode> WithStartNode for &'graph G {
24     fn start_node(&self) -> Self::Node {
25         (**self).start_node()
26     }
27 }
28
29 impl<'graph, G: WithSuccessors> WithSuccessors for &'graph G {
30     fn successors<'iter>(&'iter self, node: Self::Node) -> <Self as GraphSuccessors<'iter>>::Iter {
31         (**self).successors(node)
32     }
33 }
34
35 impl<'graph, G: WithPredecessors> WithPredecessors for &'graph G {
36     fn predecessors<'iter>(&'iter self,
37                            node: Self::Node)
38                            -> <Self as GraphPredecessors<'iter>>::Iter {
39         (**self).predecessors(node)
40     }
41 }
42
43 impl<'iter, 'graph, G: WithPredecessors> GraphPredecessors<'iter> for &'graph G {
44     type Item = G::Node;
45     type Iter = <G as GraphPredecessors<'iter>>::Iter;
46 }
47
48 impl<'iter, 'graph, G: WithSuccessors> GraphSuccessors<'iter> for &'graph G {
49     type Item = G::Node;
50     type Iter = <G as GraphSuccessors<'iter>>::Iter;
51 }