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use crate::fx::FxHashMap;
use std::cmp::max;
use std::iter;
use std::slice;
use super::*;
pub struct TestGraph {
num_nodes: usize,
start_node: usize,
successors: FxHashMap<usize, Vec<usize>>,
predecessors: FxHashMap<usize, Vec<usize>>,
}
impl TestGraph {
pub fn new(start_node: usize, edges: &[(usize, usize)]) -> Self {
let mut graph = TestGraph {
num_nodes: start_node + 1,
start_node,
successors: FxHashMap::default(),
predecessors: FxHashMap::default(),
};
for &(source, target) in edges {
graph.num_nodes = max(graph.num_nodes, source + 1);
graph.num_nodes = max(graph.num_nodes, target + 1);
graph.successors.entry(source).or_default().push(target);
graph.predecessors.entry(target).or_default().push(source);
}
for node in 0..graph.num_nodes {
graph.successors.entry(node).or_default();
graph.predecessors.entry(node).or_default();
}
graph
}
}
impl DirectedGraph for TestGraph {
type Node = usize;
}
impl WithStartNode for TestGraph {
fn start_node(&self) -> usize {
self.start_node
}
}
impl WithNumNodes for TestGraph {
fn num_nodes(&self) -> usize {
self.num_nodes
}
}
impl WithPredecessors for TestGraph {
fn predecessors(&self, node: usize) -> <Self as GraphPredecessors<'_>>::Iter {
self.predecessors[&node].iter().cloned()
}
}
impl WithSuccessors for TestGraph {
fn successors(&self, node: usize) -> <Self as GraphSuccessors<'_>>::Iter {
self.successors[&node].iter().cloned()
}
}
impl<'graph> GraphPredecessors<'graph> for TestGraph {
type Item = usize;
type Iter = iter::Cloned<slice::Iter<'graph, usize>>;
}
impl<'graph> GraphSuccessors<'graph> for TestGraph {
type Item = usize;
type Iter = iter::Cloned<slice::Iter<'graph, usize>>;
}
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