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use crate::{Graph, GraphError, Revision, NULL_REVISION};
#[derive(Clone, Debug)]
pub struct SampleGraph;
impl Graph for SampleGraph {
fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
match rev {
0 => Ok([NULL_REVISION, NULL_REVISION]),
1 => Ok([0, NULL_REVISION]),
2 => Ok([1, NULL_REVISION]),
3 => Ok([1, NULL_REVISION]),
4 => Ok([2, NULL_REVISION]),
5 => Ok([4, NULL_REVISION]),
6 => Ok([4, NULL_REVISION]),
7 => Ok([4, NULL_REVISION]),
8 => Ok([NULL_REVISION, NULL_REVISION]),
9 => Ok([6, 7]),
10 => Ok([5, NULL_REVISION]),
11 => Ok([3, 7]),
12 => Ok([9, NULL_REVISION]),
13 => Ok([8, NULL_REVISION]),
r => Err(GraphError::ParentOutOfRange(r)),
}
}
}
pub type VecGraph = Vec<[Revision; 2]>;
impl Graph for VecGraph {
fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
Ok(self[rev as usize])
}
}