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use rustc_data_structures::graph::NodeIndex;
use rustc_data_structures::unify::UnifyKey;
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub struct DagId {
index: u32,
}
impl DagId {
pub fn from_input_index(n: NodeIndex) -> Self {
DagId { index: n.0 as u32 }
}
pub fn as_input_index(&self) -> NodeIndex {
NodeIndex(self.index as usize)
}
}
impl UnifyKey for DagId {
type Value = ();
fn index(&self) -> u32 {
self.index
}
fn from_index(u: u32) -> Self {
DagId { index: u }
}
fn tag(_: Option<Self>) -> &'static str {
"DagId"
}
}