language-servers/roc
1
0
Fork 0
mirror of https://github.com/roc-lang/roc.git synced 2025-10-02 16:21:11 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 6

exploiting exactsizeiterator

Browse source
This commit is contained in:
Folkert 2022-03-02 21:08:14 +01:00
parent 54c6292b4b
commit 8d2e0a738c
No known key found for this signature in database
GPG key ID: 1F17F6FFD112B97C
2 changed files with 21 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

21
compiler/can/src/constraint_soa.rs
View file

@ -217,6 +217,7 @@ impl Constraints {
where
I: IntoIterator<Item = Variable>,
C: IntoIterator<Item = Constraint>,
C::IntoIter: ExactSizeIterator,
{
let defs_constraint = self.and_constraint(defs_constraint);
@ -268,20 +269,28 @@ impl Constraints {
Constraint::Let(let_index)
}
#[must_use]
pub fn and_constraint<I>(&mut self, constraints: I) -> Constraint
where
I: IntoIterator<Item = Constraint>,
I::IntoIter: ExactSizeIterator,
{
let start = self.constraints.len() as u32;
let mut it = constraints.into_iter();
self.constraints.extend(constraints);
match it.len() {
0 => Constraint::True,
1 => it.next().unwrap(),
_ => {
let start = self.constraints.len() as u32;
let end = self.constraints.len() as u32;
self.constraints.extend(it);
let slice = Slice::new(start, (end - start) as u16);
let end = self.constraints.len() as u32;
Constraint::And(slice)
let slice = Slice::new(start, (end - start) as u16);
Constraint::And(slice)
}
}
}
pub fn lookup(