salsa/tests/transparent.rs
Niko Matsakis fad97eeb6a remove the DB parameter
This had two unexpected consequences, one unfortunate, one "medium":

* All `salsa::Database` must be `'static`. This falls out from
`Q::DynDb` not having access to any lifetimes, but also the defaulting
rules for `dyn QueryGroup` that make it `dyn QueryGroup + 'static`. We
don't really support generic databases anyway yet so this isn't a big
deal, and we can add workarounds later (ideally via GATs).

* It is now statically impossible to invoke `snapshot` from a query,
and so we don't need to test that it panics. This is because the
signature of `snapshot` returns a `Snapshot<Self>` and that is not
accessible to a `dyn QueryGroup` type. Similarly, invoking
`Runtime::snapshot` directly is not possible becaues it is
crate-private. So I removed the test. This seems ok, but eventually I
would like to expose ways for queries to do parallel
execution (matklad and I had talked about a "speculation" primitive
for enabling that).

* This commit is 99% boilerplate I did with search-and-replace. I also
rolled in a few other changes I might have preferred to factor out,
most notably removing the `GetQueryTable` plumbing trait in favor of
free-methods, but it was awkward to factor them out and get all the
generics right (so much simpler in this version).
2020-07-04 14:17:11 +00:00

39 lines
800 B
Rust

//! Test that transparent (uncached) queries work
#[salsa::query_group(QueryGroupStorage)]
trait QueryGroup {
#[salsa::input]
fn input(&self, x: u32) -> u32;
#[salsa::transparent]
fn wrap(&self, x: u32) -> u32;
fn get(&self, x: u32) -> u32;
}
fn wrap(db: &dyn QueryGroup, x: u32) -> u32 {
db.input(x)
}
fn get(db: &dyn QueryGroup, x: u32) -> u32 {
db.wrap(x)
}
#[salsa::database(QueryGroupStorage)]
#[derive(Default)]
struct Database {
storage: salsa::Storage<Self>,
}
impl salsa::Database for Database {}
#[test]
fn transparent_queries_work() {
let mut db = Database::default();
db.set_input(1, 10);
assert_eq!(db.get(1), 10);
assert_eq!(db.get(1), 10);
db.set_input(1, 92);
assert_eq!(db.get(1), 92);
assert_eq!(db.get(1), 92);
}