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https://github.com/salsa-rs/salsa.git
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fad97eeb6a
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).
52 lines
1 KiB
Rust
52 lines
1 KiB
Rust
#[salsa::query_group(HelloWorld)]
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trait HelloWorldDatabase: salsa::Database {
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#[salsa::input]
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fn input(&self, a: u32, b: u32) -> u32;
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fn none(&self) -> u32;
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fn one(&self, k: u32) -> u32;
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fn two(&self, a: u32, b: u32) -> u32;
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fn trailing(&self, a: u32, b: u32) -> u32;
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}
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fn none(_db: &dyn HelloWorldDatabase) -> u32 {
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22
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}
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fn one(_db: &dyn HelloWorldDatabase, k: u32) -> u32 {
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k * 2
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}
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fn two(_db: &dyn HelloWorldDatabase, a: u32, b: u32) -> u32 {
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a * b
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}
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fn trailing(_db: &dyn HelloWorldDatabase, a: u32, b: u32) -> u32 {
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a - b
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}
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#[salsa::database(HelloWorld)]
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#[derive(Default)]
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struct DatabaseStruct {
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storage: salsa::Storage<Self>,
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}
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impl salsa::Database for DatabaseStruct {}
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#[test]
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fn execute() {
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let mut db = DatabaseStruct::default();
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// test what happens with inputs:
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db.set_input(1, 2, 3);
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assert_eq!(db.input(1, 2), 3);
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assert_eq!(db.none(), 22);
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assert_eq!(db.one(11), 22);
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assert_eq!(db.two(11, 2), 22);
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assert_eq!(db.trailing(24, 2), 22);
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}
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