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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).
55 lines
1.2 KiB
Rust
55 lines
1.2 KiB
Rust
use crate::log::HasLog;
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#[salsa::query_group(Gc)]
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pub(crate) trait GcDatabase: salsa::Database + HasLog {
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#[salsa::input]
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fn min(&self) -> usize;
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#[salsa::input]
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fn max(&self) -> usize;
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#[salsa::input]
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fn use_triangular(&self, key: usize) -> bool;
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fn fibonacci(&self, key: usize) -> usize;
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fn triangular(&self, key: usize) -> usize;
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fn compute(&self, key: usize) -> usize;
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fn compute_all(&self) -> Vec<usize>;
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}
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fn fibonacci(db: &dyn GcDatabase, key: usize) -> usize {
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db.log().add(format!("fibonacci({:?})", key));
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if key == 0 {
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0
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} else if key == 1 {
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1
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} else {
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db.fibonacci(key - 1) + db.fibonacci(key - 2)
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}
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}
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fn triangular(db: &dyn GcDatabase, key: usize) -> usize {
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db.log().add(format!("triangular({:?})", key));
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if key == 0 {
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0
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} else {
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db.triangular(key - 1) + key
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}
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}
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fn compute(db: &dyn GcDatabase, key: usize) -> usize {
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db.log().add(format!("compute({:?})", key));
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if db.use_triangular(key) {
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db.triangular(key)
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} else {
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db.fibonacci(key)
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}
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}
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fn compute_all(db: &dyn GcDatabase) -> Vec<usize> {
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db.log().add("compute_all()");
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(db.min()..db.max()).map(|v| db.compute(v)).collect()
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}
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