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daaa78056a
Under this design, *all* databases are a `DatabaseImpl<U>`, where the `U` implements `UserData` (you can use `()` if there is none). Code would default to `&dyn salsa::Database` but if you want to give access to the userdata, you can define a custom database trait `MyDatabase: salsa::Databse` so long as you * annotate `MyDatabase` trait definition of impls of `MyDatabase` with `#[salsa::db]` * implement `MyDatabase` for `DatabaseImpl<U>` where `U` is your userdata (this could be a blanket impl, if you don't know the precise userdata type). The `tests/common/mod.rs` shows the pattern.
50 lines
1 KiB
Rust
50 lines
1 KiB
Rust
mod common;
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use common::{LogDatabase, Logger};
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use expect_test::expect;
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use salsa::{DatabaseImpl, Setter as _};
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#[salsa::input]
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struct Input {
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number: i16,
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}
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#[salsa::tracked(no_eq)]
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fn abs_float(db: &dyn LogDatabase, input: Input) -> f32 {
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let number = input.number(db);
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db.push_log(format!("abs_float({number})"));
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number.abs() as f32
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}
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#[salsa::tracked]
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fn derived(db: &dyn LogDatabase, input: Input) -> u32 {
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let x = abs_float(db, input);
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db.push_log("derived".to_string());
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x as u32
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}
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#[test]
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fn invoke() {
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let mut db: DatabaseImpl<Logger> = Default::default();
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let input = Input::new(&db, 5);
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let x = derived(&db, input);
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assert_eq!(x, 5);
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input.set_number(&mut db).to(-5);
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// Derived should re-execute even the result of `abs_float` is the same.
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let x = derived(&db, input);
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assert_eq!(x, 5);
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db.assert_logs(expect![[r#"
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[
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"abs_float(5)",
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"derived",
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"abs_float(-5)",
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"derived",
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]"#]]);
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}
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