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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.
62 lines
1.7 KiB
Rust
62 lines
1.7 KiB
Rust
//! Test that a `tracked` fn on a `salsa::input`
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//! compiles and executes successfully.
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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};
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use test_log::test;
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#[salsa::input]
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struct MyInput {
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field: u32,
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}
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#[salsa::tracked]
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fn final_result(db: &dyn LogDatabase, input: MyInput) -> u32 {
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db.push_log(format!("final_result({:?})", input));
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intermediate_result(db, input).field(db) * 2
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}
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#[salsa::tracked]
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struct MyTracked<'db> {
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field: u32,
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}
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#[salsa::tracked]
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fn intermediate_result(db: &dyn LogDatabase, input: MyInput) -> MyTracked<'_> {
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db.push_log(format!("intermediate_result({:?})", input));
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MyTracked::new(db, input.field(db) / 2)
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}
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#[test]
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fn execute() {
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let mut db: DatabaseImpl<Logger> = Default::default();
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let input = MyInput::new(&db, 22);
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assert_eq!(final_result(&db, input), 22);
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db.assert_logs(expect![[r#"
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[
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"final_result(MyInput { [salsa id]: Id(0), field: 22 })",
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"intermediate_result(MyInput { [salsa id]: Id(0), field: 22 })",
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]"#]]);
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// Intermediate result is the same, so final result does
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// not need to be recomputed:
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input.set_field(&mut db).to(23);
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assert_eq!(final_result(&db, input), 22);
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db.assert_logs(expect![[r#"
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[
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"intermediate_result(MyInput { [salsa id]: Id(0), field: 23 })",
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]"#]]);
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input.set_field(&mut db).to(24);
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assert_eq!(final_result(&db, input), 24);
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db.assert_logs(expect![[r#"
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[
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"intermediate_result(MyInput { [salsa id]: Id(0), field: 24 })",
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"final_result(MyInput { [salsa id]: Id(0), field: 24 })",
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]"#]]);
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}
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