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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.
32 lines
840 B
Text
32 lines
840 B
Text
error[E0308]: mismatched types
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--> tests/compile-fail/span-tracked-getter.rs:9:13
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9 | x.field(22);
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| ----- ^^ expected `&_`, found integer
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| |
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| arguments to this method are incorrect
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= note: expected reference `&_`
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found type `{integer}`
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note: method defined here
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--> tests/compile-fail/span-tracked-getter.rs:3:5
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1 | #[salsa::tracked]
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| -----------------
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2 | pub struct MyTracked<'db> {
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3 | field: u32,
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| ^^^^^
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help: consider borrowing here
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9 | x.field(&22);
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| +
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warning: variable does not need to be mutable
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--> tests/compile-fail/span-tracked-getter.rs:13:9
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13 | let mut db = salsa::DatabaseImpl::new();
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| ----^^
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| help: remove this `mut`
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= note: `#[warn(unused_mut)]` on by default
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