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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.
17 lines
372 B
Rust
17 lines
372 B
Rust
//! Test that creating a tracked struct outside of a
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//! tracked function panics with an assert message.
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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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#[test]
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#[should_panic(
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expected = "cannot create a tracked struct disambiguator outside of a tracked function"
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)]
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fn execute() {
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let db = salsa::DatabaseImpl::new();
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MyTracked::new(&db, 0);
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}
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