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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.
46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
//! Test that `specify` only works if the key is a tracked struct created in the current query.
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//! compilation succeeds but execution panics
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#![allow(warnings)]
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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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struct MyTracked<'db> {
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field: u32,
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}
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#[salsa::tracked]
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fn tracked_struct_created_in_another_query<'db>(
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db: &'db dyn salsa::Database,
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input: MyInput,
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) -> MyTracked<'db> {
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MyTracked::new(db, input.field(db) * 2)
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}
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#[salsa::tracked]
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fn tracked_fn<'db>(db: &'db dyn salsa::Database, input: MyInput) -> MyTracked<'db> {
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let t = tracked_struct_created_in_another_query(db, input);
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if input.field(db) != 0 {
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tracked_fn_extra::specify(db, t, 2222);
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}
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t
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}
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#[salsa::tracked(specify)]
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fn tracked_fn_extra<'db>(_db: &'db dyn salsa::Database, _input: MyTracked<'db>) -> u32 {
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0
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}
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#[test]
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#[should_panic(
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expected = "can only use `specify` on salsa structs created during the current tracked fn"
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)]
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fn execute_when_specified() {
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let mut db = salsa::DatabaseImpl::new();
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let input = MyInput::new(&db, 22);
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let tracked = tracked_fn(&db, input);
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}
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