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23 lines
569 B
Rust
23 lines
569 B
Rust
pub(crate) trait Counter: salsa::Database {
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fn increment(&self) -> usize;
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}
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#[salsa::query_group(GroupStruct)]
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pub(crate) trait Database: Counter {
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fn memoized(&self) -> usize;
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#[salsa::volatile]
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fn volatile(&self) -> usize;
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}
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/// Because this query is memoized, we only increment the counter
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/// the first time it is invoked.
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fn memoized(db: &impl Database) -> usize {
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db.volatile()
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}
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/// Because this query is volatile, each time it is invoked,
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/// we will increment the counter.
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fn volatile(db: &impl Database) -> usize {
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db.increment()
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}
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