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|
use salsa::{Database, Setter};
#[salsa::tracked]
fn memoized(db: &dyn Database, input: MyInput) -> u32 {
memoized_a(db, MyTracked::new(db, input.field(db)))
}
#[salsa::tracked(cycle_fn=cycle_fn, cycle_initial=cycle_initial)]
fn memoized_a<'db>(db: &'db dyn Database, tracked: MyTracked<'db>) -> u32 {
MyTracked::new(db, 0);
memoized_b(db, tracked)
}
fn cycle_fn<'db>(
_db: &'db dyn Database,
_value: &u32,
_count: u32,
_input: MyTracked<'db>,
) -> salsa::CycleRecoveryAction<u32> {
salsa::CycleRecoveryAction::Iterate
}
fn cycle_initial(_db: &dyn Database, _input: MyTracked) -> u32 {
0
}
#[salsa::tracked]
fn memoized_b<'db>(db: &'db dyn Database, tracked: MyTracked<'db>) -> u32 {
let incr = tracked.field(db);
let a = memoized_a(db, tracked);
if a > 8 {
a
} else {
a + incr
}
}
#[salsa::input]
struct MyInput {
field: u32,
}
#[salsa::tracked]
struct MyTracked<'db> {
field: u32,
}
#[test]
fn cycle_memoized() {
let mut db = salsa::DatabaseImpl::new();
let input = MyInput::new(&db, 2);
assert_eq!(memoized(&db, input), 10);
input.set_field(&mut db).to(3);
assert_eq!(memoized(&db, input), 9);
}
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