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use std::collections::hash_map::Entry as StdEntry;
use std::marker::PhantomData;
use cell::TrustCell;
use res::{FetchMut, Resource, ResourceId};
pub struct Entry<'a, T: 'a> {
inner: StdEntry<'a, ResourceId, TrustCell<Box<Resource>>>,
marker: PhantomData<T>,
}
impl<'a, T> Entry<'a, T>
where
T: Resource + 'a,
{
pub fn or_insert(self, v: T) -> FetchMut<'a, T> {
self.or_insert_with(move || v)
}
pub fn or_insert_with<F>(self, f: F) -> FetchMut<'a, T>
where
F: FnOnce() -> T,
{
let value = self.inner
.or_insert_with(move || TrustCell::new(Box::new(f())));
let inner = value.borrow_mut();
FetchMut {
inner,
phantom: PhantomData,
}
}
}
pub fn create_entry<'a, T>(e: StdEntry<'a, ResourceId, TrustCell<Box<Resource>>>) -> Entry<'a, T> {
Entry {
inner: e,
marker: PhantomData,
}
}
#[cfg(test)]
mod tests {
use res::Resources;
#[test]
fn test_entry() {
struct Res;
let mut res = Resources::new();
res.entry().or_insert(Res);
assert!(res.has_value::<Res>());
}
}