git.delta.rocks / unique-network / refs/commits / ae913530fe53

875875
876enum LazyValueState<'a, T> {876enum LazyValueState<'a, T> {
877	Pending(Box<dyn FnOnce() -> T + 'a>),877	Pending(Box<dyn FnOnce() -> T + 'a>),
878	InProgress(PhantomData<sp_std::cell::Cell<T>>),878	InProgress,
879	Computed(T),879	Computed(T),
880}880}
881881
930			return;930			return;
931		}931		}
932932
933		match sp_std::mem::replace(&mut self.state, InProgress(PhantomData)) {933		match sp_std::mem::replace(&mut self.state, InProgress) {
934			Pending(f) => self.state = Computed(f()),934			Pending(f) => self.state = Computed(f()),
935			_ => {935			_ => panic!("recursion isn't supported"),
936				// Computed is ruled out by the above condition
937				// InProgress is ruled out by not implementing Sync and absence of recursion
938				unreachable!()
939			}
940		}936		}
941	}937	}
942}938}