| /// Represents the result of a non-blocking read from a [DashMap](crate::DashMap). |
| #[derive(Debug)] |
| pub enum TryResult<R> { |
| /// The value was present in the map, and the lock for the shard was successfully obtained. |
| Present(R), |
| /// The shard wasn't locked, and the value wasn't present in the map. |
| Absent, |
| /// The shard was locked. |
| Locked, |
| } |
| |
| impl<R> TryResult<R> { |
| /// Returns `true` if the value was present in the map, and the lock for the shard was successfully obtained. |
| pub fn is_present(&self) -> bool { |
| matches!(self, TryResult::Present(_)) |
| } |
| |
| /// Returns `true` if the shard wasn't locked, and the value wasn't present in the map. |
| pub fn is_absent(&self) -> bool { |
| matches!(self, TryResult::Absent) |
| } |
| |
| /// Returns `true` if the shard was locked. |
| pub fn is_locked(&self) -> bool { |
| matches!(self, TryResult::Locked) |
| } |
| |
| /// If `self` is [Present](TryResult::Present), returns the reference to the value in the map. |
| /// Panics if `self` is not [Present](TryResult::Present). |
| pub fn unwrap(self) -> R { |
| match self { |
| TryResult::Present(r) => r, |
| TryResult::Locked => panic!("Called unwrap() on TryResult::Locked"), |
| TryResult::Absent => panic!("Called unwrap() on TryResult::Absent"), |
| } |
| } |
| |
| /// If `self` is [Present](TryResult::Present), returns the reference to the value in the map. |
| /// If `self` is not [Present](TryResult::Present), returns `None`. |
| pub fn try_unwrap(self) -> Option<R> { |
| match self { |
| TryResult::Present(r) => Some(r), |
| _ => None, |
| } |
| } |
| } |