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/// 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,
}
}
}