1 files changed, 46 insertions, 0 deletions
diff --git a/vendor/dashmap/src/try_result.rs b/vendor/dashmap/src/try_result.rs
new file mode 100644
index 000000000..aa93d3b2c
--- /dev/null
+++ b/vendor/dashmap/src/try_result.rs
@@ -0,0 +1,46 @@
+/// 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,
+        }
+    }
+}