# Type Definition parking_lot::MappedRwLockReadGuard [−] [src]

    type MappedRwLockReadGuard<'a, T> = MappedRwLockReadGuard<'a, RawRwLock, T>;

An RAII read lock guard returned by `RwLockReadGuard::map`, which can point to a subfield of the protected data.

The main difference between `MappedRwLockReadGuard` and `RwLockReadGuard` is that the former doesn’t support temporarily unlocking and re-locking, since that could introduce soundness issues if the locked object is modified by another thread.