combines two 64 bit hash into one

increments the refcount for the current cohort. Optimisitically assumes the cohort is not switching. Just increment and if it actually changed in the

Return a mutable view

* Helper to automatically measure latency & update counters in a scope. * Returns an non-empty std::optional if sampled for latency measurement.

Attaches buffer 'buf' to the region.

get the size of the value.

returns true if the slab allocator can be restored through serialized state. This is a precondition to calling saveState.

Get the number of stored entries

Expect regions specified to be tracked exactly once and in order

returns the slab corresponding to the idx, irrespective of the validity of the memory. The caller can use isValidSlab to check if the returned slab is

Gets the number of items in this region.

returns the size of the NVM space used for caching

TODO: add unit tests

============ Device settings ============= Set the device block size, i.e., minimum unit of IO

accessor. Calling getInternal() on handle with isReady() == false blocks the thread until the handle is ready.

Gets the end offset of last slot added to this region.

* return the total size of currently used chunks (virtual function). This * could be different from the configured size since the resizing happens