Compatibility and Features

MSRV

CacheKit targets the Rust MSRV listed in Cargo.toml and reflected in the README badge.

Each eviction policy can be enabled or disabled via its own feature flag. This keeps builds smaller when you only need specific policies.

Feature	Policy	Description
`policy-fifo`	FIFO	First In, First Out
`policy-lru`	LRU	Least Recently Used (Arc-wrapped, `ConcurrentLruCache` available)
`policy-fast-lru`	Fast LRU	Optimized single-threaded LRU (~7–10× faster than LRU)
`policy-lru-k`	LRU-K	Scan-resistant with K-th access
`policy-lfu`	LFU	Least Frequently Used (bucket-based)
`policy-heap-lfu`	Heap LFU	LFU with heap-based eviction
`policy-two-q`	2Q	Two-Queue
`policy-s3-fifo`	S3-FIFO	Scan-resistant three-queue FIFO
`policy-arc`	ARC	Adaptive Replacement Cache
`policy-lifo`	LIFO	Last In, First Out
`policy-mfu`	MFU	Most Frequently Used
`policy-mru`	MRU	Most Recently Used
`policy-random`	Random	Random eviction
`policy-slru`	SLRU	Segmented LRU
`policy-clock`	Clock	Second-chance clock
`policy-clock-pro`	Clock-PRO	Scan-resistant clock
`policy-nru`	NRU	Not Recently Used

Default features include policy-s3-fifo, policy-lru, policy-fast-lru, policy-lru-k, and policy-clock.

Convenience feature: policy-all enables every policy above.

Minimal builds: Use default-features = false and select only the policies you need:

[dependencies]
cachekit = { version = "0.3", default-features = false, features = ["policy-lru", "policy-s3-fifo"] }