Module meta 

Algorithm-specific metadata types.

Provides metadata structures for each cache algorithm:

• LfuMeta: Frequency counter for LFU
• LfudaMeta: Frequency for LFUDA (age is cache-global)
• SlruMeta: Segment location for SLRU
• GdsfMeta: Frequency and priority for GDSF Algorithm-Specific Metadata Types

This module provides metadata types used by different cache algorithms. Each cache algorithm that needs per-entry metadata defines its own type here, which can be used with CacheEntry<K, V, M>.

Metadata Types

Algorithm	Metadata Type	Description
LRU	() (none)	Position in list is implicit
LFU	LfuMeta	Access frequency counter
LFUDA	LfudaMeta	Access frequency (age is cache-global)
SLRU	SlruMeta	Segment location (probationary/protected)
GDSF	GdsfMeta	Frequency and calculated priority

Memory Overhead

Metadata Type	Size
()	0 bytes
LfuMeta	8 bytes
LfudaMeta	8 bytes
SlruMeta	1 byte (+ padding)
GdsfMeta	16 bytes

Usage

use cache_rs::meta::{LfuMeta, SlruSegment, SlruMeta, GdsfMeta};

// LFU metadata with initial frequency
let lfu_meta = LfuMeta::default();
assert_eq!(lfu_meta.frequency, 0);

// SLRU metadata for probationary segment
let slru_meta = SlruMeta::new(SlruSegment::Probationary);
assert_eq!(slru_meta.segment, SlruSegment::Probationary);

// GDSF metadata with initial values
let gdsf_meta = GdsfMeta::default();
assert_eq!(gdsf_meta.frequency, 0);
assert_eq!(gdsf_meta.priority, 0.0);

Structs

GdsfMeta

Metadata for GDSF (Greedy Dual-Size Frequency) cache entries.

LfuMeta

Metadata for LFU (Least Frequently Used) cache entries.

LfudaMeta

Metadata for LFUDA (LFU with Dynamic Aging) cache entries.

SlruMeta

Metadata for SLRU (Segmented LRU) cache entries.

Enums

SlruSegment

Segment location within an SLRU cache.