Module collections 

Zero-copy collections for on-chain account data.

All collections operate directly on byte slices – no heap allocation, no Vec, no Box. They are BPF-safe, deterministic, and audit-friendly.

Available Collections

• FixedVec – Bounded dynamic array with push/pop/swap_remove
• RingBuffer – Fixed-capacity circular buffer for journals/logs
• SlotMap – Fixed-slot map with generation counters for safe handles
• BitSet – Compact bit array for flags and bitmask operations

Re-exports

pub use journal::Journal;

pub use journal::JournalReader;

pub use journal::JOURNAL_HEADER_SIZE;

pub use slab::bitmap_bytes;

pub use slab::Slab;

pub use slab::SLAB_HEADER_SIZE;

Modules

journal

Append-only journal for on-chain audit trails.

slab

Fixed-size slab allocator for on-chain data.

Structs

BitSet

Compact bit array overlaid on a byte slice.

FixedVec

Bounded dynamic array overlaid on a byte slice.

PackedMap

Packed key->value map overlaid on a byte slice.

RingBuffer

Fixed-capacity circular buffer overlaid on a byte slice.

SlotMap

Fixed-slot map overlaid on a byte slice.

SortedVec

Sorted bounded dynamic array – zero-copy with O(log n) binary search.