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ludic/docs/language/pool/pool-live.md
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feat(ecs): #80 entity-pool stats (Pool.live/free/reserved/capacity) 
Ludic's ECS is already pool-based — the allocator recycles freed entity slots
through a freelist (L_alloc pops @L_freen before growing @L_entc), and component
storage is fixed per-entity arrays, so spawn/despawn churn (bullet-hell/horde)
does no per-spawn heap allocation and cannot fragment. Expose that with a Pool.*
namespace so a game can watch reuse: Pool.live (alive now), Pool.free (recycled
slots waiting), Pool.reserved (high-water — stays flat across a steady
spawn/despawn loop, proving reuse not reallocation), Pool.capacity (the fixed
cap). Zero-cost inline reads of the existing counters.

Example pool.ludic proves the key property: after despawn+respawn,
Pool.reserved() stays 3 (freed slot reused) — prints 0 0 3 3 0 2 1 3 0 3 1.
4 docs pages. Full suite 118/0, goldens byte-identical, fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-09-02 08:23:58 +03:00

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id name category kind tokens sig tip order ns member
pool-live Pool.live pool namespace-method Pool.live Pool.live() -> int How many entities are currently alive. 1 Pool live

Returns the number of entities currently alive (reserved minus free). Despawning drops it and spawning raises it; a recycled slot does not change Pool.reserved.