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feat(ecs): #80 entity-pool stats (Pool.live/free/reserved/capacity)
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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>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-02 08:23:58 +03:00
parent f2cb3cd7e8
commit 347352cc4c
10 changed files with 25580 additions and 25382 deletions
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14
docs/language/pool/pool-reserved.md Normal file
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---
id: pool-reserved
name: Pool.reserved
category: pool
kind: namespace-method
tokens: Pool.reserved
sig: Pool.reserved() -> int
tip: High-water: how many slots have ever been allocated.
order: 3
ns: Pool
member: reserved
---
Returns the high-water mark — how many entity slots have ever been allocated. It only grows when a <code>spawn</code> finds the freelist empty; a spawn that reuses a freed slot leaves it unchanged, so a steady-state spawn/despawn loop keeps <code>reserved</code> flat (the proof that slots are pooled, not reallocated).