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Reuse objects without allocations.

A lightweight generic object pool for Unity and pure C# projects. Provides Pool<T> for a single type and MultiPool<TKey, TValue> for managing multiple pools under a common key.

Table Of Contents

Details

• Installation
• Classes
• Usage
  • Pool<T>
  • MultiPool<TKey, TValue>
• Notes

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Installation

1. .unitypackage — Releases
2. UPM — Window → Package Manager → + → Add package from git URL: https://github.com/SST-Systems/Pooling.git Append #tag to pin a version.
3. Manual — clone or download, copy to Assets/.

Unity 2021.3+

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Classes

Pool<T> — a single typed pool.

MultiPool<TKey, TValue> — a dictionary of pools keyed by any type (typically System.Type). Lets you manage many pools through a single entry point.

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Usage

Pool<T>

var pool = new Pool<MyObject>(
    factory: () => new MyObject(),
    actionOnGet: obj => obj.Reset(),
    actionOnRelease: obj => obj.Cleanup()
);

// Prewarm — create instances ahead of time
pool.Prewarm(10);

// Get an instance (creates a new one if the pool is empty)
var obj = pool.Get();

// Return it
pool.Release(obj);

// Permanently remove an instance without returning it
pool.Discard(obj);

// Clear all instances
pool.DiscardAll();

MultiPool<TKey, TValue>

var multiPool = new MultiPool<Type, IHandler>();

// Register a factory for a specific key
multiPool.RegisterFactory(typeof(MyHandler), () => new MyHandler());

// Get and release by key
var handler = multiPool.Get(typeof(MyHandler));
multiPool.Release(typeof(MyHandler), handler);

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Notes

• Pool<T> tracks both free and occupied instances — double-releasing an instance is silently ignored.
• MultiPool throws KeyNotFoundException if you call Get before registering a factory for that key.

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License

Distributed under the MIT License. Free for personal and commercial use.

Author — Egor Shesterikov.