using System.Collections.Concurrent;

public class ObjectPool<T>

{

private readonly ConcurrentBag<T> _objects;

private readonly Func<T> _objectGenerator;

/// <summary>

/// Initializes the ObjectPool.

/// </summary>

/// <param name="objectGenerator">We need a generator function to create an object if our pool is empty.</param>

public ObjectPool(Func<T> objectGenerator)

{

_objectGenerator = objectGenerator ?? throw new ArgumentNullException(nameof(objectGenerator));

_objects = new ConcurrentBag<T>();

}

public T Rent() => _objects.TryTake(out T item) ? item : _objectGenerator();

public void Return(T item) => _objects.Add(item);

}