Unity对象池简单实现（UGUI内核源码）

internal class ObjectPool<T> where T : new()

{

private readonly Stack<T> m_Stack = new Stack<T>();

private readonly UnityAction<T> m_ActionOnGet;

private readonly UnityAction<T> m_ActionOnRelease;

public int countAll { get; private set; }

public int countActive { get { return countAll - countInactive; } }

public int countInactive { get { return m_Stack.Count; } }

public ObjectPool(UnityAction<T> actionOnGet, UnityAction<T> actionOnRelease)

{

m_ActionOnGet = actionOnGet;

m_ActionOnRelease = actionOnRelease;

}

public T Get()

{

T element;

if (m_Stack.Count == 0)

{

element = new T();

countAll++;

}

else

{

element = m_Stack.Pop();

}

if (m_ActionOnGet != null)

m_ActionOnGet(element);

return element;

}

public void Release(T element)

{

if (m_Stack.Count > 0 && ReferenceEquals(m_Stack.Peek(), element))

Debug.LogError("Internal error. Trying to destroy object that is already released to pool.");

if (m_ActionOnRelease != null)

m_ActionOnRelease(element);

m_Stack.Push(element);

}

}