+init

1 files changed, 48 insertions, 0 deletions

diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Utility/ObjectPool.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Utility/ObjectPool.cs
new file mode 100644
index 0000000..b506d80
--- /dev/null
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Utility/ObjectPool.cs
@@ -0,0 +1,48 @@
+using System.Collections.Generic;
+using UnityEngine.Events;
+
+namespace UnityEngine.UI
+{
+    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);
+        }
+    }
+}