From cb893e1e5e4820cb800836cf6b8a79a1cd986cdc Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Thu, 22 Jul 2021 18:34:47 +0800
Subject: *misc

---
 Assets/Scripts/Utils/ListPool.cs | 65 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Assets/Scripts/Utils/ListPool.cs

(limited to 'Assets/Scripts/Utils/ListPool.cs')

diff --git a/Assets/Scripts/Utils/ListPool.cs b/Assets/Scripts/Utils/ListPool.cs
new file mode 100644
index 00000000..b9fbd2b8
--- /dev/null
+++ b/Assets/Scripts/Utils/ListPool.cs
@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+
+public static class ListPool<T>
+{
+    public static List<T> Get()
+    {
+        return ListPool<T>.m_ListPool.Get();
+    }
+
+    public static void Release(List<T> toRelease)
+    {
+        ListPool<T>.m_ListPool.Release(toRelease);
+    }
+
+    private static readonly ObjectPool<List<T>> m_ListPool = new ObjectPool<List<T>>(null, delegate (List<T> l)
+    {
+        l.Clear();
+    });
+}
+
+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);
+    }
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0