匿名函數訪問外部變數有gc

標籤：public   外部   inf   obj   log   cal   vat   class   ack   

 

直接上測試代碼：

using System.Collections;using System.Collections.Generic;using UnityEngine;public class TestStructGC : MonoBehaviour{    public struct StructDef    {        public System.Action act;        public StructDef(System.Action callback)        {            act = callback;        }    }    public int memberValue;    private void Update()    {        // 使用匿名函數，不訪問外部函數，0 gc        {            UnityEngine.Profiling.Profiler.BeginSample("*** Test1 ***");            StructDef obj = new StructDef(null);            UnityEngine.Profiling.Profiler.EndSample();        }        // 使用匿名函數，訪問臨時變數，112B gc        {            int tmp = 1;            UnityEngine.Profiling.Profiler.BeginSample("*** Test2 ***");            StructDef obj = new StructDef(() => { var v = tmp; });            UnityEngine.Profiling.Profiler.EndSample();        }        // 使用匿名函數，訪問外部變數，112B gc        {            UnityEngine.Profiling.Profiler.BeginSample("*** Test3 ***");            StructDef obj = new StructDef(() =>            {                Debug.LogError(memberValue);            });            UnityEngine.Profiling.Profiler.EndSample();        }        // 不使用匿名函數，0 gc        {            UnityEngine.Profiling.Profiler.BeginSample("*** Test4 ***");            StructDef obj = new StructDef(actCallback);            UnityEngine.Profiling.Profiler.EndSample();        }    }    #region optimize for test4    private System.Action actCallback;    public TestStructGC()    {        actCallback = LocalCallback;    }    private void LocalCallback()    {        Debug.LogError(memberValue);    }    #endregion}

參考：https://blog.uwa4d.com/archives/Anonymous_heapmemory.html

 

匿名函數訪問外部變數有gc