偶然看到 Array.Copy 方法的时候,想到,它是否是克隆,又是否是深克隆. 做了一个测试 public class abc { public string hello; } [TestMethod] public void TestArrayCopy() { abc a = new abc(); a.hello = "hello "; ]; Array.Copy(); ]; b.hello = "world"; Console.WriteLine(a.hell…

static void Main(string[] args) { , , , , , }; ;//目标数组大小 int int_size = sizeof(int);//用于获取值类型的字节大小. int[] dest = new int[destLen]; //只支持基元类型,按字节偏移复制 Buffer.BlockCopy(src, (src.Length - destLen) * int_size, dest, , destLen * int_size); foreach (var i…

var bt = new byte[] { 0x03, 0x00, 0x01, 0xD9, 0x23 }; var result = new byte[] { 0x01, 0x00, 0x03, 0x00, 0xFC }; var tmp = new byte[5]; _sp.Write(bt, 0, bt.Length); Thread.Sleep(500); var recive = new byte[_sp.BytesToRead]; _sp.Read(recive, 0, _sp.Byt…

Swift Array copy 的线程安全问题 NSArray 继承自 NSObject,属于对象,有 copy 方法.Swift 的 Array 是 struct,没有 copy 方法.把一个 Array 变量赋值给另一个变量,两个变量的内存地址相同吗?与此相关的有多线程安全问题.本文探究这两个问题. 内存地址 定义测试 class 和 struct class MyClass { var intArr = [Int]() var structArr = [MyStructElement](…

无聊做了如题的一个算法的优劣性能比较,由于很多人都只关心结果,那么我先贴出结果如下: 由于我的测试数据量比较小,只能得出Array.Copy()和Buffer.BlockCopy()方法性能要好于Contact(),这个不用比较也能想到,如果想知道前两个谁的性能更好, 有兴趣的可以修改源码中的测试数据量就可以了. 测试源码如下: ; ; static byte[] bytes0 = new byte[len1]; static byte[] bytes1 = new byte[len2]; st…

http://stackoverflow.com/questions/1389821/array-copy-vs-buffer-blockcopy Since the parameters to Buffer.BlockCopy are byte-based rather than index-based, you're more likely to screw up your code than if you use Array.Copy, so I would only use Buffer…

array中的某些数据坏掉,想要统一处理,找到了这个方法,做个笔记. 比如,把数组中所有小于0的数字置为0 import numpy as np t = np.array([-2, -1, 0, 1, 2]) t[t<0]=0 输出结果为 [0,0,0,1,2]…

Start Windows PowerShell Start > search for "PowerShell" > Start Windows PowerShell by clicking on "Run as Administrator". Connect the Windows PowerShell to Office 365 Exchange Online . Please execute below command in PowerShell.…

goal: # # Copyright 2010 (c) Pointwise, Inc. # All rights reserved. # # This sample Pointwise script is not supported by Pointwise, Inc. # It is provided freely for demonstration purposes only. # SEE THE WARRANTY DISCLAIMER AT THE BOTTOM OF THIS FILE…

通过cygwin在WINDOWS系统上安装SSH服务 并使用scp命令进行上传和下载文件.按照步骤参考如下 https://jingyan.baidu.com/article/08b6a591a5048b14a809220b.html 拷贝数据的命令文件参考如下 http://www.360doc.com/content/13/0425/23/3810344_280963267.shtml…