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…

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](…

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…

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…

Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. Note:Try to come up as many solutions as you can, there are at least 3 different ways to solve this pro…

//浅拷贝: let arr=[1,2,3,4] let arr2=arr arr[3]=0 console.log(arr,arr2) //output: (4) [1, 2, 3, 0] (4) [1, 2, 3, 0] //深拷贝1: var arr3=[1,2,3,4] var arr4=[] for(var i=0;i<arr.length;i++){ arr4.push(arr3[i])} console.log(arr4) //output: (4) [1, 2, 3, 4] //…

总结:理解理解.重要啊 package com.a; import java.util.Arrays; public class FJKDLS { public static void main(String[] args) { int[] a = { 12, 3, 35, 43 }; int b[] = new int[a.length]; System.arraycopy(a, 0, b, 0, a.length); for (int i = 0; i < b.length; i++) {…