understanding macd

Understanding and understanding of events A class or object can notify other classes or objects of related events through events. The publisher determines when an event is triggered, and the user determines the operation to be performed to respond to the event. In C #, event processing is actually a kind of delegate with special signatures. Assume that the student receives the score immediately after the in

A deep understanding of the C ++ object model and a deep understanding of the c Object Model The C ++ object model is an important knowledge point. It learns the memory model of the C ++ object, you can understand the polymorphism principle in C ++, the class initialization sequence, and the class size.1 C ++ object model basics What are there in 1.1 C ++ objects? The C ++ object includes the following: S

Deep understanding of PHP kernel (5) variables and data types-structure and type of variables, and deep understanding of the kernel Link: http://www.orlion.ga/238/ Programming Language types can be divided into strong type and weak type. PHP is a weak type language, but C is a strong type language. Internally implemented in PHP on the official website, all variables are saved using the same data structure (

Methods for optimizing PHP programs (for better understanding) and for better understanding of php programs 1. If a method c ++ an be static, declare it static. Speed improvement is by a factor of 4. If a method can be static, make a static Declaration on it. The speed can be increased to 4 times. 2. echo is faster than print. echo is faster than print. 3. Use echo's multiple parameters instead of string co

Preliminary understanding of processes and multithreading and deadlocks, and multi-thread understanding of processes Concept:ProcessIt is an execution activity on a computer, a dynamic execution process of a program, and a unit of resource allocation by the operating system. When a program is run, a process is started.ProcessAttackers can access processes on local or remote computers and start and stop proc

nesting2. For CSS and JS1) Try to use the outer chain CSS style sheet and JS script. The structure, performance and behavior are divided into three blocks, which conform to the norm. At the same time, improve the page rendering speed, improve the user experience.2) style as little as possible with the line style sheet, so that the structure and performance of the separation, tag ID and class attributes such as the name to see explanatory, the less the label, loading faster, user experience, cod

In the end, how high is the height of this line-height line:In the inline box model, there is a line boxes, this thing is invisible, the work of this thing is wrapped in every word. A line of text boxes. For example, "Iverson retired" The 5 words, if they are displayed in a row, you Iverson again, sorry, only a line boxes cover you; but "Chun Brother pure Man" 5 words, if the vertical writing, one line, that is really enough man, a word to cover the lines boxes, So a total of five line boxes. Li

instance=new Singletonclass ();135 } 136 } 137 }138 return instance;139 } $ }*/141 /***142 * Recommended Usage143 */144 /*Public class singletonclass{145 Private Singletonclass () {}146 static inner class of//java147 private static Class singletonclassinstance{148 private static final Singletonclass instance=new Singletonclass ();149 } Max Public static Singletonclass getinstance () {151 return singletonclassinstance.instance; the

, Hp's Alpha and Pa-risc series, and the Sun's UltraSPARC Series. Using the Harvard bus structure, single-cycle execution instructions, can achieve efficient pipeline operation, oriented to high-level language.The complex instruction set cisc, the program each instruction serially executes sequentially, this kind of control is relatively simple, but the computer parts utilization is low, the instruction is unequal, the instruction number is many, therefore the programming and the design processo

Understanding of the continuum hypothesis in macroscopic mechanics:Macroscopic mechanics (such as fluid mechanics, elasto-plastic mechanics, etc.) are the objects of a large number of molecules, at this time each set constitutes a small micro-body, the whole object is made up of the countless small micro-bodies continuously without gaps in the composition. Because we only need to pay attention to the nature of the objects on each set, such as density,

ThreadLocal: simple understanding and threadlocal understandingIn the code of the java open-source project, you can see the ThreadLocal attribute in a class: private static ThreadLocal I saw ThreadLocal while reading a book, but suddenly I couldn't remember its usefulness .. I was surprised to find that I had read the book. So I checked it online immediately.It originally meant the local variable of the thread. ThreadLocal is more like a tool class fo

If you encounter this problem at work, you only know the alignment of the vertical-align attribute settings. Therefore, you need to thoroughly understand the vertical-align function and sort it out by the way. First, let's take a look at some vertical-align attributes: Value Description Baseline Default value. The element is placed on the base line of the parent element. Sub Vertical align text subscript. Super Vertical Alignment

Preliminary understanding of GCD and understanding of GCD // (1) use an asynchronous function to add tasks to the concurrent queue. // conclusion: Enable three subthreads at the same time-(void) test1 {// 1. obtain the global concurrent queue dispatch_queue_t queue = dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); // 2. after adding a task to the queue, You can execute the task // asynchrono

An in-depth understanding of Linux Network Technology-Virtual Device initialization summary and a deep understanding of linuxOverview a virtual device is an abstraction built on one or more real devices. There are many to many mappings between virtual devices and real devices, but not all combinations can be defined or supported by the kernel.The following lists some common Virtual Devices: Bonding // bindi

Understanding of fork () functions, and understanding of fork FunctionsAuthor:Wang Shanshan, a lecturer at Huaqing vision embedded College. For those who are new to Unix/Linux operating systems and Write multi-process programs in Linux, fork is one of the most difficult concepts to understand: it returns two values after one execution. First, let's look at the prototype of the fork function: # I nclude # I

GCD encapsulation of personal understanding and application, gcd encapsulation of understandingPersonal Understanding and applications encapsulated by GCD Features > GCD encapsulation frees us from tedious Method Memory and enables direct and fast application. Usage 1. Drag nine GCD files in the project into your project (you 'd better create a folder to save these files for easy management !).

First understanding heat map, first understanding heat Recently, the project asked me to use js Code to implement heat map. A brother in the same group then turned it into an actionscript code based on my js Code. So I searched the internet for a lot of information on heat map implementation: 1. Google Analytic Google Analytics heat map is a new version of Web Page clickthrough visualization tool called Web

Deep understanding of Java Virtual Machine notes-class loading process, deep understanding of virtual machinesI. LoadingThe Loading stage is a stage of the Class Loading process. In the loading phase, the virtual machine must complete the following three tasks:A. Get the binary byte stream that defines this class using the full limit name of a class.B. Convert the static storage structure represented by thi

First understanding of PHP (1) basic syntax, first understanding of php basic syntax I have been preparing to learn PHP, but there was always a problem some time ago, which was delayed for a while. Catch up now! This series only talks about some of my views on PHP, not the nature of the tutorial. In addition, I am a little white, just write casually, please pat. I have studied c, java, python, and HTML. If

In-depth understanding of URL encoding in the Web, in-depth understanding of weburl Web development is inseparable from URLs. URLs are URLs. network standards stipulate that only letters and numbers [0-9a-zA-Z] and some special symbols "$-_. +" are allowed! * '(), "[Excluding parentheses], and reserved words can be directly used for URL without encoding. Therefore, to make our website accessible normally,