colons meaning

called by default, and if you want to invoke a global function with the same name, you must hit:: To show the difference. For example, in the VC, you can call the API function, in front of the API functions to add:. (Edit:)************************************************************************************************************************************************************************************************************************************************************************************

The periods (.), colons (:), and double colons (: :) operators in c ++1. colon (:) usage (1) represents the definition of the intra-organization bit domain (that is, the variable occupies several bit spaces)Typedef struct _ XXX {Unsigned char a: 4;Unsigned char c;} XXX;(2) The colon following the constructor acts as a segmentation function. It is a class-based method for assigning values to member variables

is defined outside the class,will be written as void A::f (), which indicates that the F () function is a member function of class A.(2) Directly before the global function, which means the global functionExample: In the VC, you can call the API function, in front of the API functions:(3) Representing reference member functions and variables, scope member operatorsExample: System::math::sqrt () equivalent to SYSTEM.MATH.SQRT ()——————————————————————————————————————VC in the following:: Is the s

Use colons in shell with equal signs, plus signs, and minus signsIn question 13, there were cases of colons and equal signs mentioned, with colons, as long as they are null (undefined, null) can be overwritten;If no colon exists, it can be overwritten only when it is undefined. However, the return value is not described in detail.1. colon and equal sign2. colon a

A single colon (:) used for CSS3 pseudo-classes, double colons (::) for CSS3 pseudo-elements.A pseudo-element consists of a double colon and a pseudo-element name. Double colons are introduced in the CSS3 specification to differentiate between pseudo-classes and pseudo-elements.But pseudo-class compatible with existing styles, the browser needs to support the old pseudo-class, such as: First-line,: First-le

in peacetime work with the pseudo-class selector when a colon and two colon seems to be possible, so what is the difference between the two, we first look at the world of the CSS3 selector in the specification of a description:A Pseudo-element is made of both colons (::) followed by the name of the pseudo-element. This :: Notation are introduced by the current document in order to establish a discrimination between pseudo-classes and pseudo-elements.

"points, colons, and self in Lua"In LUA programming, the definition and invocation of functions are often encountered, sometimes called with a dot number, sometimes by colons.Girl = {Money = $] Function girl.gotomarket (girl, Somemoney) Girl.money = Girl.money-somemoney End Girl.gotomarket (g IRL, +) print (Girl.money)The method's point number definition and point number are called.Boy = {Money = $] Function boy:gotomarket (somemoney) Self.money = Sel

This,self,parent Differences and PHP double colons:: Usage

PHP $this,static,final,const,self and double colons in object-oriented classes: These are some of the key words to use.

After reading the JavaScript data types and expressions and operator-related knowledge that you can his experiment a JavaScript pen question, I did not expect to die again and again in commas, colons and parentheses, we have to look at these symbols. nbsp; Comma comma Our common usage is to declare some variables in a row, a lot less var nbsp; nbsp; var a=1, nbsp; nbsp; b=2, nbsp; nbsp; c=3; Method arguments we use commas to separate the object prope

\ t Tabs \b Backspace \f Page break In fact, as seen from the table above, it is not only the metacharacters that need to be displayed to escape (","), but also the case where a specific character can be escaped to another meaning after using a transfer, for example, N--to a newline character.From the learning can follow the following logic to understand the whole JS escape:1. The JS s

In php, double colons are often seen in php Code: operator. this is the scope limitation operator, which is represented by a double colon:. it is used to pin the levels of different scopes in the class. On the left is the access scope member on the right of the scope. The scope defined in php is self and parent (static scope is provided in php6 ). Self: indicates the scope of the current class. Unlike this, it does not indicate the application of doub

A single colon (:) used for CSS3 pseudo-classes, double colons (::) for CSS3 pseudo-elements. A pseudo-element consists of a double colon and a pseudo-element name. Double colons are introduced in the CSS3 specification to differentiate between pseudo-classes and pseudo-elements. But pseudo-classes are compatible with existing styles, and browsers need to support old pseudo-classes at the same time, such as

--Here is the next action to copy to another file after the same file is added ... PackageCom.dragon.java.addtotxt;ImportJava.io.BufferedReader;ImportJava.io.BufferedWriter;ImportJava.io.FileReader;ImportJava.io.FileWriter;Importjava.io.IOException;/** Add line numbers and colons to each line in day19-note. txt*/ Public classTest { Public Static voidMain (String args[]) {//because it is convenient to use BufferedReader to take into account the data of

Single and Double colons in C ++ 1. colon (:) usage(1) represents the definition of the intra-organization bit domain (that is, the variable occupies several bit spaces)Typedef struct _ XXX {Unsigned char A: 4;Unsigned char C;}; XXX(2) The colon following the constructor acts as a segmentation function. It is a class-based method for assigning values to member variables. The initialization list is more suitable for the constant const type of member va

After reading the knowledge about javaScript data types and expressions and operators, I thought I could try a little on the JavaScript pen question. I didn't expect that I once died of commas, colons, and parentheses, let's take a look at these symbols. The common usage of comma is to reduce the number of var a = 1, B = 2, c = 3 when declaring some variables consecutively. We use commas to separate method parameters, object Attributes are also separa

Some of the following uses have never been seen by a considerable number of PHP enthusiasts. What are these things? We often see many strange PHP syntaxes in the templates of wordpress blog programs, such: The code is as follows: Empty For a considerable number of PHP enthusiasts, what are these things? Are those blog developers doing their own PHP-like template languages? None. In fact, these are PHP syntaxes, but they are not commonly used. they are all alternative syntaxes for PHP p

What are the colons, endif, Endwhile, endfor in PHP, endwhileendfor We often see a lot of strange php syntax in the wordpress template of a blog program, such as: The empty For a lot of PHP enthusiasts have never seen Ah, what are these things? Are those blog developers doing their own php-like template language?Non-also, in fact, these are PHP syntax, but not commonly used, these are PHP process control of the alternative syntax.Here we will gi

This, self, parent differences and PHP double colon: usage PHP5 is a language with most of the characteristics of object-oriented languages, with many object-oriented features than PHP4, however, there are some concepts that are also quite confusing, so today I am going to talk about it, but it's not good. please forgive me. (To read this article, you need to understand the object-oriented knowledge of PHP5.) first, we can understand three keywords: this, self, parent. literally, this, self, dif

Double Colon in PHP:: Usage A few days ago in Baidu know inside see someone asked PHP double colon:: The use, at that time to his answer is relatively concise because the phone typing is not convenient! It suddenly comes to mind today, so here's a summary of the double colons I've encountered:: What to use in PHP! one, when static properties and static methods are called :: The same as the role, but the use of different objects! :: Refers to stati