friend class

The Singleton mode is one of the common design patterns, but it is not easy to implement a practical design pattern.Standard Implementation1 class Singleton2 {3 public:4 static Singleton * Instance ()5 {6 if (0 = _ instance)7 {8 _ instance = new

QT introduces the concept of D-pointers in order to maximize binary compatibility for its dynamic libraries. So why is the D pointer binary compatible? To answer this question, first figure out what binary compatibility is? The so-called binary

The expansion of a class (bloating) refers to the presence of too many members in a class, or even an increase in disorder. Too large a class, will make the complexity of the rapid increase, maintenance will become more difficult. So we need to

C language Evolution to C + + process, is a camouflage of the development process.1, BOOL type variable: 1 byte variable (same size as char), default assignment is True (1), False (0)2, reference variable: The new application of the variable to hang

1. Concept of the Inner classIf a class is defined inside another class, this inner class is called an inner class. Note at this point that the inner class is a separate class, it is not an external class, and it is not possible to invoke an inner

? Use of FriendsDivided into friend and friend functions BlankTest.cpp: Defines the entry point of the console application. // The common denominator of friend and friend functions: You can have one class as a parameter of another class or

First, this pointer 1. C + + program to C program translation Class Ccar { struct Ccar {public : int price; int price; }; void Setprice (int p);

When compiling an MFC application, I often encounter the problem that header files contain each other. So I turned to the powerful csdn and got the following answer:   Method 1: Use the youyuan class I have two classes in total. Because I want to

Main content:1. Scope and visibility2. Lifetime of an object3. Data and Functions4. Static members5. Protection of shared data6. Friends7. Compiling pre-processing commands8. Multi-file structure and engineering Scope: Function prototype scope,

*sharing and protection of data:*1. Scope:* Scope is an identifier in the program body that is valid in the area. C++The scope of identifiers in a function is prototype scope, local scope (block scope), class scope, and namespace scope. * (1).

The shorthand for the Dimitri rule is LoD, and the one in the middle is lowercase. Dimitri Law is also called to do the least knowledge principle (Least knowledge Principle, abbreviation LKP) said is a thing, an object should have the least

  Method 1: I have two classes using the youyuan class. Because I want to apply each other in the header files of the two classes, the header files of the other class are included in the header files of each class, then, declare another class as a

Here are some of the key points that apply to all C + + program apes. I say they are the most important, because these points are mentioned in the C + + book or you usually can not find the site. For example, pointers to members, which are not

The invocation of a friend function in C + + is generally divided into three ways:1, the General friend function2, Class A as a friend of Class B, then the member function of Class A is a friend function of Class B.3. A member function of a class as

CIn ++, youyuan includes youyuan functions and youyuan classes. Youyuan functions are already known in the usage of classes in the previous chapter. Now we mainly discuss youyuan functions. 1.Youyuan class: Previously, we used the youyuan

Youyuan interface-Limit the number of your friends   Write c ++ProgramYou may have encountered the following situation:There is a set of policies in a class, and the implementation of these policies needs to be accessedAAnd these Members do not

An event system is a core component of software. From an elementary point of view, it is the design mode for interaction between modules in an application. From a general point of view, it is a component module of the software architecture. In

As far as language is concerned, individuals prefer C + +, although some of the grammatical aspects of C + + are quite esoteric, but these do not block the place where it is irreplaceable in practical applications.Start talking about today's focus,

I have been familiar with vs2015 tools to edit C + + in the past few days, (formerly used are vc++6.0). The discovery is really not easy to use, a simple small program will error a lot of questions you can not understand. I present to you the

1.1 Start support for macros _STDC_ and _FUNC_Have to spit groove, g++ long support these two macros, the first macro _stdc_ also have a few derivative macros, used to control the version; _func_ use the return function name in the function