friend class

Declaration format for the class:Class class name identifier {[public:][data member Declaration] [Declaration of member function][private:][data member declaration] [Declaration of member function][protected:][declaration of data member]

# # #指针和引用的区别1. The pointer is a variable that stores the address pointing to the data, and the reference is simply an alias of the original variable, which is essentially the same as the original variable.2. Pointers can be multilevel, reference

Using boost serialization for the time being, my test is basically OK just for c++11 shared ptr not tested successfully, can only manually write down the shared PTR part of the serialization, that is, I do not directly serialize the pointer,

Overview: 1. Why to make Ufida yuan. Usually for ordinary functions, it is impossible to access the protection members of a class, and if you want to do so, you have to make the members of the class public (shared), but the problem with this is

Usually for ordinary functions, it is impossible to access the protection members of a class, and if you want to do so, you have to make the members of the class public (shared), but the problem with this is that any external function can access it

A binary tree can be empty if not empty, the following properties are satisfied (1) All key values of the non-empty left subtree are less than their root node key values (2) All key values of the non-empty right subtree are greater than their root

In some cases, it is convenient to allow specific non-member functions to access private members of a class while still blocking general access. For example, overloaded operators, such as input or output operators, often require access to private

Methods In QT 4.6.x In QT 4.6, the starting point of the class member variable definition method has not changed, but has undergone great changes in the specific implementation methods. In QT 4.6, a lot of macros are used to do things, which

As mentioned in the previous blog post, you can record the access permission here when you think that youyuan can change the access permission. You can use friend to apply for membership requests. Other classes cannot access private members of this

When using object pointers, C ++ often needs to consider the following issues: pointer initialization, object creation, and release. This will undoubtedly increase the burden on programmers. programmers should not only consider the business logic,

1. derive a cdocument class and set the dialog box to the friends of the class, for example: Class cxxdlg; Class cmydocument: Public cdocument{Declare_dyncreate (cmydocument) Friend class cxxdlg;Public:Cmydocument ();Virtual ~ Cmydocument ();#

Oracle has been used in the past two days, and it has been useless for a long time...When I started to use occi for access, the code could be very streamlined, because the occi package is still very good. It is very similar to mysql ++, and I don't

Webrtc packages criticalsection, which can be used in windows and posix platforms. The basic structure is as follows: In the factory method, you are responsible for the creation of specific class objects, which can be called a simple factory model.

1. Brief Introduction First, we need to decide whether to implement the chain table structure or the ordered structure. For the implementation of the ordered structure, when the data is full, we need to open up new Arrays for replication, therefore,

The middle part of this article has already introduced the meaning of virtual reality, that is, indirect acquisition, and examples show that TV channels allow people to indirectly obtain TV station frequencies. Therefore, in this sense, it is

Virtual constructor is not allowed in C ++, if virtual is added before the constructor.Take vc6 as an example. The Compiler reports the following error: 'line' is the only legal storage class for constructors.Although I don't understand the

Http://blog.csdn.net/oowgsoo/article/details/1529284 Qobject of QT 1. TestCode:# Include # Include # Include Int main (INT argc, char * argv []){Qapplication app (argc, argv ); Int size = sizeof (qobject ); Qpushbutton * Quit = new

Refactoring patterns: Part 3 Considerations for applying refactoringShi Yizhen (shiyiying@hotmail.com)Technical Director of Zhejiang University lingfeng Technology Development CompanyDecember 2001 Next to the second part of this article, we will

Original file timesynmanager. h   # Ifndef timesynmanager_h __# Define timesynmanager_h __ Const int max_year = 1100;Const int min_year = 70;Typedef long _ int64; # Include # Include # Include # Include # Include // # Include Typedef/* _

I encountered a small problem when I used the object meta class in combination with the namespace today. Let's summarize it. This scenario: A is a connection class and B is a client class. Different namespaces are defined in different header