friend class

Ceph source code analysis: Network Module Because Ceph has a long history, the network does not use the epoll model that is currently commonly used, but uses a multi-threaded model similar to MySQL. Each connection (socket) has a read thread, read

In Java, we know that there are default package visibility access levels in addition to public and private,protected, though, many times for reasons of early design flaws, we need to access some packages or protected the visibility level. This time

Low -level architecture: relationships between ClassesCombination, inheritance, dependency, aggregation.High-level architecture: Design PatternsComplex design patterns evolve with simple design patterns, solving problems that can not be solved by

CcobjectCCObject.h:#ifndef __ccobject_h__#define __ccobject_h__#include "platform/ccplatformmacros.h"//cocos2d namespace ns_cc_begin// Declares the following kinds of pointers to the member variables of the corresponding class, which are later

1. Test code:#include #include #include int main (int argc, char *argv[]){Qapplication app (argc, argv);int size = sizeof (qobject);qpushbutton* quit = new Qpushbutton ("Quit");Delete quit;return App.exec ();}Qobject is the only base class of the QT

This is a classic article that comprehensively introduces Unit testing. It is very helpful for understanding Unit testing and Visual Unit. The author has made a few changes during the recording. Unit 1 test OverviewThe factory tests each component

Basic Concepts 1. Classes are data types and promote the concept of structure. 2. Declaration Syntax: class name; 3. Definition Syntax: Class name { Private: member declaration | definition; Public: member declaration | definition; Protected: member

Document directory Friend Functions Friend classes Friend Functions In principle, private and protected members of a class cannot be accessed from outside the same class in which they are declared. However, this rule does not

Problem No one wants to make mistakes, but no one can make mistakes. A mistake can only be corrected, but it is difficult to correct (recover ). There is no regret in the world, but we have to give users the right to regret when designing software

BCG is a very good interface library, the best choice for the traditional interface of MFC. Most of his controls are quite good, but in some details, it seems that xtremetoolkit is a little better, such as the color selection button, directory

Java and C # both have the garbage collection function. After a piece of memory is allocated, the programmer can ignore it, but the garbage collection function automatically recycles it, freeing the programmer from complicated memory management.

This topic is derived from an interview question. I have checked many explanations on the Internet! I sorted it out myself and chose a solution that I thought was the best!Let's start from the simplest:First, we all know that to prevent the class

The following analysis is based on:   Developer platform: s60 3rd edition, Feature Pack 2 SDK Operating System: Symbian OS v9.3 I. Why use the client/server architecture? All asynchronous services in symibian OS are implemented by the

In 2-3 trees, each internal node (non-leaf node) has two or three children, and all the leaves are on the same level. For example, figure 1 shows 2-3 trees with a height of 3. The nodes that contain two children are called 2-nodes, and the nodes in

Statement: The technology environment described in this article: QT 4.4.0 open source edition on Linux ThisAll the code in this article is just an exemplary code, just to illustrate the technology itself, so only the most basic code snippets are

The encapsulation of the C ++ thread lock mainly provides operations such as lock, unlock, and require. Note that the thread repeatedly acquires the lock and sets a count counter, this calculator does not consider the atomic operations of ++ and --

C ++ _ 01 _ getting started, _ 01 getting startedI. Class Definition Person. h class declarationPerson. cpp class implementationMain. cpp main FunctionIi. namespace usage Xcode format code: ctrl + IMain function: Iii. class inheritance parent class

C ++ Primer study note _ 21 _ class and data abstraction (7) _ youyuan function and youyuan class, _ 21 yuan class C ++ Primer study note _ 21 _ class and data abstraction (7) _ youyuan function and youyuan class I. youyuan 1. youyuan

Smart pointer in Android     1. Design of smart pointersA very important difference between Java and C ++ is that Java does not have the pointer concept, but does not. Pointers are used internally to hide them, packaging, so that developers do not

There are many implementation methods for smart pointers. auto_ptr is a relatively poor implementation and does not use reference counting. Therefore, there are many problems. In general, the reference counting smart pointer copies the member