const static

  The original http://blog.csdn.net/jenghau/archive/2009/10/31/4752735.aspx from the link, but there are many problems in the middle, after my correction.1. Common variables: assign values in constructors without considering the efficiency.

  1. Why should I add the extern "C" to call the function compiled by the C compiler in the C ++ program "?A: First, extern is a keyword in the C/C ++ language that indicates the range of the function and global variable. This keyword tells the

? Memory leaksIn the process of testing the decision-making procedure, we found a strange problem, each time the program is opened, the connection cable to the dsbase to send data, there will be a 4k of memory leakage every time, 1s

Today is a good day. Everything you want can be done. Tomorrow is a good day.... Well, it's so enjoyable to listen to songs and write documents. Today, my neighbors suddenly liked me on qq,This made me very excited... This should be mentioned a few

Glblendfunc defines the pixel algorithm.void WINAPI glblendfunc (glenum sfactor,glenum dfactor);parameter editing Sfactor specifies how the red-green-blue and alpha-source blending factors are calculated. The initial value is Gl_one. Nine symbolic

It's not hard to implement a simple Web server under Linux. One of the simplest HTTP servers is simply an advanced file server that receives HTTP requests from the client (browser), parses the request, processes the request, and then sends back the

1.QT Custom title bar, drag the title bar to move the window (only drag the title, other positions cannot be dragged)Method One:Reprint: http://blog.sina.com.cn/s/blog_4ba5b45e0102e83h.htmlThe. h file1 //re-implement the drag operation yourself2

The usual: Record the details, wait for the spare, and then organize.1:const,static,const static member initialization.1. Const member: can only be initialized in the initialization list after the constructor2. Static member: Initialization is

First the static variable is initialized only once, both in the class and in the function: There is such a function:1 void Foo () 2 { 3 staticint a=3// Initialize 4 std::cout A; 5 a++; 6 } The static int a=3 is executed only

ObjectiveUnderstanding C + + Program memory allocations helps to understand the initialization values of variables and their lifetime. In addition, the variable type modifier also affects the initialization value of the variable and its life cycle.

Overview:The source code of the C preprocessor handler, which runs before the compiler, usually begins with the symbol #.Also involves static, const knowledge points ... Some are similar to Java ... Some easily confuse t.t.Many of the chapters in

Implementation of C ++ Singleton in asp.net Solution 1 The Code is as follows:   Class QMManager{Public:Static QMManager & instance (){Static QMManager instance _;Return instance _;}} This is the simplest version.

The static members of a class are different from ordinary members, and they have their own characteristics, and I'll take the following classes as an example. Design bank account class Account#include #include class

Solution 1 The code is as follows:Copy code Class QMManager{Public:Static QMManager & instance ()    {Static QMManager instance _;Return instance _;    }} This is the simplest version. There is no problem in a single thread (or C ++ 0X), but it

Static class member usage  # Include using namespace STD; class base {public: Base (int I): B (I) {} static int get_a () {return a;} PRIVATE: int B; static int A; // static const int A = 5 ;}; int base: A = 5; // int base: B = 6; // errorint main ()

There are several search algorithms: Enumeration algorithm: That is, to list all the statuses of the problem and find a solution that meets the problem. It is suitable for problems with few States and relatively simple. Extended

Functions are available everywhere. A small program has one or two functions, and a large program has hundreds of functions. Even in the key loop of the game, it is common to call dozens of functions. Therefore, the quality of function call code

MFC single document view (conversion) MFC single document/View Structure Directory Chapter 1 retrieve winmain function 2Chapter 2 initapplication () function 2Chapter 3 initinstance () function 3Section 1: New csingledoctemplate 3Section 2:

I. What is a static class memberAccess to a global object is sometimes necessary for all objects of a particular class type. The global object then destroys encapsulation: the object needs to support the implementation of a particular class

The role of Static 　　　1. HideWhen we compile multiple files, all global variables and functions that do not have a static prefix are globally visible and other source files can be accessed. For example, we have the source file Source1.cpp