class not defined

A static member of a class, which is shared by all objects, is allocated at the start of the process, and is then fixed without allocating space. The difference between a static member variable of a class and a global variable outside the class is

This technical article is not a discussion of the classical MFC of the message working mechanism, the discussion of how the message works, ways and paths are everywhere in the Internet and books. Many of the discussions on the web are about how to

Sometimes, because the class is too large, it needs to be defined later in the class; For example: Class Y {void f (X) ;}; class X {// some member data and functions }; // ErrorBecause c ++ requires that any variable must be declared before

The Java ClassLoader is mainly divided into the following types: The class loader provided by the JVM Root ClassLoader: The underlying implementation that primarily loads the Java Core Class library (for example:

The final conclusion: defining constants in both interface and class is actually OK, the key is to look at your design and personal interests.In Java, the variables defined in interface are "public static final" types, which are constants, so many

We know the code for getting the class name of a JavaScript user-defined class, although JavaScript is an object-based language. However, with its prototype feature, we can fully implement a very sexy OO compiling framework. Here we can look at the

I have been using js to write self-built object-oriented methods. One problem is to define a method as follows:Copy codeThe Code is as follows:Function ListCommon2 (first, second, third){This. First = function (){Alert ("first do" + first

Premise:1: Each destructor clears only its own members (the member function has no virtual).2: A pointer to a derived class may be the object of the base class, and when the destructor of a base class pointer to a member of a derived class is not

First, all classes that can respond to messages must be derived from the csf-target class, because only the classes provide the message framework and processing mechanism, and the cwnd class also derives from this class. The cwinapp, cdocument, and

The advantage of the Objective-c language is that we are more flexible when writing code, such as we can forward the message to the object we want, or swap the implementation of a method at random. This feature means that objective-c requires not