class destructor

1. destructor and virtual destructorIf the destructor of the base class is virtual, The destructor of its derived class are virtual.This will cause: When the derived class destructor, all of its basic class destructor will be called.Otherwise, only

I. instance Initialization Instance Initialization is the process of preparing a class, structure, or enumeration instance for use. Initialization includes setting each storage attribute of an instance as an initial value, and executing any other

Transformations and inheritanceThis section mainly needs to distinguish between: Conversion of base classes and derived classes; Conversions of references (pointers) and conversions of objects. 1. Each derived class object includes

1: Both the parent class and the subclass have constructors and destructors, and are the subclass objects constructed first by the parent when they are created or by subclasses? Similarly, when the subclass object is disposed, is the parent class

1 overloads of functions, overrides (redefinition), function overrides, and shadowingIn fact, function overloading and function rewriting, function overlay and function hiding are not a level concept. The former is the relationship between functions

Data Abstraction : refers to the ability to define data and function members;Encapsulation : refers to the ability to protect class members from regular access.interface : The member function defines the interface of the class. Encapsulates a class

15th. Object-Oriented Programming OOP (Object-oriented programming)Object-oriented programming is based on three basic concepts: Data Abstraction , inheritance , and dynamic binding 。 In C + +, you use classes for data abstraction, and class

1 //Study of Virtual destructor function2 //If an external program uses the new operator to define a dynamic object, the delete operator is used to delete the dynamic object when the external program ends.3 //However, if the external program takes

1. When defining an object with a class, the C + + compiler compiles a one-dimensional virtual function table for each object (the virtual table, for short). This virtual function table stores the function entry address of the virtual function in

C + + clearly states: when the derived class object is deleted by a base class pointer, and the base class takes a non-virtual destructor, the result is undefined-- The actual execution usually occurs when the derived component of the object is not

I. The assignment compatibility principle in inheritance1. A subclass object can be used as a parent class object2. Subclass objects can be assigned directly to the parent class object3. Subclass object can initialize parent class object directly4.

Abstract class, a class that contains pure virtual functions, is not allowed to create objects.However, sometimes we don't need a function defined as a pure virtual function, but we still want this class to be like an abstract class, not to create

PHP and XML: Using the Expat function (ii) Let's take a look at the PHP code that actually handles this document. /*newsboy:news system for the web written in PHP by Justin Grant (Web:jusgrant.cjb.net or Justin.host.za.net mail:just

Each derived class object consists of a (non-static) member defined in the derived class, plus one or more base class child objects, so that when the derived type object is constructed, copied, assigned, and revoked, the base class child objects are

The semantics of execution, that is, when a program executes, the compiler produces an instruction call that guarantees the construction of the object, the release of the memory, and the security of the type conversion and the generation of the

Standard C + + class std::string memory sharing and Copy-on-write technology Chenhao 1. ConceptScott Meyers in "more effective C + +" an example, I wonder if you still remember? When you were still at school, your parents asked you not to watch TV,

In the study of C + +, the template class is adopted, and the virtual function is used to realize the polymorphism and achieve the general purpose. The Node class data field is transformed into a pointer, and the data is placed in an abstract class,

[Switch] the difference between using managed and unmanaged resources in C # And how to manually release unmanaged resources :, Managed resources refer to. NET resources that can be automatically recycled, mainly the memory resources allocated on

Overview:Well-designed class types can be as easy to use as built-in types 0.0This part will be more boring, are some basic concept understanding t.t　　8.1 Access designatorClass has the following two types of access to its members:1) Internal access:

LeeLin blog (1) When the base class does not have its own constructor, the default bar of the derived class uses the constructor of the base class.(2) When the base class has a self-compiled constructor, you must add a constructor without parameters