Virtual base class mainly solves in multiple inheritance, the base class may be inherited multiple times, the virtual base class mainly provides a base class to the derived class, such as: #include using namespace std;
Class base//is declared as
C + + notes: Derived classes to base class conversions to accessibility
to determine whether a conversion to a base class is accessible, you can consider whether the public member of the base class is accessible and, if so, that the conversion is
Henry's VB. NET journey (7)-vulnerable base class
Han Rui
"Since it is fragile, it means it is as vulnerable as an eggshell. This problem is actually very understandable. The program is always designed and written by people, so it is normal
The following blog reproduced from others, I was also the problem of the pit for almost two days, about a variety of virtual base classes, virtual inheritance, virtual functions and data members, such as a series of memory-alignment issues again
Declare the destructor of the polymorphism base class as a virtual function.
Now we want to consider a timer problem. First we create a base class named timekeeper, and then create various derived classes based on it, so that we can use different
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
Clause 07 declares virtual destructor for the polymorphism base class, And the polymorphism virtualDeclare virtual destructor for the polymorphism base class
In the inheritance for Polymorphism purposes, if the virtual destructor is not declared for
Turn from: http://baiy.cn/doc/cpp/inside_rtti.htm
"Using the right features in the correct situation" is a basic standard for competent C + + programmers. To do this, you first need to understand how each feature in the language is implemented and
Derived classes in C + + have the following two types of access to base class Members:1. Internal access: accessed by a member of a derived class that is inherited by a new member of the base class.2. Object access: Outside the derived class, access
A derived class often (but not always) overrides its inherited virtual functions. If a derived class does not overwrite a virtual function in its base class, the virtual function behaves like other ordinary members, and the derived class directly
The general form of declaring a virtual base class is:
ClassDerived class name:VirtualInheritance Method Base Class Name
After such declaration, when the base class is inherited by a derived class through multiple derived paths, the derived
The fourth edition of the C++primer 15.3.1 section mentions the feasibility of a base class-to-derived class conversion (whether Ref/poniter or not), some of which are awkward and, according to the English version, get the following points:1. In the
In C + +, subclasses inherit the parent class in three ways: public, protected, and private. Subclass inherits in different ways, the child class object accesses the parameter access permissions in the parent class differently.Public mode
Inheritance and derivation of classesObject-oriented technology emphasizes the reusability of software, which is realized through inheritance mechanism. In the process of inheriting classes, the original class being reused is called the base class,
In Oo, the base class has two methods at most. The first method is interface, that is, the base class is abstract class. The most typical example is factory design pattern. the second approach is to provide a mechanism for base class, and then
recently wrote the program found that the base class function of a derived class object if the base class virtual function is called, it will call the corresponding function of the derived class, not the corresponding function of the base class I
1. Reasons:
When implementing polymorphism, when using a base class pointer to manipulate a derived class, prevent only the destructor of the base class without the destructor of the derived class at the time of the destructor.
2. Example:
(1),
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
Source: http://www.cppblog.com/woaidongmao/archive/2010/07/01/119024.html
In C ++, a derived class can access base class members in the following two forms:1. Internal access: Access to members inherited from the base class by new members in the
Derived class to base class:When calling a function:The object of the derived class is passed to the function to be referenced by the base class. At this time, the type conversion from the derived class to the base class does not occur. Because the
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