virtual constructors and destructors

Problem:Does the class require an argument-free constructor?Does a class need a destructor?Does the constructor of a class need to initialize all object members?Does the class require a virtual destructor?Some classes require virtual destructors

FAQQ1. what is the output of the following code? 1#include 2 using namespacestd;3 4 classA5 {6 Public: 7A () {cout "A"Endl;}8~a () {cout "~a"Endl;}9 }; Ten classD | PublicA One { A Public: -B (a &a): _a (a) {cout "B"Endl;} -~b () {cout "~b"Endl;

turn from: http://blog.csdn.net/chen825919148/article/details/8020550 constructors cannot be declared as virtual functions, destructors can be declared as virtual functions, and sometimes they must be declared as virtual functions.It is not

1. Do not call virtual functions in constructorsConceptually, the work of a constructor is to initialize an object. The constructed object is considered "not fully generated" until the constructor is complete. When an object of a derived class is

http://blog.csdn.net/xw13106209/article/details/68993701. ReferencesReference 1:c++ constructor, destructor call order and dynamic binding of virtual function in inheritanceReference 2: Invocation time and sequence of calls for constructors, copy

when we beginner C + +, we may have some doubts about the constructor of the class, the copy constructor, and the destructor. Organize the following (personal opinion, if there is a mistake, also look at it.) ):1. ConstructorsAccording to the

Original: http://blog.csdn.net/xhz1234/article/details/6510568C + +: Can constructors and destructors be virtual functions?The simple answer is that the constructor cannot be a virtual function, and the destructor can and often is a virtual

Item 09-Never invoke virtual functions in constructors and destructors (never call virtual functions during construction or destruction)Why?Since the base class constructor executes earlier than the derived class constructor, the member variables of

calling virtual functions inside a constructor Calling a virtual function in a normal member function still resolves a virtual function call at run time because the object does not know that it is a class or a derived class that belongs to the

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