virtual constructor

The following is a question: Is the printing result of the following code 0?# Include # Include Using namespace STD; Struct CLS{Int m_ I;CLS (int I): m_ I (I ){}CLS (){CLS (0 );}};Int main (){Cls obj;Cout System ("pause ");Return 0;} The printed results are not necessarily set to 0. The strange thing about the code is that the constructor calls another constructor of its own. We know that when defining an

C ++ learning constructor and copy constructor, learning copy constructor Extended Question 1: whether the const parameter is added to the copy constructor affects the copy constructor. Most people on the internet can only explain this problem to the extent that "when you d

Constructor, custom constructor, and custom Constructor //// Main. m # import //// Iphone. h # import Copyright Disclaimer: This article is an original article by the blogger and cannot be reproduced without the permission of the blogger.

Error: Implicit super constructor People () is undefined for default constructor. Must define an explicit constructor, explicitconstructor When a subclass inherits the parent class, if the parent class does not define a constructor with parameters, the subclass can inherit the default

Next, we will modify the animal class constructor and add two parameters, height and weight, to indicate the height and weight of the animals respectively. The code is shown in example 2-13.Example 2-13# Include Class animal{Public:Animal (INT height, int weight){Cout }~ Animal (){Cout }Void eat (){Cout }Void sleep (){Cout }Void breathe (){Cout }};Class fish: Public animal{Public:Fish (){Cout }~ Fish (){Cout }};Void main (){Fish FH;} When we compile t

Class Object and call its constructor dopey. dopey: dopey (); Sneezy. sneezy: Sneezy (1024); bashful. bashful: bashful (); // The following is the user's code mumble = 2048 ;} Conclusion: There are four situations that will lead to the synthesis of a default constructor "class with no life constructor. In other cases, the default

When a subclass inherits the parent class, if the parent class does not have a constructor that defines the parameter, the subclass can inherit the default constructor of the parent classWhen a constructed method with parameters is defined in the parent class, the subclass must explicitly call the parent class's constructor methodIf, at this point, the subclass a

How does a subclass copy constructor call a copy constructor of its parent class and a copy constructor call?Class base {Public:Base (int initialvalue = 0): x (initialvalue ){}Base (const base rhs): x (rhs. x ){}Private:Int x;};Class derived: public base {Public:Derived (int initialvalue): Base (initialvalue), y (initialvalue ){}Derived (const derived rhs) // i

reference types, null is assigned) If we explicitly write any Constructor (whether input or not ),C # will not create the constructor without parameters for us anymore.. Constructors cannot be inherited. Abstract, virtual, new, sealed, and override cannot be added before the constructor. Constructors are methods, so t

then synthesize a copy constructor for the class; 2 If a class does not have a copy constructor, but the class inherits from the base class containing the copy constructor, the compiler then synthesizes a copy constructor for the class; 3 If a class does not have a copy construc