default constructor

> When compiler automatically generates default constructor Speaking of the default constructor in C ++, Let's see when the default constructor will be generated. 1. A class member has a member as a class object, and the member's class contains

The first type is that the class member has a member as a class object and the member's class contains the default constructor. Then, the C ++ compiler will help you generate a default constructor for this class, it is used to call the constructor

Reference documents:1. Huang Bongyong Handsome2.http://www.cnblogs.com/graphics/archive/2012/10/02/2710340.html3.http://blog.csdn.net/pnhuangyu/article/details/12352073Divided into three parts:First, the basicSecond, when to need the default

Definition: The constructor used to create an object when an explicit initial value is not provided.Example:Class TestClass{Privateint m_a;int m_b;PublicTestClass (); Default constructor 1TestClass (int a,int b); constructor functionTestClass (int a=

1, each class must have a constructor, otherwise cannot create object; 2. If Programer does not provide any constructors, C + + provides a default constructor, which is an parameterless constructor that is responsible only for creating objects and

Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ 1. What is the default constructor? A function is the default constructor.When and only whenYou can call it without passing in any parameters. This function can be customized or generated by the

Recently in the study of the "Insight C + + object Model", see the second chapter of the structural function part, deep feelings, so write down, convenient for everyone. Of course, it is also convenient for me, lest I forget.1 class test{2public:3

This is a very good book. We recommend you read it. Of course, the book is not necessarily true. Readers need to think and understand it on their own.   This article records some of my views.   Clause 1: differentiate pointers and references.   Of

let's look at a "strange" error first: #include#includeusing namespacestd;classa{Private: intsad; Public: voidF ()Const; voidF1 (); //A (int); //A ();};voidA::f ()Const{cout"Dfsdfds"; } voida::f1 () {cout"F1"; }//a::a (int sr) {//}//a::a () {}

C # Does the compiler generate a default constructor for the value type? The answer is no. the C # compiler does not generate Default constructors for values. This design is based on performance considerations, another reason is that the value

The C ++ compiler combines the conditions of the default constructor (the default copy constructor is the same), and the constructor copies the constructor. When a user does not define a constructor for a class, the compiler does not combine each

When a user does not define a constructor for a class, the compiler does not have a default constructor for each class, and only synthesizes the default constructor when the compiler requires it. The compiler synthesizes the default constructors

    After reading the "inside c ++ object model", I will verify it by myself. I still remember the C ++ textbooks published by Tsinghua University Press in my sophomore year. It took me two weeks to finish reading them. At that time, I didn't have

Note: If the user does not have a constructor defined in the class, the system automatically provides a default constructor that is empty for the function body.However, as long as a constructor is defined in the class (not necessarily a

　　The compiler does not always automatically generate a default constructor for us when the class does not display a declaration constructor, and the compiler will automatically generate a default constructor for us in the following 4 cases:1. In a

There are four cases (1. member Class Object with default constructor; 2. base class with default constructor; 3. class with a virtual function; 4. A class with a virtual base class) causes "the compiler must synthesize a default constructor for a

noun explanation1. Default constructor: Constructor for class no parameter or parameter default value is collectively referred to as the default constructor.2. Initialization list: Unlike other functions, constructors can have initialization lists

[Javase Study Notes]-7.1 constructor overview and default constructor In this section, we will learn a special function, that is, constructor. So what is a constructor? Since it is a function, it should be defined in the class with a function name.

Let's first look at a "strange" error: # Include # Include Using namespace STD; Class { PRIVATE:  Int sad;   Public:   Void F () const;                 Void F1 ();   // A (INT );   // (); }; Void A: F () const { Cout        }  Void A: F1 (){ Cout  

Instances of structs and classes call a special Init method, called a constructor, during construction. The constructor does not have a return value and can be overloaded. In the case of multiple constructor overloads, the runtime can invoke the