c# constructor initializer

In C #, the static constructor of a class is used for initialization before the class is used. For example, it initializes static members or performs specific operations. The CLR automatically calls the static constructor when it first creates the class object or calls the class static method. At the same time, CLR ensures the thread security of the static

dynamic_cast. The macro definition cannot judge the failure, but dynamic_cast can. If the conversion fails, dynamic_cast returns NULL. If you want to return an exception instead of null, You can encapsulate it as follows: Template Inline target * my_cast (source * s) { Target * temp = dynamic_cast If (temp = NULL) Throw STD: bad_cast (); Return temp; } This is exactly the implementation of Boost: polymorphic_cast. Similarly, you can implement static_cast as follows: Template Inline target my

copy constructor is insufficient:Some cases must be shown to define the copy default constructor, for example:#include #includeusing namespacestd;classbook{ Public: Book (Const Char*name) {BookName=New Char[Strlen (name) +1];//use new to request strlen (name) +1 size spacestrcpy (bookname,name); } ~Book () {delete []bookname; //free space for the request } voidShowName () {cout"bookname="Endl; }Pr

In virtual inheritance, the virtual base class is initialized by the final derived class, in other words, the constructor of the final derived class must call the constructor of the virtual base class. For the final derived class, the virtual base class is the indirect base class, not the direct base class. Unlike normal inheritance, in normal inheritance, a derived class

Look at the code below, what do you think it will output? class Foo 　　{ 　　　　public Foo(string s) 　　　　{ 　　　　　　Console.WriteLine("Foo constructor: {0}", s); 　　　　} 　　　　public void Bar(){} 　　} 　　class Base 　　{ 　　　　readonly Foo baseFoo = new Foo("Base initializer"); 　　　　public Base() 　　　　{ 　　　　　　Console.WriteLine("Base constructor"); 　　　　} 　　} 　　class Derived : Base

Question: for C + + beginners There is an error, if the class does not define any constructors, the compiler will automatically generate the default constructor. NOTE: This statement is wrong. The correct argument is that the compiler will not synthesize the default constructor until the default constructor is "requir

The following is a question about constructor calling in C ++: is the output 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

Default constructor (that is, a constructor without parameters)The Default ConstructorThe default constructor is the constructor used to create a object when you don't provide explicit initialization values. That's, it's the constructor used for declarations like this:Stock

, the constructor must be inherited and implemented in the derived class. It also provides a way to pass parameters to the base class constructor so that the required data can be obtained when the base class is initialized, using the base keyword when implementing the constructor. After you create an object of a derived class, the program first runs the contents

初始化过程B b(0,0);//正确！ When we define a default constructor ourselves, the compiler does not define a composite constructor for us, but the copy constructor is different! Even if we define it ourselves, the compiler will define it again! In general, the function is to copy the members of its parameters one by one into the object being created. That is,

Initialization and assignment do not make much difference to members of built-in types, like any constructor.But sometimes you have to use a constructor with an initialization list :(1) The member type isclasses without a default constructor。 If no explicit initialization is provided, the compiler implicitly uses the default constructor of the member type, and i

C ++ Object Model -- Construction of Default Constructor (chapter 2)Chapter 2 The most common complaint about C ++ In The constructors of Constructor is that The compiler has done too many things on The back of programmers. the Conversion operator is the most commonly referenced example.2.1 Default

I have two misconceptions about the C + + default constructor: If a class does not define any constructors, the compiler (definitely!) will define a composite default constructor for the class. The composite default constructor initializes all the data members in the class. The first misunderstanding comes from the f

C # core Foundation-class constructor,I. Constructor The constructor of a class is a member method of the class. It serves to initialize the members of the class. Class constructor methods include: 1. Static Constructor2. instance Construction Method 1. Static

For ordinary types of objects, replication between them is simple, for example:int a=88;int b=a;And the class object is different from the ordinary object, the internal structure of the class object is more complex and there are various member variables. Let's look at a simple example of a copy of a class object. Copy Code code as follows: #include using namespace Std; Class Cexample {Privateint A;Publiccexample (int b){a=b;}void Show (){cout}}; int main (){Cexample A (10