When an object of the class is returned by value.

Konstruktor c++. Constructors can be very useful for setting initial values for certain member variables. A constructor resembles an instance method, but it differs from a method in that it has no explicit return type, it is not. Constructors can also take parameters (just like regular functions), which can be useful for setting initial values for attributes.

S() {} // legal c++ }; Struct blocknode { unsigned int bsize; As the other answers mention, a struct is basically treated as a class in c++.

The copy constructor is used to −. For example, class wall { public: It will not touch the data members or plain old data types (aggregates like an array, structures, etc…).

The two main types of constructors are default. Initialize one object from another of the same type. This is the only way to initialize members that require values upon initialization, such as const or reference members, and it can be more performant than assigning values in the body of the constructor.

A constructor will have exact same name as the class and it does not have any return type at all, not even void. In c++, the constructor cannot be virtual, because when a constructor of a class is executed there is no virtual table in the memory, means no virtual pointer defined yet. Copy an object to pass it as an argument to a function.

The compiler will implicitly declare the default constructor if not provided by the programmer, will define it when in need. When an object is constructed based on another object of the same class. // create a constructor wall() { // code } };