Why must the parameter of a copy constructor be a reference?

Why must the parameter of a copy constructor be a reference?

It is necessary to pass object as reference and not by value because if you pass it by value its copy is constructed using the copy constructor. This means the copy constructor would call itself to make copy. This process will go on until the compiler runs out of memory.

Can a copy constructor accept an object of the same class as parameter instead of reference of the object?

Answer: No, in C++, a copy constructor doesn’t support pass by value but pass by reference only. It cannot accept object parameter by value and it should always receive it as a reference. An error, “Illegal copy constructor” will be thrown if we receive object by value.

Why reference is used in copy constructor and not pointer?

Passing by references ensures an actual object is passed to the copy constructor, whilst a pointer can have NULL value, and make the constructor fail.

How do I copy a constructor in C#?

C# doesn’t provide a copy constructor. However, we can use a copy constructor along with another constructor. The name of the constructor is the same as its class name.

How many parameters does a copy constructor have?

one parameter
A copy constructor always takes one parameter, reference to the type for which it belongs, there maybe other parameters but they must have default values.

Why do we need const in copy constructor?

When we create our own copy constructor, we pass an object by reference and we generally pass it as a const reference. One reason for passing const reference is, we should use const in C++ wherever possible so that objects are not accidentally modified.

Can copy constructor be pass by value?

Copy constructor itself is a function. So if we pass an argument by value in a copy constructor, a call to the copy constructor would be made to call the copy constructor which becomes a non-terminating chain of calls. Therefore compiler doesn’t allow parameters to be passed by value.

Why do we send the object by reference in copy constructor?

Why do we send object by reference in copy constructor?

Can we have pointer in copy constructor?

The default constructor does only shallow copy. Deep copy is possible only with a user-defined copy constructor. In a user-defined copy constructor, we make sure that pointers (or references) of copied objects point to new memory locations.

What is the purpose of copy constructor in C#?

Copy Constructor creates an object by copying variables from another object.

Can a copy constructor have multiple arguments?

A copy constructor has as its first parameter a (possibly const or volatile) reference to its own class type. It can have more arguments, but the rest must have default values associated with them.