Copy constructors in C++: Syntax and Examples

Copy constructor is used by the compiler to bypass bitwise copy when one object initializes another. A copy constructor can have additional parameters but first parameter must be a reference to object.


classname (const classname &r) {


Here, r is the reference to the object.

A copy constructor is applied only to initialization. An initialization can happen in a declaration, when copy of object is passed to function and in generation of a temporary object.

For Example:

myclass a = b;


b = fun();

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