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C++ Language > Learn C++ Language > what is copy constructor?
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what is copy constructor?

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The copy constructor is a constructor which creates an object by initializing it with an object of the same class, which has been created previously. The copy constructor is used to: Initialize one object from another of the same type. Copy an object to pass it as an argument to a function.
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copies contents of one object with contents of specified object.
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creates a new object by copying an existing object
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C++, C, Embedded, Linux Expert

Copy constructor is especial member function of the class if user does not declare it into the class then compiler will provide it to the user. Copy constructor creates the new object from the already existed object of same class. Suppose you have a class A then the copy constructor will look like...
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Copy constructor is especial member function of the class if user does not declare it into the class then compiler will provide it to the user. Copy constructor creates the new object from the already existed object of same class. Suppose you have a class A then the copy constructor will look like A(const A& obj). Copy constructor will be called only three situations: call by value, return by value and explicitly called. read less
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Programming in C, C++, Unix

Its a constructor that is invoked when a new object is formed using a copy of existing object. Happens in scenarios like, return an object by value, pass an object by value, passing an object into new(). Writing the syntax, is resulting in an error. But you get the point, right ?
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Copy constructor is a special constructor for creating a new object as a copy of an existing object.
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Software Professional Trainer with 26+ years of Experience in Software Design and Development

The copy constructor is a special kind of constructor. It creates a new object by copying an existing object. If the programmer did not declared the copy constructor for a class, the compiler will add its own default copy constructor for the objects derived from that class. Copy constructor will...
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The copy constructor is a special kind of constructor. It creates a new object by copying an existing object. If the programmer did not declared the copy constructor for a class, the compiler will add its own default copy constructor for the objects derived from that class. Copy constructor will be called based on the following scenarios When make copy of an object. When pass an object as an argument by value to a method. When return an object from a method by value. string obj1("Welcome"); string obj2(obj1); string obj2 = obj1; //the same as above read less
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16 years of IT exp. Overseas (Singapore/Dubai/Spans) 4.5 years exp.

The copy constructor is a special kind of constructor. It creates a new object by copying an existing object.
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C,C++17,Data Structure, Algorithm, STL,Multithreading,Async, Assignments - Online tutor

Hello Hiteshwar, Before answering copy constructor, I will like to discuss a bit more before it. While we are creating an object, the constructor calls to initialize and build that object. If one object already exists for which constructor would be called to create it. Now we want the same object to...
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Hello Hiteshwar,

Before answering copy constructor, I will like to discuss a bit more before it. 

  1. While we are creating an object, the constructor calls to initialize and build that object.
  2. If one object already exists for which constructor would be called to create it.
  3. Now we want the same object to be copied to another object. So we are creating a new object, and during declaration, we are assigning it to an existing object. Here the new object is creating, So definitely constructor will be called, but which constructor?
  4. So to copy the current object to the newly created object C++ lang feature added another particular constructor which is nothing but copy constructor. 

Hope it's clear to you. If any query, let us know!!!

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Company constructor is one technic with the help of you can compare or change values of one object parameters with other object parameters of the class.
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