CPP Copy Constructor with Example | C++ Programming Video Tutorial | Summary and Q&A

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January 22, 2014
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CPP Copy Constructor with Example | C++ Programming Video Tutorial

TL;DR

This tutorial explains what copy constructors are, why they are used, and how to implement them in C++.

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Questions & Answers

Q: What is a copy constructor in C++?

A copy constructor in C++ is an overloaded constructor that is used to create a copy of an object when it is being assigned or passed as a parameter.

Q: Why are copy constructors used in C++?

Copy constructors are used to ensure that each object has its own memory space and values, preventing unintended changes when modifying one object from affecting another.

Q: What happens if a copy constructor is not defined in C++?

If a copy constructor is not defined, a default copy constructor is called, which performs a bit-by-bit copy of the object. This can lead to issues when using dynamic memory allocation and can result in unexpected behavior.

Q: When is a copy constructor called in C++?

A copy constructor is called when objects are being assigned (using an equal to operator) or when objects are passed as parameters to functions.

Q: How is a copy constructor implemented in C++?

A copy constructor is implemented as an overloaded constructor with the same name as the class, taking an object of the same class type by reference. Inside the copy constructor, the necessary allocations and value assignments are performed to create a separate copy of the object.

Q: What is the purpose of the copy constructor?

The purpose of the copy constructor is to ensure that each object has its own memory space and values, independent of other objects. This allows for safe copying and modification of objects without affecting the original or other copies.

Q: What is the difference between a copy constructor and a default constructor in C++?

A copy constructor is used to create a copy of an existing object, while a default constructor is used to initialize a new object with default values. The copy constructor is called when objects are being copied or assigned, while the default constructor is called when objects are being created without specific initialization values.

Summary & Key Takeaways

  • A copy constructor is an overloaded constructor in C++ that is used to create a copy of an object.

  • Copy constructors are necessary when copying objects to prevent the sharing of memory locations and ensure each object has its own values.

  • Without a copy constructor, bit-by-bit copying occurs, leading to unexpected behavior when using dynamic memory allocation.

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