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C++/copy constructor

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Question
why do we required to pass a reference to copy constructor?

Answer
Srini , Thank you for your question.

The purpose of a copy constructor is to make a copy of a given class instance, specified by a reference to it.

If the class instance were specified directly, the compiler would attempt to make a copy of the given class instance. But that makes no sense, because it is precisely that copy constructor that is being defined.

David Spector

C++

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David Spector

Expertise

Highly knowledgeable in the C++ language, Visual C++ (MSVC), Windows API, documentation and other quality-assurance techniques, and debugging. Knowledgeable in MFC, COM, GUI design, and object-oriented design.

Experience

I have been a software engineer since 1965. I have been published. My specializations have been: biomedical programming, compiler implementation, and many kinds of Windows programming. I don't do Databases or other business-oriented stuff.

Publications
Windows?/DOS Developer's Journal, ACM SIGPLAN Notices, and Computer Science Press.

Education/Credentials
ICCP Systems Programming Certification
Master's degree equivalent in Computer Science

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