Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++

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What is a copy-constructor in C++ used for?

To copy the values of all variables

To create a new thread

To create a new object as a copy of an existing object

A copy-constructor in C++ is a constructor that initializes a new object using an existing object as a source. This is different from an assignment operator, which only copies the values of the variables. A copy-constructor is used when you want to create a completely new object with its own unique memory space and values, rather than simply referencing an existing object. Creating a new thread (option B) and deleting an object (option D) are unrelated to copy-constructors and are not valid uses for them. Option A is incorrect because it implies that the copy-constructor only copies the values of the variables, whereas it actually creates a new object.

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To delete an object

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