What is a "Copy Constructor"?
Answers were Sorted based on User's Feedback
Answer / phool chand
A Copy Constructor constructs a new object as a copy of an existing object of the same type. Frequently copy constructors do a 'deep copy' of the object. X( const X& X_object ){...}; is a copy constructor for class X.
Deep Copy vs. Shallow Copy:
a shallow copy simply copies the contents of an object directly - if the object contains pointers, both the old copy and the new copy contain pointers to the same actual item. In a deep copy, when an object contains a pointer, a new copy of whatever the pointer points AT is created and the new object contains a pointer to the newly created copy of the item.
Why are deep copies important? If you carry out a shallow copy you end up with two pointers to the same item. If that item is an object with a destructor, this generally means you'll end up calling the destructor for that item twice, which will generally cause problems.
Unfortunately, most don't know to ask this question directly: the symptom is generally heap corruption which is hard to track down directly since there it has many possible causes.
Is This Answer Correct ? | 0 Yes | 0 No |
In the C++ programming language, a copy constructor is a special constructor for creating a new object as a copy of an existing object.
Is This Answer Correct ? | 0 Yes | 0 No |
What does n mean in c++?
Write syntax to define friend functions in C++.
Which field is used in c++?
I need to find a specific string between two strings how do I do it?
How should a contructor handle a failure?
what is importance of data sturture in a programming language?
22 Answers L&T, TCS, Wipro,
What is scope in c++ with example?
What are the two types of comments?
Explain the static storage classes in c++.
What is a float in c++?
Implement strcmp
Describe private, protected and public – the differences and give examples.