Interested to Buy Any Domain ? << Click Here >> for more details...
What is a "Copy Constructor"?
- 2 Answers
- 1992 Views
- I also Faced
- E-Mail Answers
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 is a singleton class c++?
Write a Program for read a line from file from location N1 to N2 using command line arguments. Eg:exe 10 20 a.c
what is the emaning of '#include" "'?
What are the advantages of using pointers in a program?
Which compiler does turbo c++ use?
What compiler was used?
What is rtti in c++?
Arrange Doubly linked list in the ascending order of its integral value and replace integer 5 with 7?
By using c++ with an example describe linked list?
How can you quickly find the number of elements stored in a static array?
Write a corrected statement in c++ so that the statement will work properly. if (4 < x < 11) y=2*x;
Give 2 examples of a code optimization?
STL 
