Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

copy constructor

Posted on 2003-12-09
6
Medium Priority
?
371 Views
Last Modified: 2010-04-17
under what all senario's copy constructor is invoked.hurry up guys
0
Comment
Question by:chikucoder
6 Comments
 
LVL 24

Expert Comment

by:shivsa
ID: 9910257
Copy constructor is invoked when you have to assign an instance of the class to another instance of the class. For example in your case,  a sample of the code would be :

SomeClass A, B;

A.Assign(); // Assuming you have a method Assign which fills this.
B = A;        // Now the copy constructor is invoked
0
 
LVL 24

Expert Comment

by:shivsa
ID: 9910264
Purpose of copy constructor is to make a new object based on an existing object, where both objects belong to the same class.

another example is
SomeClass B( A ) ;
0
 
LVL 1

Author Comment

by:chikucoder
ID: 9910270
how it is different from assignment operator
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 24

Accepted Solution

by:
shivsa earned 200 total points
ID: 9910361
in above example
B = A;  // invoke the assignment operator after invoking the default constructor.

while

SomeClass B( A ) ;  // invoke the copy constructor
queueClass y = x ;  // invoke the copy too.
-------------------------
0
 

Expert Comment

by:smallbug005
ID: 9910520
1. At the time of object creation
2.At datatype casting time
3. At = assignment operator invokation
0
 
LVL 3

Expert Comment

by:monkesdb
ID: 9910634
1) MyObject a(myObjectInst);
2) MyObject a = myObjectInst;
3) a = (MyObject)myObjectInst;       // if a has been initialised it will call the copy ctor then the assignment op...
                                                    // if not then it will call the copy ctor twice,
                                                         // once for the cast and once for the initialisation of a.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
Simple Linear Regression

824 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question