Can someone enlighten me on Deep Copy Problem?

Please support our C++ advertiser: Intel Parallel Studio Home
Reply

•
•
Join Date: Jul 2008
Posts: 25
Reputation: Niner710 is an unknown quantity at this point 
Solved Threads: 0
Niner710 Niner710 is offline Offline
Light Poster

Can someone enlighten me on Deep Copy Problem?

 
0
  #1
Nov 6th, 2009
I have an function in which I want to make a copy of an object.

C++ Syntax (Toggle Plain Text) 
  1. ClassBase
  2. {
  3. public:
  4. Tblk myTblk;
  5. private:
  6.  
  7. };
  8.  
  9. void ClassBase::CopyObject(const ClassBase &test)
  10. {
  11.        TblkPtr_t myTblk = TblkPtr_t(new Tblk); //TblkPtr_t is a typedef shared pointer
  12.       *myTblk = *test.myTblk;
  13. }

For some reason that doesn't work. If I use the copy constructor like this

C++ Syntax (Toggle Plain Text) 
  1. myTblk = new Tblk(*test.myTblk)

then it seems to work. I don't understand why if I dereference the pointer in my original example why it wouldn't work. Can someone enlighten me?
Reply With Quote Quick reply to this message  
•
•
Join Date: Dec 2008
Posts: 1,444
Reputation: firstPerson is just really nice firstPerson is just really nice firstPerson is just really nice firstPerson is just really nice firstPerson is just really nice 
Solved Threads: 187
firstPerson's Avatar
firstPerson firstPerson is online now Online
Nearly a Posting Virtuoso
 
0
  #2
Nov 6th, 2009
Your copy ctor is hiding the member variable. And even worse you have
a memory leak. 
1) Prove that the area of a circle is pi*r^2, where "r" is the radius of the circle.
2) Problem 2[b]solved by : jonsca
Reply With Quote Quick reply to this message  
Reply

Quick Reply to Thread
•
•
•
•
•
•
•
•
Message:
•
•
•
•



Similar Threads
Other Threads in the C++ Forum
Thread Tools Search this Thread



Tag cloud for C++
api application array arrays assignment based beginner binary c++ c/c++ calculator char char* class classes code coding compile compiler console conversion convert count data database delete developer display dll dynamiccharacterarray email encryption error file format forms fstream function functions game generator givemetehcodez graph iamthwee ifstream image input int java lib list loop looping loops map math matrix memory multidimensional multiple newbie news number numbertoword output pointer problem program programming project python random read recursion recursive reference return rpg search simple sorting spoonfeeding string strings struct template templates text tree url variable vector video visual visualstudio win32 windows winsock wordfrequency wxwidgets
About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC