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why new operator can't be overloaded

Posted on 2003-11-24
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why new operator can't be overloaded in c++?
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Question by:t_kaur
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by:jconde
jconde earned 240 total points
ID: 9809255
The new operator *can* be overloaded in C++ ... There is usually no need for overloading it, but sometimes, its the easiest way to keep complete track of memory leaks.  When developing complex application where the code must be completely portable, I usually override the new and delete operator to detect memory leaks.  Its the easiest and cheapest way of knowing when you have a mem-leak or not.

here are some links which you might find useful:

http://www.flipcode.com/tutorials/tut_memleak.shtml
http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarvc/html/msdn_fangle.asp
http://community.borland.com/article/0,1410,18041,00.html
http://www.bearcave.com/software/c++_mem.html
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Sys_Prog earned 260 total points
ID: 9816038
In C++, new as well as delete can be overloaded.

But that does not mean that u can bypass the Constructor and destructor calls.

Normally, the new operator is responsible for the following tasks

1. Allocate memory [usually done using malloc OR equivalent]
2. Call the Constructor for the newly allocated objects

Thus, u cannot get hold of the allocated memory before the contsrtcir call.

Now, when u overload new, the only part u can replace is the 1st part. The second part is bound to happen.
Similarly with delete.

While overloading new, u have 2 options
Either overload it globally OR overload it for a class

when u overload globally, all your memory allocation new calls will go to your overloaded one
If u overload for a class, only the new calls for that class would go to the overloaded one

Your overloaded operator function should return a void *, and it should take a parameter of type size_t.

This size_t value would be supplied by the compiler

HTH

Amit



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