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How will you detect if there is memory leak in your C++ program?

Total Answers and Comments: 6

Last Update: October 05, 2009 Asked by: rusty_man

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November 08, 2007 03:20:37

#1

Herojeet

RE: How will you detect if there is memory leak in you...

Run "Rational Purify" it will show you all the leaks

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November 26, 2007 10:12:29

#2

Member Since: November 2007 Contribution: 1

RE: How will you detect if there is memory leak in you...

Well "Rational Purify" is one way. If I was conducting the interview I would ask a contra question immediately asking how to do that if you do not have a port of the tool for the OS (Riviera Symbian etc.) you are using.
In this case you will need to find a way to precisely measure how much memory you have before and after you run the program. If there is a difference than you have a memory leak. How you do that vary from system to system. You will need to dig yourself in the documents for the system.

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December 20, 2007 01:11:02

#3

Member Since: December 2007 Contribution: 1

RE: How will you detect if there is memory leak in your C++ program?

If you are using new and delete operator you can overload both the operators and can count number off heap allocation and deallocation. You can also get the __FILE__ and __LINE__ to get to know the file name and line number. Now the new and delete of a memory location should be in pair and if its not there is a memroy leak. By using line and file utility you can reach upto the exact location.

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December 07, 2008 09:41:00

#4

Member Since: December 2008 Contribution: 20

RE: How will you detect if there is memory leak in your C++ program?

If memory cannot be allocated dynamically new throws bad_alloc such message will be displayed at execution.
If so then
Use cout statement in destructor to check if it was invoked (i.e. memory deallocated)

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February 18, 2009 01:41:43

#5

santhosh.kanchanapally

Member Since: April 2008 Contribution: 10

RE: How will you detect if there is memory leak in your C++ program?

By overloading the new and delete operators we can find the memory leaks as shown in following program

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
int count 0;
void * operator new(size_t size)
{
count++;
cout<<"The size of memory allocated:"<<size<<"byes"<<"n";
return malloc(size);
};
void operator delete(void * mem)
{
count--;
free(mem);
};
int _tmain(int argc _TCHAR* argv[])
{
//int length sizeof("Santhosh");
char* Name (char*)operator new (sizeof("HelloWorld"));
strcpy_s(Name sizeof("HelloWorld") "HelloWorld");
operator delete(Name);
cout<<"The number of memory leaks:"<<count;
getchar();
}

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October 04, 2009 12:37:38

#6

Member Since: August 2008 Contribution: 2

RE: How will you detect if there is memory leak in your C++ program?

In LINUX environment one can use VALGRIND and MPATROL free tools to find out possible memory leaks in programs.

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