By including crtdbg.h malloc and free functions will be replaced to their debug versions, _malloc_dbg and _free_dbg. This will keep track of your memory allocation and deallocation.

To get the memory leak information, we can use _CrtDumpMemoryLeaks(); function whenever required

E.g:

#define _CRTDBG_MAP_ALLOC

/* _CRTDBG_MAP_ALLOC is to get the extended information on error reporting. This is actually optional */

#include

void Allocate()

{

int * pIntArray = new int[100];

}

int _tmain(int argc, _TCHAR* argv[])

{

int * pIntArray = new int[100];

for ( int i = 0; i < 5 ; i++ )

Allocate();

_CrtDumpMemoryLeaks(); // Dump memory leak information

return 0;

}

Alternate method to automatically invoke “_CrtDumpMemoryLeaks();” on program exit

You can call _CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF ); function as specified in the beginning of your program. This will automatically call CrtDumpMemoryLeaks(); function on program exit

#define _CRTDBG_MAP_ALLOC

#include

void Allocate()

{

int * pIntArray = new int[100];

}

int _tmain(int argc, _TCHAR* argv[])

{

// Call this in th beginning of program

_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );

int * pIntArray = new int[100];

for ( int i = 0; i < 5 ; i++ )

Allocate();

return 0;

}

Check MSDN for more information