The Debug Heap from C++

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The debug versions of the C run-time library contain debug versions of the C++ new and delete operators. If you use the _CLIENT_BLOCK allocation type, you must call the debug version of the new operator directly or create macros that replace the new operator in debug mode, as shown in the following example:

Replacing the new operator

/* MyDbgNew.h
 Defines global operator new to allocate from
 client blocks
*/

#ifdef _DEBUG
   #define DEBUG_CLIENTBLOCK   new( _CLIENT_BLOCK, __FILE__, __LINE__)
#else
   #define DEBUG_CLIENTBLOCK
#endif // _DEBUG


/* MyApp.cpp
        Use a default workspace for a Console Application to
 *      build a Debug version of this code
*/

#include "crtdbg.h"
#include "mydbgnew.h"

#ifdef _DEBUG
#define new DEBUG_CLIENTBLOCK
#endif

int main( )   {
    char *p1;
    p1 =  new char[40];
    _CrtMemDumpAllObjectsSince( NULL );
}

The Debug version of the delete operator works with all block types and requires no changes in your program when you compile a Release version.

See Also

Other Resources

The CRT Debug Heap