afxMemDF 

int afxMemDF;

Remarks

This variable is accessible from a debugger or your program and allows you to tune allocation diagnostics. It can have the following values as specified by the enumeration afxMemDF:

• allocMemDF   Turns on debugging allocator (default setting in Debug library).
  
  
• delayFreeMemDF   Delays freeing memory. While your program frees a memory block, the allocator does not return that memory to the underlying operating system. This will place maximum memory stress on your program.
  
  
• checkAlwaysMemDF   Calls AfxCheckMemory every time memory is allocated or freed. This will significantly slow memory allocations and deallocations.

Example

// example for afxMemDF
afxMemDF = allocMemDF | checkAlwaysMemDF;