afxMemDF
Visual Studio 2010
This variable is accessible from a debugger or your program and allows you to tune allocation diagnostics.
int afxMemDF;
afxMemDF can have the following values as specified by the enumeration afxMemDF:
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allocMemDF Turns on debugging allocator (default setting in Debug library).
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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.
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checkAlwaysMemDF Calls AfxCheckMemory every time memory is allocated or freed. This will significantly slow memory allocations and deallocations.