Control Flags

The debug version of the Microsoft C run-time library uses the following flags to control the heap allocation and reporting process. For more information, see CRT Debugging Techniques.

Flag Description
_CRTDBG_MAP_ALLOC Maps the base heap functions to their debug version counterparts
_DEBUG Enables the use of the debugging versions of the run-time functions
_crtDbgFlag Controls how the debug heap manager tracks allocations

These flags can be defined with a /D command-line option or with a #define directive. When the flag is defined with #define, the directive must appear before the header file include statement for the routine declarations.

See also

Global Variables and Standard Types