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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 directive for the routine declarations.