| title |
Control Flags | Microsoft Docs |
| ms.custom |
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| ms.date |
11/04/2016 |
| ms.technology |
|
| ms.topic |
conceptual |
| f1_keywords |
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| dev_langs |
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| helpviewer_keywords |
flags, control |
heap allocation, control flags |
debug heap, control flags |
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| ms.assetid |
8dbd24a5-0633-42d1-9771-776db338465f |
| author |
corob-msft |
| ms.author |
corob |
| ms.workload |
|
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.
Global Variables and Standard Types