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Visual Studio 2012

Visual C++

C++ Language and Standard Libraries

C Run-Time Library Reference

Global Variables and Standard Types

Control Flags

_CRTDBG_MAP_ALLOC

_DEBUG

_crtDbgFlag

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_DEBUG

Visual Studio 2012

The compiler defines _DEBUG when you specify the /MTd or /MDd option. These options specify debug versions of the C run-time library.

For more information, see CRT Debugging Techniques.

Reference

Control Flags

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