What Does stdafx.h Do in Visual Studio Projects?

What's the Role of the stdafx.h Header in Visual Studio?

stdafx.h is a crucial file generated by Microsoft Visual Studio IDE wizards. It acts as a repository of both standard system and project-specific include files that are regularly used but rarely modified.

Understanding Precompiled Headers

The uniqueness of stdafx.h lies in its integration with precompiled headers. Compatible compilers, such as Visual C 6.0 and later, leverage this file to pre-compile certain include operations, thereby minimizing overall compilation time.

By default, Visual C assumes that all code in the source file before the inclusion of "stdafx.h" has already been compiled. This assumption is based on the use of precompiled headers unless the /Yu'stdafx.h' compile option is explicitly disabled. As a result, any code prior to the "stdafx.h" inclusion is effectively skipped during compilation, further enhancing efficiency.

For more in-depth information on precompiled headers, consult the Wikipedia article at:

http://en.wikipedia.org/wiki/Precompiled_header

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