c++ - Purpose of stdafx.h

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/2976035/purpose-of-stdafx-h

Answer 1

stdafx.h is a file, generated by Microsoft Visual Studio IDE wizards, that describes both standard system and project specific include files that are used frequently but hardly ever change. Compatible compilers (for example, Visual C++ 6.0 and newer) will pre-compile this file to reduce overall compile times.

Visual C++ will not compile anything before the #include "stdafx.h" in the source file, unless the compile option /Yu'stdafx.h' is unchecked (by default); it assumes all code in the source up to and including that line is already compiled.

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