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While trying to get some older code (probably from around 2001-2005 or so) to build, i cam across the following conditional include:

#if _MSC_VER >= 1300
#include <xmath.h>
#endif

I am currently building with Visual Studio 2012:

Microsoft (R) C/C++ Optimizing Compiler Version 17.00.61030 for x86

which gives a fatal error on this include:

fatal error C1083: Cannot open include file: 'xmath.h': No such file or directory

So to me, this looks like a non-standard Microsoft specific header that was supported from _MSC_VER 1300 (MSVC++ 7.0) on, but is currently no longer supported. My questions are:

  1. Is my assumption correct? If 'yes', from what version of MSVC++ is this header no longer supported?

  2. What is the purpose of including the xmath.h header? My code compiles fine without it, so I can probably just leave it out?

  3. Is xmath.h documented somewhere? I cannot seem to find any decent documentation on it using a simple Google search.

Bart Vandewoestyne
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1 Answers1

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xmath.h is part of the internal implementation of Microsoft's standard C++ library. There is no reason for your code to use it. If your code compiles fine without it, dump it.

Pete Becker
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