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[C++] va_list

 
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rapion124
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PostPosted: Tue Apr 29, 2008 6:28 pm    Post subject: [C++] va_list Reply with quote
I just started C++ a few months ago. One concept I still don't understand is a function that takes an infinite number of arguments i.e. printf(). Then, I saw that it has something to do with va_list and va_arg. Can anyone explain to me how to use them?
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Renkokuken
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PostPosted: Wed Apr 30, 2008 1:13 am    Post subject: Reply with quote
va_start/va_end, pretty straight-forward.

http://www.lix.polytechnique.fr/~liberti/public/computing/prog/c/C/MAN/va_start.htm
http://msdn.microsoft.com/en-us/library/kb57fad8.aspx
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atom0s
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PostPosted: Wed Apr 30, 2008 10:32 am    Post subject: Reply with quote
Example:

Code:
void __cdecl DebugPrintF(const TCHAR *format, ...)
{ 
   TCHAR buf[4096], *p = buf; 
   va_list args; 

   va_start(args, format); 
   p += _vsntprintf_s(p, sizeof buf, sizeof buf-1, format, args);
   va_end(args); 

   while ( p > buf  &&  isspace(p[-1]) ) 
      *--p = '\0'; 

   *p++ = '\r'; 
   *p++ = '\n'; 
   *p   = '\0'; 

   OutputDebugString(buf); 
}

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