[Rd] Standalone Mathlib, C++ and ISNAN()

Bill Northcott w.northcott at unsw.edu.au
Wed Jan 5 22:29:18 CET 2005

On 06/01/2005, at 6:53 AM, Thomas Lumley wrote:
> I believe (with a little Googling) the suggested C++ approach is to 
> use std::isnan if <cmath> is included.
I tried that too, but without any success.  I even tried 

It was suggested by one of the gcc people, but I could find no 
documentation about it.  The ISO C++ docs do not include isnan as a 
symbol provided by cmath within the std namespace.  I looked at the gcc 
source code and could see no reason why it should work.

Bill Northcott

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