[geos-devel] NaN

Todd Vollmer tvollmer at digitalglobe.com
Tue Aug 19 10:37:08 EDT 2003

I don't believe that C++ has a standard for any that you mention. It is
machine dependant. NAN is a IEEE standard. Take a look in the math.h for NAN

Todd V.

-----Original Message-----
From: Paul Ramsey [mailto:pramsey at refractions.net]
Sent: Monday, August 18, 2003 7:33 PM
To: GEOS Development List
Subject: [geos-devel] NaN

What is this about? Doesn't C++ have some standards for representing 
NaN, Inf, and -Inf?

  //Defines NaN for intel platforms
  #define DoubleNotANumber 1.7e-308

  //Don't forget to define infinities
  #define DoubleInfinity 1.7e+308
  #define DoubleNegInfinity -1.7e+308


      | Paul Ramsey
      | Refractions Research
      | Email: pramsey at refractions.net
      | Phone: (250) 885-0632

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