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c++linuxdoublelimitinfinity

What's the recommended workaround if numeric_limits<double>::has_infinity is false?

I need to check a double value for infinity in a C++ app on Linux. On most platforms this works by comparing with std::numeric_limits<double>::infinity(). However, on some old platforms (RedHat 9 for example, with gcc 3.2.2) this is not available, and std::numeric_limits<double>::has_infinity is false there.

What workaround would you recommend for those platforms?

Solution

  • Ok, I have now resorted to using the INFINITY and NAN macros on that particular machine - seems to work fine. They come from math.h.