Re: [boost] [serialization] facets for non-finite numbers

Hubert Holin wrote:

*Negative* Not-A-Number? What is such a beast,

According to the IEEE 754 standard there is such a beast. According the C99 standard, negative NaN (not-a-number) should be represented as "-nan" in text streams. Negative NaN is simply a naN with a binary representation where the sign bit is 1. There is no mathematical interpretation. The expression -std::numeric_limits<T>::quiet_nan() gives you a negative NaN.

and what should it be used for?

No idea. --Johan Råde