Correct, which is why uninitialised needs to be distinct from NaN

In C, the creation of an mpfr_t variable is done as follows: 
mpfr_t x; /* declaration */
x = mpfr_init(); /* initializes x with a value of NaN */

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x cannot be used for anything until it has been initialized - and once initialized, x remains NaN until some other value gets assigned to it.
"Math::MPFR->new();" wraps those 2 steps. Maybe it should stop short of calling the mpfr_init() ... I'd have to play about with it before I could get my head around the usefulness (or otherwise) of doing so.

Cheers,
Rob

In reply to Re^6: NaNs are true by syphilis
in thread NaNs are true by syphilis

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