std::numeric_limits::is_iec559

[Gabriel Dos Reis]

Roberto Bagnara <bagnara@cs.unipr.it> writes:

| I have always used std::numeric_limits::is_iec559 thinking that,
| as per the C++ standard, it yielded "[t]rue if and only if the type
| adheres to IEC 559 standard."
| 
| On a Mac OS X 10.4 machine with GCC 4.0.1, however, I get the value
| true for long doubles but, as far as I can tell, the layout of
| long doubles there does not conform to the 128-bit format specified
| by IEC 559.

I don't follow.  Exactly in what aspect do you believe the Mac OS X
10.4 representation is not conformant to IEC 559?

-- Gaby