nice find proposed descriptions for getpayload[fl]() setpayload[fl]() setpayloadsig[fl]() are in http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1664.pdf as a bonus these functions provide a way to create a nan without resorting to strtod("nan",0) i.e., exactly what ast need because it provides strtod() sfscanf() etc. this is what i was anticipating in the ast nan payload patch
the only disconnect is that the api deals with floating payloads but describes the payloads themselves as non-negative integers I guess they do this in case the largest payload value is greater than the largest native integer On Thu, Nov 21, 2013 at 6:57 AM, Cedric Blancher <cedric.blanc...@gmail.com>wrote: > > http://webcache.googleusercontent.com/search?q=cache:ysNpbShMwdwJ:www.open-std.org/jtc1/sc22/wg14/www/docs/n1755.pdf+&cd=40&hl=de&ct=clnk&gl=de > has an interesting comment about Nan payloads: > > In added F.10.13, insert the paragraph: > IEC 60559 defines the payload of a quiet or signaling > NaN as an integer value encoded in the significand. > The payload is intended to represent implementation- > defined diagnostic information about the NaN. The > functions in this clause enable getting and setting > payloads. > > Does anyone know how the set/get functions are named and how they work? > > Ced > -- > Cedric Blancher <cedric.blanc...@gmail.com> > Institute Pasteur >
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