"Marco" == Marco Antoniotti <marcoxa@cs.nyu.edu> writes:
>> On Jan 11, 2017, at 17:14 , Raymond Toy <toy.raymond@gmail.com> wrote: >> >>>>>>> "james" == james anderson <james.anderson@setf.de> writes: >> james> good morning; >>>> On 2017-01-11, at 09:48, Marco Antoniotti <marcoxa@cs.nyu.edu> wrote: >>>> >>>> Thank you James, thank you Stelian. >>>> >>>> The CFFI solution seems very interesting and the codec James pointed me to are also useful. >> james> i sent marco an off-line note, in which i had pointed out some code which figures (among other things) in an amqp implementation, where it is figures in buffer codecs. james> for the curious, it is to be found here: >> james> https://github.com/lisp/de.setf.utility/tree/master/codecs/float-codecs.lisp >> >> This is also pretty nice and mostly portable. I think with a bit of >> work it can be made (almost) completely portable using just CL >> functions. I guess the main problem is constructing infinities. >> Testing for NaN is pretty easy: (= x x) is always false if x is NaN. Marco> Do you have an idea about how to go ahead and construct infinities? In pure CL? No, I don't know of any way to do that. Besides, support for infinities isn't required. I don't think clisp can handle infinities (or NaNs?). At best, the CL implementation has a way to do it, or you can use cffi. -- Ray