On 6-Jan-2005, Bill Northcott <[EMAIL PROTECTED]> wrote: | On 06/01/2005, at 9:12 AM, Thomas Lumley wrote: | >> It was suggested by one of the gcc people, but I could find no | >> documentation about it. The ISO C++ docs do not include isnan as a | >> symbol provided by cmath within the std namespace. I looked at the | >> gcc source code and could see no reason why it should work. | > | > Hmm. What *are* C++ programmers supposed to use to test for NaN, | > then? It might well not be anything in the ISO standard, just as it | > isn't in C89, but surely there is some prescribed way to do it. | | I asked the same question. So far I got no response.
What I finally decided to do for Octave was to use a C language autoconf test for isnan, then provide a function declared "extern C" that is a wrapper around the C isnan function (if it exists). I also use this method for other functions that may be easier to call from C than directly from C++. jwe -- www.octave.org | www.che.wisc.edu/~jwe | Peace would shock and awe me. ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
