> Eric Lemings wrote: > > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> >> Author: faridz >> Date: Wed Apr 23 08:20:07 2008 >> New Revision: 650902 >> >> URL: http://svn.apache.org/viewvc?rev=650902&view=rev >> Log: >> 2008-04-23 Farid Zaripov <[EMAIL PROTECTED]> >> >> STDCXX-880 >> * src/num_put.cpp: Added simple overloads of the >> __rw_isfinite(), __rw_signbit(), __rw_isinf(), >> __rw_isnan(), __rw_isqnan(), __rw_issnan() >> for float and long double types. >> >> Modified: >> stdcxx/trunk/src/num_put.cpp >> > > >With just a quick review, this change looks a bit suspicious. The >respective overloads for type double are all defined within >conditional-compile directives. It follows that float and long double >overloads would be defined similarly unless I'm missing something. >
The overloads on double are in platform specific #ifdef blocks because they have platform specific code in them (_finite, finite, isfinite). At least that is the only reason I see for it. So I don't really see the overloads on float and double outside of platform specific blocks as a problem as there is no platform specific code in them. I'm more worried about why the overloads on float and long double are added at all. If they are only being called from __rw_fmat_infinite(), and that function only works with a double, then I see no motivation for the overloads. I'm also wondering why we provide default implementations of these functions if we know good and well that the results are wrong (for platforms that don't define _WIN32, _RWSTD_OS_SUNOS, or fpclassify). Shouldn't we fail to compile in this case? The other thing that freaks me out is the implementation of __rw_signbit on platforms defining _RWSTD_OS_SUNOS. It assumes something similar to IEEE-745 double representation. This may be a safe assumption for the time being, but what happens if the user compiles with -fnonstd? Does this still work? >Brad. >
