David Abrahams <dave@boost-consulting.com> writes:
"Paul A Bristow" <pbristow@hetp.u-net.com> writes:
The expense is the brain power required to produce a high quality implementation which proved more than expected for TR1 functions.
IMO part of the problem is the unrealistic expectation of the Standards WGs for an accuracy similar to that for most of the other functions like sin, cos for which it IS feasible, albeit with care and skill, to get within a bit (ulp) or few.
For some of the other functions, getting within a few decimal places is challenging.
What leads you to believe there is such an unrealistic expectation? I don't see any mention of accuracy in the proposed TR (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf for reference).
Never mind; obviously I should read entire postings before replying to them. Sorry :( -- Dave Abrahams Boost Consulting www.boost-consulting.com