Yes - this looks potentially rather useful for some tasks, especially embedded systems. Why on earth didn't the language include fixed point and/or fractional types?
As you observe, the increased accuracy compared to float (just a little too small for some measurements like weights) but with half the memory of double, and of course the integer/binary nature are sometimes useful. Do you have any test programs? Have you made any comparison with float and double speeds? HTH to encourage you. Paul Paul A Bristow, Prizet Farmhouse, Kendal, Cumbria, LA8 8AB UK +44 1539 561830 Mobile +44 7714 33 02 04 Mobile mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Kevin Atkinson > Sent: Thursday, February 27, 2003 2:29 AM > To: Boost mailing list > Subject: [boost] Is there any Interest in a Fixed Point Library? > > > > Is there any interest in a fixed point math library. Using templates the > compiler can keep track of the radix point for you making using fixed > point math a lot less tedious and error prone. > > Attached is a rudimentary implementation which would work acceptably when > the exponent is not too large or too small. If the exponent is smaller or > larger than the size of the underlying integer in bits this code will > likely behave badly. > > I plan to use the attached code to avoid having to deal with serializing > floating point numbers. A exponent of -30 (-31 if using an unsigned 32 > bit integer) is especially useful for representing numbers between 0 and > 1. The precision will actually be a bit better than a 32 bit float since > the exponent does not have to be stored. > > Comments on the code welcome. I am not a numerical analysis specialist so > don't expect me to write a fixed point library for anything beyond simple > arithmetic. > > -- > http://kevin.atkinson.dhs.org > _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
