| -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Tobias Schwinger | Sent: 17 May 2005 16:53 | To: boost@lists.boost.org | Subject: [boost] Re: Math constants - updated. | | Paul A Bristow wrote: | > | > The current state also lacks extensibility. It is not | > | acceptable to rely | > | > on an external code generator. We have a great preprocessor | > | library for | > | > jobs like this one. It is desirable to have user-defined | > | constants for | > | > arbitrary types, which can be defined from within user code | > | on-the-fly, | > | > using a self-contained code generator. | > | > | > | | > | This sounds like a pretty cool idea to me. | > | > Well cool indeed - provided the preprocessor can do 50 decimal digit | > accuracy floating point ;-) | > | > So far macros seem to be struggling with ANY floating point calculations! | The preprocessor is only used for pasting in my example, no | calculations are | involved - the precision of the values depends on the quality | of the input. | | A misunderstanding ?? Well I agree that you are not using it now - but I just wanted to be quite sure that your extensions ideas didn't include using it. It would be exceedingly cool if a preprocessor 'did' floating point at all, especially arbitrary precision. But I'm not holding my breath ;-) Paul Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539 561830 +44 7714 330204 mailto: pbristow@hetp.u-net.com