[This message was posted by Rolf Andersson of Pantor Engineering <[EMAIL PROTECTED]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/55fc4268 - PLEASE DO NOT REPLY BY MAIL.]
TANSTAAFL, although it may be true for a specific template, the average the cost is one bit (and Murphy may skew this a bit). I.e. in 1 case out of 7 (not 8) you pay one byte. Not even a _very_ good template designer will find the extra bit when he needs it :) > > The effect of 2 and 3 is that the one byte in 3 gets amortized over 8 > > reference occurrences of the field. Less than 8 references per > > definitions results in pmap being more compact, more than 8 references > > means leading zero byte results in definition being more compact. > > Since FAST is a byte-level protocol, it is an all or nothing cost. > Either using an additional presence bit increases the presence map size > or it doesn't. This is up to template designers to take into account. [You can unsubscribe from this discussion group by sending a message to mailto:[EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/FIX-Protocol?hl=en -~----------~----~----~----~------~----~------~--~---
