[This message was posted by Marc Battyani of HPC Platform <[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/5687ec8d - PLEASE DO NOT REPLY BY MAIL.]
David, > I think additional constraints on the fields and types in the template > may be a good thing. However, I think they're best expressed using the > extensibility feature of the template syntax. This way a constraints > specification can be developed separately from the core specification. > > An optimizing processor could then utilize the extra information if > present. A simpler implementation would just ignore it automatically > as > specified in the core specification. Yes but by doing this, the information will not be normalized. So it could be MaxLength or MaxSize or StringLength or whatever. If some attributes are added to the FASt spec then people will be reminded of specifying them and everybody will use the same unambiguous names. Marc > > An hypothetical example: > > <template name="Example" xmlns:c="http://example.org/fast-constraints";> > <string name="SenderCompID" c:maxLength="20"/> </template> > > /D > > > Hi all, > > > > Here is a small extension proposal aimed at making things easier for > > FAST decoder writers: a MaxLength string attribute > > > > FAST compilers need to know the maximum string size for a field in > > order to be able to use pre-allocated string buffers in memory. > > > > Generally this maximum string size is given in the user documentation > > going with the FAST templates but it should also be in the templates > > so that compilers can get that information and use it. > > > > On the same topic, Min/Max attributes for integers would be a good > > thing too. Or maybe smaller types like Integer8 and Integer16 would > > be enough. > > > > I know some people would rather like to remove and not add new > > features but I think it's better to improve what we already have. > > > > BTW is there a page somewhere with the all the officials 1.2 extension > > proposals? > > > > Marc [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 -~----------~----~----~----~------~----~------~--~---
