Hi Daniel, Please read the discussion on the migration to the new scheme at page 204 of the Users Guide. Rene Brun Magestro Daniel wrote: > > Hi all, > > I have read old roottalk posts as well as the latest Root manuals, but I > cannot find the solution to a basic problem. (We are currently using > v2.25/03.) > > In our analysis, all of our data classes use split level = 2. The problem > is that, if we change a class definition (for example, changing the name of > a data member), adding a custom streamer to that class does not work because > the streaming for the class is done by TClonesArray/TBranchClones. The > class streamer is not called at all. > > I read in the Users Guide v3.1 that, in Root 3, there is a BypassStreamer() > function in TClonesArray which allows one to force the use of individual > class streamers. This (in addition to TStreamerInfo) should solve the > problem for class def changes which take place after we migrate to Root 3. > However, is there a way to read our old files created with v2.25/03 if we > now change the class def? We have a large volume of files which fit this > description, and of course we would like to avoid having to maintain two > versions of our code. > > Any ideas would be greatly appreciated... thanks, > > Dan > ------------------------------------------- > | Daniel Magestro +44-6159-71-2147 | > | magestro@gsi.de GSI/Kernphysik I | > | www.gsi.de/~magestro Planckstr. 1 | > | < last updated > 64291 Darmstadt | > | < Aug 6, 2001 > Germany | > ------------------------------------------- >
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