Hi all, somehow I didn't find the right subject. I have to general questions concerning branches. I think, they are quite common, so I hope, that somebody can give me some advice. i) In my program I have a set of data classes, which can be stored in a tree, each as a seperate top-level branch. The set is not fixed, number and type of classes can vary depending on the user analysis of data. Since I have different types of classes, e.g. representing raw data, calibrated data, intermediate results, etc., I really like to store them in some hierachy within the tree rather then having them as top-level classes. Normally one would do that writing a class for each category holding one object of each data class. However, this would break the flexibility and modularity. Whenever adding/removing a data class, the 'top-level' classes have to be redefined. That's not appropriate for me. Is there any way to form (dynamically) a hierachy in a tree. Let's say I have three class objects 'det1', 'det2', 'det3' and I want to put them into a top-level hierachy 'raw' in the tree. Without forming any additional classes! ii)Some of these classes are used twice or more, because similiar sets of detectors are used or the data are raw/calibrated. There are variables in the classes, which only change from instance to instance, but not from event to event. However, they are used to identify the object and the analysis conditions when the tree is read back later. As far as I know, there are only two modes to handle these data, either to write them to the tree as a normal variable and, therefore, write the same value for each entry, or to discard the variable at all. Both are not very convenient. To store these data in a separate class is not practical due to modularity and flexibility. As I see this, the best solution would be, if a TBranch could store some pseudo-constant variables of the class at the beginning, which will not change later on. Are they any suggestions to handle these tasks? Thanks in advance and best regards, Volker -- Dr. Volker Hejny Tel: 02461/616853 ** Institut f. Kernphysik Fax: 02461/613930 ** ---------------------------------------------------------------- ** ** --- Forschungszentrum Juelich GmbH, D-52425 Juelich **
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