TTree using objects but not dictionary?

ROOT
1

I am wondering if it is possible to somehow store “home made” objects in a TTree without generating a dictionary with CINT.

2

No it is not possible at the moment.
You need to generate the dictionary (either via CINT or via genreflex).

However, generating the dictionary is usually very simple :slight_smile:
In the usual case, you case simply do:root [] .L myclass.cxx+and you are done.

Cheers,
Philippe.

3

Thanks for a quick reply. I am compiling my code with the root libraries, and I keep getting errors such as these:

Warning in TClassTable::Add: class BuildEvent already in TClassTable

when I start my code … and I can not figure out how to avoid them, that’s why I was hoping to be able to avoid the whole dictionary thing :confused:

4

Hi,

This actually means that you are generating (or loading) the dictionary for BuildEvent twice!
However do you generate the dictionary for BuildEvent?

Cheers,
Philippe.

5

I have this bit in the end of my Makefile:

BuildEvent.$(ObjSuf): BuildEvent.h

EventDict.$(SrcSuf): BuildEvent.h LinkDef.h
@echo “Generating the dictionary $@…”
@rootcint -f $@ -c $^
@echo “$@ done”
.$(SrcSuf).$(ObjSuf):
$(CXX) $(CXXFLAGS) -c $<

The main program is linked together with BuildEvent.cpp (implementation file) and the EventDict.

6

By the way, I guess I should tell you that I use version 5.18 of root.

7

Hi,

What you gave looked ok. Maybe you are linking both against the EventDict.cxx and a library that also contains it.

Maybe the best way to proceed is to upload a complete running example showing the problem.

Cheers,
Philippe.