Hi, I have used stl stuff wrapped into my own objects - this definitely works fine. Why don't you just give it a try to put a map in a root file without wrapping it? It's not true (anymore) that all objects in a tree have to derive from TObject. You'll run into a problem with your map though. To my knowledge Root is not able to parse nested stl containers. What I would advise you to do is to write your own class which handles a pair of ints and use map<My2IntsClass, int> instead. Don't forget to implement the My2IntsClass::operator > (or a global operator >, taking two const My2IntsClass &), otherwise your map won't work properly... Good luck! Cheers, Axel. > -----Original Message----- > From: owner-roottalk@pcroot.cern.ch > [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Phil Adamson > Sent: Wednesday, September 12, 2001 11:10 AM > To: roottalk@pcroot.cern.ch > Subject: [ROOT] TTree, std::map > > > Hi Folks, > > I have a map (in fact, map<pair<int,int>,int>) that I would like to use as > a branch in a TTree. As far as I can see from the documentation, I can > only put basic types or TObjects into TTrees. So does that mean that I > have to wrap my map in a TObject? Have I misread the docs, and I can put > bare maps in a TTree? > > Is anyone else putting maps in a TTree? What do you do? > > Phil > >
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