Hi All,
I'm confused about how TTree is working.
I have a function that reads a text file, creates objects, fills a TTree with them, and returns a pointer to the TTree it created.
The TTree is created with a single explicitly-created branch to hold the main object, call it a1, with splitting set to maximum. This main branch contains a bunch of pointers to TObject-derived objects, which also contain pointers and TRefs to other objects:
(classes called A, B, and C. a1 instance of A, b1 and b2 instances of B, c1 instance of C.)
a1 has a pointer to b1. b1 has a TRef to a1.
a1 has a pointer to c1. c1 has a TRef to a1.
c1 has a TRef to b1.
c1 has a pointer to b2.
where pointers are used so the objects will be written, and TRefs used where necessary to prevent multiple instances being created.
(Philippe; much thanks for the help, it works now. no more memory leaks :)
A subsequent call to Draw() for a property of a1 works properly.
Calling Draw(...) causes a segfault if i try to draw a property of b1 by accessing it through a1's pointer to b1.
However, if I call SetBranchAddress(...):
A *pa1=0;
ptree->SetBranchAddress("Abranch",&a);
on the main branch of the tree giving it a null A* pointer before i call Draw(...), it works properly.
It also works properly if I first save the tree in a TFile and then read the tree from the file.
Is there a reason for this behavior, or is there something I'm doing wrong that would cause this?
or am I just confused?
Thanks in advance,
Brant Carlson
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