Custom class with stl in tree -- GetEntries() returns 0

ROOT
1

Hi,

I am attempting to store a custom class in a TTree. The custom class has a stl::vector member of another custom class. After writing the tree, I open the file and try TTree::GetEntries(), which returns 0. Also, TTree::GetEntry() returns 0. However, if I use TTree::Print() I can see there are entries:

*Entries : 254 : Total Size= 30236 bytes File Size = 3547 *
*Baskets : 1 : Basket Size= 16000 bytes Compression= 4.34 *

I’m using root version 4.00/08, on a linux box with gcc version 3.4.3. This version should correctly handle stl, right?

I suspect it may have something to do with stl, since the previous version of this code did not use stl and I had no problems. Or possibly with the dictionary?

I also tried adding a “+” to the
#pragma link C++ class CustomClass+;
statement , but this does not help. (I previously did not have the “+”, but had no trouble.)

Thanks,
Brian

2

It is difficult to tell you more without seeing your class with STL.
However, note that a major upgrade of ROOT supporting STL collections was introduced in 4.02. I would strongly recommend to move to a newer version like 4.04 or better 5.04

Rene

3

I’m willing to believe the problem is with the version. Thanks.
(I’ve used version 4.04 in another environment and had no trouble.)

In this case, when I compile with version 4.02, 4.04 or 5.02, I get a runtime relocation error:

relocation error: (…) libNetx.so: undefined symbol: _ZN6TMutexC1Eb

If I ldd my executable (or any of my shared libs), I see no dependence on libNetx.so. I find it strange that I get this error in all of these ROOT versions, but not in 4.00.

I’ve attached a tarball with a simple executable (and Makefile) to illustrate this problem. When I compile with 4.00, everything runs fine. When I compile with 4.02 or higher, I see the relocation error.

Unfortunately, the file I accesssed is not open to the general public.

Is it possible that this problem comes about because I use a newer version of root than is running on the rootd server?

Thanks,
Brian
rootd_text.tar.gz (594 Bytes)