Dear All,
I built a class Waveform and a class Event. Both of them successfully compile and are shared libraries which I can use interactively with no errors.
One of the data members of the Event class is a pointer to an array of pointers to Waveform objects. Other members are just Double_t or Long64_t numbers.
[code]class T30Event : public TObject {
protected:
Waveform ** w;
public:
ULong_t unixtime;
[/code]
To add a Waveform object to the Event class there is a method who does the following:
Waveform* T30Event::AddWaveform(Waveform *waveform, UInt_t i){
if(!w) w = new Waveform*[6];
w[i] = waveform;
return w[i];
}
It works perfectly interactively since I can use the Draw method and see the waveform that I added.
But when I try to fill a tree with an Event to which I added a Waveform I get this error:
*** Break *** segmentation violation
#0 0x00206422 in __kernel_vsyscall ()
#1 0x04c6de53 in __waitpid_nocancel () from /lib/libc.so.6
#2 0x04c0a833 in do_system (line=<value optimized out>) at ../sysdeps/posix/system.c:149
#3 0x0017931d in system (line=0x879d6c0 "/etc/root/gdb-backtrace.sh 18668") at pt-system.c:29
#4 0x00b52e3d in TUnixSystem::Exec(char const*) () from /usr/local/lib/root/libCore.so
#5 0x00b5869c in TUnixSystem::StackTrace() () from /usr/local/lib/root/libCore.so
#6 0x00b599f5 in TUnixSystem::DispatchSignals(ESignals) () from /usr/local/lib/root/libCore.so
#7 0x00b59afd in SigHandler(ESignals) () from /usr/local/lib/root/libCore.so
#8 0x00b4fbf2 in sighandler(int) () from /usr/local/lib/root/libCore.so
#9 <signal handler called>
#10 0x00000000 in ?? ()
....(etc. etc.)
That doesn’t happen if I fill the tree with an empty Event (or if I fill in any other data member of the Event object).
The smaller code which reproduces this is:
gSystem->Load("libT30Event.so");
TFile *f = new TFile("071109-19.root","RECREATE");
TTree* tree = new TTree("071109-19","Incoming, reflected and transmitted waves measured on 071109");
T30Event* e = new T30Event();
TBranch* eventBranch = tree->Branch("events","T30Event", &e, 128000, 1);
Double_t v[6][1000];
for(UInt_t k=0; k<6; k++) {
for(UInt_t j=0; j<1000; j++) {
v[k][j]=j;
}
}
for(UInt_t k=0; k<6; k++) {
e->AddWaveform(v[k],1000,k);
}
tree->Fill();A far as I understand there is some lost pointer or something like that but I really cannot understand where exactly the problem is.
Please help me! 
Andrea
T30Event.cpp (11.5 KB)
T30Event.h (2.42 KB)
Waveform.cpp (8.38 KB)
Waveform.h (1.79 KB)