(As a forewarning, this will be long due to the code I
am including....sorry...)
Actually there are 2 strange behaviors. The first (brief)
one is this:
TRQMD FileList = new TRQMD(filename,10);
(FileList+0)->function(); // Root Seg fault
TRQMD *temp = FileList + 0; temp->function(); // Root ok
If (in ROOT), I type .g FileList, .g FileList+0, and
.g temp....I get the same address values for all 3.
What's even more confusing is that I use the (pointer+index)
syntax in the COMPILED .so for the 3 classes and root
doesn't complain about those!!! (And yes, index does take
a 0 value for each occurrence of the syntax) (Aye carumba)
The second strange behavior is more complicated....
Background: I've compiled my own "dll" (.so for linux)
with 3 classes to use for my research. Since this is
my first real attempt at classes (I'm mainly a C guy),
the heirarchy may not be the greatest (*shrug*). One
class for the file (and an array of pointers to the
events in the file), one class for the event (with an
array of pointers to the particles), and one class for
the particles (with Int_t and Float_t for 4P, mass, and
PID).
The best way I can describe the problem is thus (and this
may be a generic C++ thing, for which I apologize for my
newbie-ness):
A Class created by
Files = new TRQMD[NumFiles];
with a subsequent call to the overloaded constructor
TRQMD *TempRQMD = Files + x; // x is loop var
TempRQMD->TRQMD(filename, NumEvents);
does *NOT* work the same as:
TRQMD *File = new TRQMD(filename, NumEvents);
assuming NumFiles == 1 above.
Now, here is the funny part: Both code sequences ACTUALLY
read the file as it should!!!!(in the TRQMD(char *,int) call)
However, when I try to access the TempRQMD class functions,
they return member values that were set with TRQMD() despite the
TRQMD(filename, NumEvents) call. Lemme illustrate with the
command line entries that I got from root:
gSystem.Load("stage1.so");
FileList = new TRQMD[1]; // Same results is no [1]
TRQMD *TempRQMD = FileList;
TempRQMD->TRQMD("central-500evts-1.ascii", 10);
// Normal output from the function returning the
// Correct values read from the file
TempRQMD->GetEvents() // Should return 10...as passed in prev.
-->Root returns this: (Int_t)(-1)
-->Which is the value set by TRQMD() (from new construction)
However, this is the alternate output:
gSystem.Load("stage1.so");
FileList = new TRQMD("central-500evts-1.ascii", 10);
FileList->GetEvents()
-->Root returns this: (Int_t)10 // This is right!
Ok, as promised, here is some source code:
(This is from TRQMD.cxx)
TRQMD::TRQMD() {
fTotalEvents = -1;
fEventList = 0;
}
TRQMD::TRQMD(Char_t *filename, Int_t eventnum) {
// Some temp var declarations omitted
fTotalEvents = eventnum;
cout << "Eventnumber is " << fTotalEvents << endl;
// In root this prints out as 10!!!!
// rest of file read in code removed.
}
--
~~ WWW Page: http://quantum.phy.vanderbilt.edu/~tim/ ~~
Tim Miller | "Am I mature enough to get old?"
Vanderbilt University | --Me.
Graduate Studies in Physics |
Relativistic Heavy Ions |
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