Re: Weird crash when calling Dump on this CINT object...
Rene Brun (Rene.Brun@cern.ch)
Thu, 23 Oct 1997 09:18:54 +0200
Gordon Watts (Brown University) wrote:
>
> Hi,
> The below file is called "bummer.cpp" I use ".L bummer.cpp" to load it
> into CINT in Root (1.03/05, Windows NT), and then do:
>
> junk stuff;
> stuff.Dump();
>
> And I access violate (i.e. root crashes). Am I doing something stupid, or
> is this a bug? I was doing this chasing down a second problem.... I notice
> that for some of my objects the Dump prints garbage for array members... is
> this a known problem?
>
> CHeeers,
> Gordo.
>
> {
> class junk : public TObject {
> public:
> float _position[3];
> float _temp;
> int _temp_i;
> float _met[2];
>
> junk (void)
> { _position[0] = 0; _position[1] = 0; _position[2] = 0;
> _temp = 0; _temp_i = 0; _met[0] = 0; _met[1] = 0;};
>
> };
> }
Interpreted classes cannot derive from compiled classes
with the current versions of ROOT and CINT. Interpreted classes
can call compiled classes.
We know that this is a very important limitation of the interpreter.
However, the implementation of this feature requested by many users
is non-trivial. The virtual table of the interpreted class
must be patched with the VTBL of the compiled class.
The native compiler may have to call a function of your
interpreted class ! Implementing this feature is highly compiler
dependent (Masa, may be you can comment this point).
We recommend creating/compiling your own classes via the standard
compiler (see examples of makefile in ROOTSYS/test/Makefile).
This makefile shows how to make your own classes callable from
the interpreter.
Rene Brun