I am having odd problems while trying to create an basic C++ array of
objects from a precompiled class. Briefly, the interpreter crashes.
I do this on:
Linux persil 2.0.33 #7 Sat Apr 11 04:37:43 PDT 1998 i686 unknown
with the egcs-g++ version of root.
Here is how to reproduce the problem:
create myclass.hh:
#ifndef __myclass__
#define __myclass__
class myclass {
public:
myclass();
~myclass();
void myprint() const;
void SetX( const float & x );
void SetY( const float & y );
private:
float fX; // x position in centimeters
float fY; // y position in centimeters
};
#endif
create myclass.cc:
#include <stdio.h>
#include "myclass.hh"
myclass::myclass() : fX(-1), fY(-1) {}
myclass::~myclass() {}
void myclass::SetX( const float & x ) { fX= x; }
void myclass::SetY( const float & y ) { fY= y; }
void myclass::myprint() const {
printf("fX = %f, fY = %f\n",fX,fY);
}
rootcint myclass:
persil:~/scratch> rootcint -f myclassCint.cc -c myclass.hh
Note: operator new() masked 1c
Note: operator delete() masked 1c
Class myclass: Streamer() not declared
Class myclass: ShowMembers() not declared
compile:
persil:~/scratch> g++ -fPIC -shared -o myclass.so myclassCint.cc
myclass.cc -I${ROOTSYS}/include
persil:~/scratch>
create macro bugdemo.cc:
{
for( int i= 1; i<3; i++ ) {
int ntrack= 3*i;
myclass* varr= new myclass[ntrack];
for( int j=0; j<ntrack; j++ ) {
varr[j]= myclass();
cout << "Pointer to varr[" << j << "]: " << &(varr[j]) << endl;
}
cout << endl;
delete[] varr;
}
}
Run root:
persil:~/scratch> root
*******************************************
* *
* W E L C O M E to R O O T *
* *
* Version 2.00/07 20 May 1998 *
* *
* You are welcome to visit our Web site *
* http://root.cern.ch *
* *
*******************************************
CINT/ROOT C/C++ Interpreter version 5.13.55, May 16 1998
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] gSystem.Load("myclass.so");
root [1] #include <iostream.h>
root [2] .x bugdemo.cc
Pointer to varr[0]: 0x859044c
Pointer to varr[1]: 0x8590454
Pointer to varr[2]: 0x859045c
Pointer to varr[0]: 0x85990d0
*** Break *** segmentation violation
*** Break *** keyboard interrupt
Root >
root [3]
This is as far as I could simplify the problem I encountered in a much
larger application. Any help is greatly appreciated.
stefan
---Stefan Kluth---------------Lynen Fellow----------------|\--|\-------
- LBNL, MS 50A 2160 - phone: +1 510 495 2376 - |/ |/ -
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