TVector3 array as function parameter problem

ROOT
#1

I have created a TVector3 array, and I want to use it as a function parameter like below. But I find I can only get the first TVector, position[0][0]. How to solve this?

TVector3 position[14][22];
   for(short i=0; i<14; i++)
	    {
		for(short j=0; j<22; j++)
		{
			position[i][j].SetX(1);
		}
	    }
void CalcCoG(TVector3 position[][22])
{
   for(short i=0; i<14; i++)
	    {
		for(short j=0; j<22; j++)
		{
			cout<<"position"<<"["<<i<<"]"<<"["<<j<<"]"<<" x:"<<position[i][j].X()<<endl;
		}
	    }
}

The result shows only position[0][0].X() gets 1, others get 0 or a very small number.

#2

Hi,

this will get you started.
With ROOT6 and in general starting from C++11 manipulation and spelling of types is easy. here we do not even write the name of the type in the signature!

#include "TVector3.h"
#include <iostream>
#include <typeinfo>
using namespace std;

TVector3 position[14][22];

void CalcCoG(decltype(position)& position)
{
   for (short i = 0; i < 14; i++) {
      for (short j = 0; j < 22; j++) {
         cout << "position" << "[" << i << "]" << "[" << j << "]" << " x:" << position[i][j].X() << endl;
      }
   }
}

int main()
{
   for (short i = 0; i < 14; i++) {
      for (short j = 0; j < 22; j++) {
         position[i][j].SetX(i*j);
      }
   }

   CalcCoG(position);

   cout << "The type name is " << typeid(position).name() << endl;

}

This would be the C++98 version.

#include "TVector3.h"
#include <iostream>
#include <typeinfo>
using namespace std;

TVector3 position[14][22];

void CalcCoG(TVector3 (*position)[22])
{
   for (short i = 0; i < 14; i++) {
      for (short j = 0; j < 22; j++) {
         cout << "position" << "[" << i << "]" << "[" << j << "]" << " x:" << position[i][j].X() << endl;
      }
   }
}

int main()
{
   for (short i = 0; i < 14; i++) {
      for (short j = 0; j < 22; j++) {
         position[i][j].SetX(i*j);
      }
   }

   CalcCoG(position);

   cout << "The type name is " << typeid(position).name() << endl;

}