[trailer]

Hello to all,

I would like to know if the following is possible:

If I create a tensorField:

volTensorField gradU = fvc::grad(U);        

tensorField gradU_Internal = gradU.internalField();

Is it possible to create a new vectorField with references to selective entries in the tensorField?

vectorField a = SomeFunctionToSelectTensorField(0,1,2);
vectorField b (gradU_Internal.size(), {3,3,3});
a += b; // should change the 0,1,2 entries in the tensorField.

Edit: To complement, a C++ example:

#include <vector>
#include <iostream>
using namespace std;

int main(int argc, char** argv)
{

    vector<double> a = {1,2,3,4,5};
    vector<std::reference_wrapper<double>> b ={a[0], a[1], a[2]};

    vector<double> c = {1,2,3};

    for(int i = 0; i < 3; i++)
    {
        b[i] += c[i];
    }

    cout << "Done" << endl;
   return(0);
}