[anon_q]

In my code, I can add cell IDs to a cellSet

cellSet myCellSet
(
   IOobject
    (

    "myCellSet",
    runTime.timeName(),
    runTime,
    IOobject::MUST_READ,
    IOobject::AUTO_WRITE

    )

);
myCellSet.clear();

const volVectorField& C = mesh.C();
const vector origin(0.0,0.0,0.0);

forAll(C, i)
{
      if((mag(C[i] - origin) < 0.6) && (mag(C[i] - origin) > 0.5) )
      {
           myCellSet.insert(i);

      }

}

The problem is that I cannot retrieve elements from the cellSet (I mean it is obvious to use the following syntax to get the first element: myCellSet[0], but this gives something irrelevant. As far as I know I use only the following syntax (exmple to retrieve the first element):

Info << myCellSet.sortedToc()[0] << endl;

Can you please tell me what is the correct way to retrieve elements from a cellSet.
NOTE: The code works very well and the myCellSet is written to the directories (the remaining code is not shown here).

In summary the question is very simple:
Why the following syntax doesn't give the expected result:

myCellSet[0]

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