[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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[Tobi]

Hi,

the object myCellSet is based on the class cellSet (https://cpp.openfoam.org/v6/classFoam_1_1cellSet.html). As you can see, there is no operator defined in that class that overloads/defines the operator[] operator. Additionally, you see the inherited functions (from inherited classes). While checking these functions, you can see that the operator[] is defined in the HashSet< label, Hash<label>> class. The operator will do the following:

bool operator[] (const label &) const
Return true if the entry exists, same as found() More...

That´s why you should either get true or false rather than what you expect to get.
Thanks for using code-tags.

[anon_q]

Thank you Tobi.
So

 myCellSet.sortedToc(i)

is the only way to retrive element with index i?

[Tobi]

Hi,
the function you recently added does not exist. This following would be correct

myObject.sortedToc()[i]

or

myObject.toc()[i]

However, just check the code (via Doxygen) to see what you can do. The method above will give you the entries inside the hash. However, if you have more entries, you should make sure you get the correct one. I would prefer to use a more convenient method for searching:

iterator 	find (const label &)
Find and return an iterator set at the hashedEntry. More...

, but out of the box, I cannot give you a suggestion.