CFD Online Discussion Forums - How can I make my algorithm for finding duplicates more OpenFOAMic

Dear All,

I've coded the following algorithm to find duplicate entries in a List or Field of vectors.

I first concatenate the coordinates into a string, compute the hash of this string and then request the uniqueOrder of the container of hashes.

However I can't do this without std::string, std::to_string and std::hash. Any tips on how to do this using builtin OpenFOAM structures and functions?

Thanks in advance,

Victor

Code:

    List<label> pointBasedStencil::findUniquePoints(const Field<vector>& src)

    {

        // create hashes for entries in list using to_string

        List<label> hashlist;

        std::hash<std::string> hf;

        forAll(src,i) {

            std::string s(std::to_string(src[i].x() )

                           + std::to_string(src[i].y() )

                           + std::to_string(src[i].z() )

                            );

            hashlist.append(hf(s) );

        }



        // find unique indices

        List<label> order;

        uniqueOrder(hashlist, order);

        return order;

    }