How to pass a double pointer as an argument and return it from the C ++ function

I have a function that requires it to be void and that a double pointer is returned from it by the argument.

void cracking::decompose(char input[][100], int size_S, double* &Atm, int* &ID, int &size_out);
{
vector<double> AtmD;
vector<int> XsD;
...


    Atm = &AtmD[0];
    ID = &XsD[0];
    size_out = size(AtmD);

}

On Main it stays:

int main()
{
    char oi[900][100] = { "1  0.5 C", "2  0.55 N", "3  .5  S" };
    double* xAtm = NULL;
    int* xXs = NULL;
    int tamanho;
    cracking calc;


    calc.decompose(oi, 3, xAtm, xXs, tamanho);



    return 0;
}

Although compiling it returns me completely wrong values. Is there any way to do this with the pointers?

In fact I realized that the pointers inside my function turn into junk when I return them to the main. Is there any way to keep pointers saved? For example, if I save the address 0x000000000029d680 in memory and it corresponds to 23.5, when I leave the function this address no longer corresponds to that value and turns to garbage, is there a way to keep this value?