void xt_quicksort_xt_int_permutation(Xt_int a[], size_t n, int permutation[])
void xt_quicksort_int(int a[], size_t n)
void xt_quicksort_index(Xt_int a[], int n, int *idx, int reset_index)
void xt_quicksort_int_permutation(int a[], size_t n, int permutation[])
void xt_quicksort_idxpos(idxpos_type v[], size_t n)