init_singleWeight Function

    elemental function init_singleWeight(csf_i, sOrb) result(singleWeight)
        type(CSF_Info_t), intent(in) :: csf_i
        integer, intent(in) :: sOrb
        type(WeightObj_t) :: singleWeight
        character(*), parameter :: this_routine = "init_singleWeight"

        ASSERT(sOrb > 0 .and. sOrb <= nSpatOrbs)

        singleWeight%dat%F = endFx(csf_i, sOrb)
        singleWeight%dat%G = endGx(csf_i, sOrb)

        singleWeight%proc%minus => getMinus_single
        singleWeight%proc%plus => getPlus_single

        singleWeight%initialized = .true.

    end function init_singleWeight