The main documentation of the Get_Version_Overlapped_Vector Procedure contains additional explanation of this code listing.
function Get_Version_Overlapped_Vector (OV) result(Version) ! Input variable. type(Overlapped_Vector_type), intent(in) :: OV ! Variable to be queried. ! Output variable. type(integer) :: Version ! Version number. !~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ! Verify requirements. VERIFY(Valid_State(OV),5) ! OV is valid. ! Get the value. Version = OV%Version ! Verify guarantees - none. return end function Get_Version_Overlapped_Vector