pointer_view_a Function

private function pointer_view_a(new_area, area, offset, len) result(narea2)

Repoints a pointer into a part of a data area

Arguments

Type IntentOptional Attributes Name
type(dbcsr_data_obj), intent(inout) :: new_area

repoints this encapsulated pointer
type(dbcsr_data_obj), intent(in) :: area

area to point into
integer, intent(in) :: offset

point to this offset in area
integer, intent(in), optional :: len

length of data area to point to

Return Value type(dbcsr_data_obj)

copy of new_area


Contents

Source Code

pointer_view_a

Source Code

   FUNCTION pointer_view_a(new_area, area, offset, len) RESULT(narea2)
      !! Repoints a pointer into a part of a data area

      TYPE(dbcsr_data_obj), INTENT(INOUT)                :: new_area
         !! repoints this encapsulated pointer
      TYPE(dbcsr_data_obj), INTENT(IN)                   :: area
         !! area to point into
      INTEGER, INTENT(IN)                                :: offset
         !! point to this offset in area
      INTEGER, INTENT(IN), OPTIONAL                      :: len
         !! length of data area to point to
      TYPE(dbcsr_data_obj)                               :: narea2
         !! copy of new_area

      IF (area%d%data_type /= new_area%d%data_type) &
         DBCSR_ABORT("Incompatible data types.")
      IF (PRESENT(len)) THEN
         SELECT CASE (area%d%data_type)
         CASE (dbcsr_type_real_4)
            new_area%d%r_sp => area%d%r_sp(offset:offset + len - 1)
         CASE (dbcsr_type_real_8)
            new_area%d%r_dp => area%d%r_dp(offset:offset + len - 1)
         CASE (dbcsr_type_complex_4)
            new_area%d%c_sp => area%d%c_sp(offset:offset + len - 1)
         CASE (dbcsr_type_complex_8)
            new_area%d%c_dp => area%d%c_dp(offset:offset + len - 1)
         CASE default
            DBCSR_ABORT("Invalid data type.")
         END SELECT
      ELSE
         SELECT CASE (area%d%data_type)
         CASE (dbcsr_type_real_4)
            new_area%d%r_sp => area%d%r_sp(offset:)
         CASE (dbcsr_type_real_8)
            new_area%d%r_dp => area%d%r_dp(offset:)
         CASE (dbcsr_type_complex_4)
            new_area%d%c_sp => area%d%c_sp(offset:)
         CASE (dbcsr_type_complex_8)
            new_area%d%c_dp => area%d%c_dp(offset:)
         CASE default
            DBCSR_ABORT("Invalid data type.")
         END SELECT
      END IF
      narea2 = new_area
   END FUNCTION pointer_view_a