zl:1 - FTP

7 sys:%1d-aref
I
Current style suggests that you should use (Iocf (sys:%ld-aref ••• » instead
of sys:%ld-aloc.
When using sys:%ld-aloc it is necessary to understand how arrays are
stored in memory: See the section "Row-major Storage of Arrays" in Converting
to Genera 7.0.
For an example of accessing elements of a multidimensional array as if it
were a one-dimensional array: See the function sys:%ld-aref, page 7.
sys:%ld-aref array index Function
Returns the element of array selected by the index. sys:%ld-aref is the
same as aref, except that it ignores the number of dimensions of the array
and acts as if it were a one-dimensional array by linearizing the multidimensional
elements. copy-array-portion uses this function.
For example:
(setq *array* (make-array '(2B 3B 5B») => #
(setf (aref *array* 5 6 7) 'faa) => FOO
;;; The following three forms have the same effect.
(aref *array* 5 6 7) => FOO
(sys:%1d-aref *array* (+ (* (+ (* 5 3B) 6) 5B) 7» => FOO
(sys:%1d-aref *array* (array-row-major-index *array*» => FOO
When using sys:%ld-aref it is necessary to understand how arrays are
stored in memory: See the section "Row-major Storage of Arrays" in Converting
to Genera 7.0.
sys:%ld-aset value array index Function
Stores value into the element of array selected by the index. sys:%ld-aset
is the same as zl:aset, except that it ignores the number of dimensions of
the array and acts as if it were a one-dimensional array by linearizing the
multidimensional elements. copy-array-portion uses this function.
Current style suggests that you should use (setf (sys:%ld-aref ••• » instead
of sys:%ld-aset.
When using sys:%ld-aset it is necessary to understand how arrays are
stored in memory: See the section "Row-major Storage of Arrays" in Converting
to Genera 7.0.
For an example of accessing elements of a multidimensional array as if it
were a one-dimensional array: See the function sys:%ld-aref, page 7.