As discussed in Section 5.4, SIDL supports both normal and raw arrays (i.e., r-arrays). Normal SIDL arrays can be used by any supported language; whereas, r-arrays are restricted to numeric types and use in languages such as C, C++, and Fortran. This subsection starts with a discussion normal and generic arrays before proceeding with an example of the interfaces for r-arrays.
The normal SIDL array API is available in a module for creating,
destroying, and accessing array elements and meta-data for normal arrays.
More information on the API can be found in
Subsection 5.4.
For sidl.SIDLException, the array module -- called
sidl_SIDLException_array -- is defined in
sidl_SIDLException_array.F90.
The derived type for a SIDL array is named after the class,
interface, or basic type that it holds and the dimension of the
array. For sidl.SIDLException, the array derived types are
named sidl_SIDLException_1d,
sidl_SIDLException_2d,
sidl_SIDLException_3d,
up to
sidl_SIDLException_7d. For basic types, they
are treated as sidl.dcomplex, sidl.double,
sidl.fcomplex, etc. Each of these derived types has a
64-bit integer to hold an opaque pointer.
NOTE
Normal Fortran 90 arrays or normal SIDL arrays can be used when
calling a Fortran 90 method, but they cannot be mixed.
Derived types for SIDL types dcomplex, double, fcomplex,
float, int, and long have pointers to arrays of the
appropriate type and dimension that facilitate direct access to array elements.
For example, the derived type for 2d and 3d arrays of doubles is
use sidl
type sidl_double_2d
sequence
integer (kind=sidl_arrayptr) :: d_array
real (kind=sidl_double), pointer, &
dimension(:,:) :: d_data
end type sidl_double_2d
type sidl_double_3d
sequence
integer (kind=sidl_arrayptr) :: d_array
real (kind=sidl_double), pointer, &
dimension(:,:,:) :: d_data
end type sidl_double_3d
For the other types, the array API must be used to access elements. In this case, the array can be accessed with the F90 array pointer d_data just like any other F90 array. However, the F90 built-in methods allocate or deallocate on d_data must not be used. Instead, SIDL functions, createCol, createRow, create1d, create2dRow, or create2dCol, must be used to create a new array. These SIDL routines initialize d_data to refer to the data allocated in d_array.
NOTE
create1d,
create2dRow, and create2dCol create arrays whose lower
index is 0 not 1. To create arrays with a lower index of 1,
createCol or createRow must be used.
Software packages like LINPACK or BLAS can be called, but the stride should be checked to make sure the array is suitably packed. Using stride(i) will provide the distance between elements in dimension i. A value of 1 means elements are packed densely. Negative stride values are possible and, when an array is sliced, the resulting array might not even have one densely packed dimension.
As discussed in Section 5.4, the type of a generic
array is not specified.
As a result, Fortran 90 represents generic arrays as the derived type
sidl__array as defined in the
sidl_array_type module.
(Note the use of a two underscore separator.) The following subroutines,
defined in the sidl_array_array module, apply to
generic arrays
addRef,
deleteRef,
dimen, type,
isColumnOrder,
isRowOrder,
is_null,
no_null,
set_null,
lower,
upper,
length,
stride, and
smartCopy.
Finally, SIDL r-arrays are passed
to and from methods as normal Fortran 90 arrays.
Index variables do not need to be included because the
values are determined from the Fortran 90 array extents in each
dimension. For example,
the client-side interface for solve -- introduced in
Section 5.4 -- behaves as if it is a Fortran 90 function
with the following overloaded interface
private :: solve_1s, solve_2s
interface solve
module procedure solve_1s, solve_2s
end interface
recursive subroutine solve_1s(self, A, x, exception)
implicit none
! in num.Linsol self
type(num_Linsol_t) , intent(in) :: self
! in array<double,2,column-major> A
type(sidl_double_2d) , intent(in) :: A
! inout array<double,column-major> x
type(sidl_double_1d) , intent(inout) :: x
! out sidl.BaseInterface exception
type(sidl_BaseInterface_t) , intent(out) :: exception
end subroutine solve_1s
recursive subroutine solve_2s(self, A, x, exception)
implicit none
! in num.Linsol self
type(num_Linsol_t) , intent(in) :: self
! in rarray<double,2> A(m,n)
real (kind=sidl_double) , intent(in), dimension(:, :) :: A
! inout rarray<double> x(n)
real (kind=sidl_double) , intent(inout), dimension(:) :: x
! out sidl.BaseInterface exception
type(sidl_BaseInterface_t) , intent(out) :: exception
! in int m
integer (kind=sidl_int) :: m
! in int n
integer (kind=sidl_int) :: n
end subroutine solve_2s
The server-side interface, shown below, is similar.
recursive subroutine num_Linsol_solve_mi(self, A, x, m, n, exception)
use sidl
use sidl_BaseInterface
use sidl_RuntimeException
use num_Linsol
use sidl_double_array
use num_Linsol_impl
! DO-NOT-DELETE splicer.begin(num.Linsol.solve.use)
! Insert-Code-Here {num.Linsol.solve.use} (use statements)
! DO-NOT-DELETE splicer.end(num.Linsol.solve.use)
implicit none
type(num_Linsol_t) :: self ! in
integer (kind=sidl_int) :: m ! in
integer (kind=sidl_int) :: n ! in
type(sidl_BaseInterface_t) :: exception ! out
real (kind=sidl_double), dimension(0:m-1, 0:n-1) :: A ! in
real (kind=sidl_double), dimension(0:n-1) :: x ! inout
! DO-NOT-DELETE splicer.begin(num.Linsol.solve)
! Insert-Code-Here {num.Linsol.solve} (solve method)
! DO-NOT-DELETE splicer.end(num.Linsol.solve)
end subroutine num_Linsol_solve_mi
NOTE
The lower
index of each dimension of every incoming array is always zero.