Intel® Fortran Compiler 17.0 Developer Guide and Reference
Statement and Attribute: Specifies that an object can become the target of a pointer (it can be pointed to).
The TARGET attribute can be specified in a type declaration statement or a TARGET statement, and takes one of the following forms:
Type Declaration Statement:
type,[att-ls,] TARGET [, att-ls] :: object [(a-spec)] [[coarray-spec]] [, object[(a-spec)] [[coarray-spec]]]...
Statement:
TARGET [::] object [(a-spec)] [[coarray-spec]] [, object[(a-spec)]] [[coarray-spec]]...
type |
Is a data type specifier. |
att-ls |
Is an optional list of attribute specifiers. |
object |
Is the name of the object. The object must not be declared with the PARAMETER attribute. |
a-spec |
(Optional) Is an array specification or a coarray specification. |
coarray-spec |
(Optional) Is a deferred-coshape specification. The left bracket and right bracket are required. |
A pointer is associated with a target by pointer assignment or by an ALLOCATE statement.
If an object does not have the TARGET attribute or has not been allocated (using an ALLOCATE statement), no part of it can be accessed by a pointer.
The following example shows type declaration statements specifying the TARGET attribute:
TYPE(SYSTEM), TARGET :: FIRST
REAL, DIMENSION(20, 20), TARGET :: C, DThe following is an example of a TARGET statement:
TARGET :: C(50, 50), DThe following fragment is from the program POINTER2.F90 in the <install-dir>/samples subdirectory:
! An example of pointer assignment.
REAL, POINTER :: arrow1 (:)
REAL, POINTER :: arrow2 (:)
REAL, ALLOCATABLE, TARGET :: bullseye (:)
ALLOCATE (bullseye (7))
bullseye = 1.
bullseye (1:7:2) = 10.
WRITE (*,'(/1x,a,7f8.0)') 'target ',bullseye
arrow1 => bullseye
WRITE (*,'(/1x,a,7f8.0)') 'pointer',arrow1
. . .