ASSOCIATED — Status of a pointer or pointer/target pair#
-
ASSOCIATED(POINTER, TARGET)#
ASSOCIATED(POINTER [, TARGET])
determines the status of the pointerPOINTER
or ifPOINTER
is associated with the targetTARGET
.- Parameters
POINTER –
POINTER
shall have thePOINTER
attribute and it can be of any type.TARGET – (Optional)
TARGET
shall be a pointer or a target. It must have the same type, kind type parameter, and array rank asPOINTER
.
- Returns
ASSOCIATED(POINTER)
returns a scalar value of typeLOGICAL(4)
. There are several cases:When the optional TARGET is not present then ASSOCIATED(POINTER) is true if POINTER is associated with a target; otherwise, it returns false.
If TARGET is present and a scalar target, the result is true if TARGET is not a zero-sized storage sequence and the target associated with POINTER occupies the same storage units. If POINTER is disassociated, the result is false.
If TARGET is present and an array target, the result is true if TARGET and POINTER have the same shape, are not zero-sized arrays, are arrays whose elements are not zero-sized storage sequences, and TARGET and POINTER occupy the same storage units in array element order. As in case(B), the result is false, if POINTER is disassociated.
If TARGET is present and an scalar pointer, the result is true if TARGET is associated with POINTER, the target associated with TARGET are not zero-sized storage sequences and occupy the same storage units. The result is false, if either TARGET or POINTER is disassociated.
If TARGET is present and an array pointer, the result is true if target associated with POINTER and the target associated with TARGET have the same shape, are not zero-sized arrays, are arrays whose elements are not zero-sized storage sequences, and TARGET and POINTER occupy the same storage units in array element order. The result is false, if either TARGET or POINTER is disassociated.
- Standard:
Fortran 90 and later
- Class:
Inquiry function
- Syntax:
RESULT = ASSOCIATED(POINTER [, TARGET])
- Example:
program test_associated implicit none real, target :: tgt(2) = (/1., 2./) real, pointer :: ptr(:) ptr => tgt if (associated(ptr) .eqv. .false.) call abort if (associated(ptr,tgt) .eqv. .false.) call abort end program test_associated
- See also: