Lahey/GNU Fortran

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8.14 ALLOCATED — Status of an allocatable entity

Description:
ALLOCATED(ARRAY) and ALLOCATED(SCALAR) check the allocation status of ARRAY and SCALAR, respectively.
Standard:
Fortran 95 and later. Note, the SCALAR= keyword and allocatable scalar entities are available in Fortran 2003 and later.
Class:
Inquiry function
Syntax:

RESULT = ALLOCATED(ARRAY)
RESULT = ALLOCATED(SCALAR)

Arguments:

ARRAY The argument shall be an ALLOCATABLE array.
SCALAR The argument shall be an ALLOCATABLE scalar.

Return value:
The return value is a scalar LOGICAL with the default logical kind type parameter. If the argument is allocated, then the result is .TRUE.; otherwise, it returns .FALSE.
Example:
          program test_allocated
            integer :: i = 4
            real(4), allocatable :: x(:)
            if (.not. allocated(x)) allocate(x(i))
          end program test_allocated