ALLOCATED — Status of an allocatable entity¶

ALLOCATED(ARRAY)¶

ALLOCATED(ARRAY) and ALLOCATED(SCALAR) check the allocation status of ARRAY and SCALAR, respectively.

Parameters

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

Returns

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.

Standard:: Fortran 90 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)

Example:

program test_allocated
  integer :: i = 4
  real(4), allocatable :: x(:)
  if (.not. allocated(x)) allocate(x(i))
end program test_allocated