Deferred_Shape

 A deferred-shape array is an array pointer or an allocatable array.

 The array specification contains a colon (:) for each dimension of
 the array.  No bounds are specified.  The bounds (and shape) of
 allocatable arrays and array pointers are determined when space is
 allocated for the array during program execution.

 An array pointer is an array declared with the POINTER attribute.
 Its bounds and shape are determined when it is associated with a
 target by pointer assignment, or when the pointer is allocated by
 execution of an ALLOCATE statement.

 In pointer assignment, the lower bound of each dimension of the
 array pointer is the result of the LBOUND intrinsic function
 applied to the corresponding dimension of the target.  The upper
 bound of each dimension is the result of the UBOUND intrinsic
 function applied to the corresponding dimension of the target.

 A pointer dummy argument can be associated only with a pointer
 actual argument.  An actual argument that is a pointer can be
 associated with a nonpointer dummy argument.

 A function result can be declared to have the pointer attribute.

 An allocatable array is declared with the ALLOCATABLE attribute.
 Its bounds and shape are determined when the array is allocated by
 execution of an ALLOCATE statement.

 The following are examples of deferred-shape specifications:

   REAL, ALLOCATABLE :: A(:,:)       ! Allocatable array
   REAL, POINTER :: C(:), D (:,:,:)  ! Array pointers