pointer to pointer in fortran 2

[harphool]

type :: row1
real*8, dimension), pointer :: A
end type row1
type :: row2
type(row1), dimension), pointer :: B
end type row2
type(row2), dimension), pointer :: C

Do I need to fee this memory?
is nullify(C) enough?

 

[xwb]

Is this F90 or a later version? As of F95, arrays deallocate themselves when they go out of scope.

 

[FJacq]

Fortran deallocates automatically only allocatable objects, not pointers. So, if C has been allocated, then nullify(C) is not enough. You must first deallocate each sub-pointer (if allocated) and then deallocate C at the end of the process to free the memory.

@harphool it is usually better to allocate only allocatable objects even if pointer objects may be allocated too. I prefer to use pointers only to point to a memory already allocated.

François Jacq

 

[harphool]

thanks François Jacq and
xwb