memory leaks - Does deallocating a Fortran derived type automatically deallocate member arrays and pointers as well?

Question

In Fortran, if I have an allocatable array of derived types, each consisting of a pointer and an allocatable array,

type group
  real, pointer :: object
  real, allocatable :: objectData(:,:)
end type group

type(group), allocatable :: myGroup(:)

would I be able to deallocate all memory contained in this type by simply making a single call

deallocate(myGroup)

or do I need to deallocate the arrays within each type first, before deallocating the derived type:

do i = 1, size(myGroup)
  nullify(myGroup(i)%object)
  deallocate(myGroup(i)%objectData)
end do

deallocate(myGroup)

I'm leaning towards option 2 and nullifying all memory before deallocating the derived type, if not just to ensure that memory leaks aren't happening, but if option 1 is equivalent then that would be useful for future reference and save me a few lines of code.

Answer 1

Only allocatable components are automatically deallocated. You must deallocate pointers yourself.

Be careful, you have to deallocate the pointer, not just nullify. Nullifying it just removes the reference to the allocated memory. If you do not deallocate, a memory leak will happen.