Assigning values to array of pointers in Fortran -


i assign values array of pointers in fortran 2003. array of pointers realised means of derived data type arrpntr. please take @ simple example below:

  program tst_pntr    real, allocatable, target  :: arr1(:), arr2(:)    ! array of pointers   type :: arrpntr     real, pointer :: arr(:) => null()   end type    type(arrpntr) :: p(2)    integer :: err    integer, parameter :: m = 10, n = 10    allocate(arr1(m), arr2(n), stat=err)    arr1 = [ (i, i=1, 10) ]   arr2 = arr1**2    ! arr1 = arr1-0.5   ! p(1)%arr => arr1    p(1)%arr => arr1-0.5   p(2)%arr => arr2    write(*,*) p(1)%arr   write(*,*) p(2)%arr    arr1 = arr1**2   arr2 = sqrt(arr2)    write(*,*) p(1)%arr   write(*,*) p(2)%arr    deallocate(arr1, arr2, stat=err)    nullify(p(1)%arr, p(2)%arr)    end program tst_pntr

in current state compiler throws error: pointer assignment target neither target nor pointer @ (1) complaining line p(1)%arr => arr1-0.5. works in case split operation 2 parts in commented lines above. however, achieve same result without storing intermediate result in temporary variable arr1. operation arr1-0.5 simple example. in reality use more complex expression on right hand side of p(1)%arr =>. there better way avoiding use of intermediate array?


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