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program optional_08
implicit none
type :: base
character(len=:), allocatable :: working_dir
end type base
class(base), allocatable :: obj
character(len=:), allocatable :: working_dir
! ---------------------------
! Initial setup
! ---------------------------
working_dir = "Hello"
if (.not. allocated(working_dir)) then
error stop "ERROR: working_dir not allocated after assignment"
end if
! ---------------------------
! Get command-line settings
! ---------------------------
call get_command_line_settings(obj)
if (.not. allocated(obj)) then
error stop "ERROR: obj not allocated by get_command_line_settings"
end if
! ---------------------------
! Extract working directory
! ---------------------------
call get_working_dir(obj, working_dir)
if (.not. allocated(working_dir)) then
error stop "ERROR: working_dir not allocated after get_working_dir"
end if
print *, "SUCCESS"
print *, "working_dir =", trim(working_dir)
contains
subroutine get_working_dir(settings, working_dir_)
class(base), optional, intent(in) :: settings
character(len=:), allocatable, intent(out) :: working_dir_
! Validate presence
if (.not. present(settings)) then
error stop "ERROR: settings not present in get_working_dir"
end if
! Validate allocation of component
if (.not. allocated(settings%working_dir)) then
error stop "ERROR: settings%working_dir not allocated"
end if
! Safe assignment (auto-allocates working_dir_)
working_dir_ = settings%working_dir
end subroutine get_working_dir
subroutine get_command_line_settings(cmd_settings)
class(base), allocatable, intent(out) :: cmd_settings
allocate(cmd_settings)
if (.not. allocated(cmd_settings)) then
error stop "ERROR: failed to allocate cmd_settings"
end if
! Initialize component explicitly
cmd_settings%working_dir = "Hello"
if (.not. allocated(cmd_settings%working_dir)) then
error stop "ERROR: cmd_settings%working_dir not allocated"
end if
end subroutine get_command_line_settings
end program
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