entity.f90

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module entity
  implicit none
  private
 
  type, public, abstract :: entity_t
     integer, private :: id_ = -1
   contains
     procedure, pass(this) :: id => entity_id
     procedure, pass(this) :: set_id => entity_set_id
  end type entity_t
 
contains
 
  pure function entity_id(this) result(id)
    class(entity_t), intent(in) :: this
    integer :: id
    id = this%id_
  end function entity_id
 
  subroutine entity_set_id(this, id)
    class(entity_t), intent(inout) :: this
    integer, intent(in) :: id
    this%id_ = id
  end subroutine entity_set_id
 
end module entity