from django.contrib.auth.decorators import login_required

class LoginRequiredMixin(object):
    @classmethod
    def as_view(cls, **initkwargs):
        view = super(LoginRequiredMixin, cls).as_view(**initkwargs)
        return login_required(view)

class MyView(LoginRequiredMixin, ...):
    # this is a generic view
...

view = super(LoginRequiredMixin, cls).as_view(**initkwargs),