76         struct deref<triple_iterator<Sq, 0> >  struct
78             typedef typename Sq::t0_type& type;
81             call(triple_iterator<Sq, 0> const& iter)  in call()
88         struct deref<triple_iterator<Sq, 0> const>  struct
90             typedef typename Sq::t0_type const& type;
93             call(triple_iterator<Sq, 0> const& iter)  in call()
100         struct deref<triple_iterator<Sq, 1> >  struct
102             typedef typename Sq::t1_type& type;
105             call(triple_iterator<Sq, 1> const& iter)  in call()
112         struct deref<triple_iterator<Sq, 1> const>  struct
114             typedef typename Sq::t1_type const& type;
117             call(triple_iterator<Sq, 1> const& iter)  in call()
124         struct deref<triple_iterator<Sq, 2> >  struct
126             typedef typename Sq::t2_type& type;
129             call(triple_iterator<Sq, 2> const& iter)  in call()
136         struct deref<triple_iterator<Sq, 2> const>  struct
138             typedef typename Sq::t2_type const& type;
141             call(triple_iterator<Sq, 2> const& iter)  in call()