static std::ptrdiff_t size2( const Id& id ) { return id.size2(); }
static std::ptrdiff_t size2( const Id& t ) { return t.size2(); }
static typename result_of::end_value< adapted_type >::type end_value( Id& id ) { return bindings::begin_value( id.data() ) + offset( id.data(), id.start1() + id.size1(), id.start2() + id.size2() ); }