Method operator[]

include/win/boost/multi_array/subarray.hpp:259–263

  const T* origin() const { return this->base_; }

  reference operator[](index idx) {
    return super_type::access(boost::type<reference>(),
                              idx,this->base_,this->shape(),this->strides(),
                              this->index_bases());
  }

  // see generate_array_view in base.hpp
  template <int NDims>