Method reset

include/boost/histogram/storage/array_storage.hpp:63–69

  allocator_type get_allocator() const { return array_.get_allocator(); }

  void reset(std::size_t s) {
    if (s == size()) {
      std::fill(array_.begin(), array_.end(), element_type(0));
    } else {
      array_ = array_type(s, element_type(0), array_.get_allocator());
    }
  }

  std::size_t size() const noexcept { return array_.size(); }