lists_column_view.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2020-2024, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <cudf/column/column.hpp>
#include <cudf/column/column_view.hpp>
#include <cudf/utilities/export.hpp>
 
#include <rmm/cuda_stream_view.hpp>
 
namespace CUDF_EXPORT cudf {
 
class lists_column_view : private column_view {
 public:
  lists_column_view() = default;
  lists_column_view(column_view const& lists_column);
  lists_column_view(lists_column_view&&)      = default;  
  lists_column_view(lists_column_view const&) = default;  
  ~lists_column_view() override               = default;
  lists_column_view& operator=(lists_column_view const&) = default;
  lists_column_view& operator=(lists_column_view&&) = default;
 
  static constexpr size_type offsets_column_index{0};  
  static constexpr size_type child_column_index{1};    
 
  using column_view::child_begin;
  using column_view::child_end;
  using column_view::has_nulls;
  using column_view::is_empty;
  using column_view::null_count;
  using column_view::null_mask;
  using column_view::offset;
  using column_view::size;
  using offset_iterator = size_type const*;  
 
  [[nodiscard]] column_view parent() const;
 
  [[nodiscard]] column_view offsets() const;
 
  [[nodiscard]] column_view child() const;
 
  [[nodiscard]] column_view get_sliced_child(rmm::cuda_stream_view stream) const;
 
  [[nodiscard]] offset_iterator offsets_begin() const noexcept
  {
    return offsets().begin<size_type>() + offset();
  }
 
  [[nodiscard]] offset_iterator offsets_end() const noexcept
  {
    return offsets_begin() + size() + 1;
  }
};  // end of group
}  // namespace CUDF_EXPORT cudf