strings_column_view.hpp

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/*
 * Copyright (c) 2019-2024, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://apache.ac.cn/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include <cudf/column/column_view.hpp>
#include <cudf/utilities/default_stream.hpp>
#include <cudf/utilities/export.hpp>

namespace CUDF_EXPORT cudf {

class strings_column_view : private column_view {
 public
 strings_column_view(column_view strings_column);
 strings_column_view(strings_column_view&&) = default;
 strings_column_view(strings_column_view const&) = default;
 ~strings_column_view() override = default;
 strings_column_view& operator=(strings_column_view const&) = default;
 strings_column_view& operator=(strings_column_view&&) = default;

 static constexpr size_type offsets_column_index{0};

 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*;
 using chars_iterator = char const*;

 [[nodiscard]] column_view parent() const;

 [[nodiscard]] column_view offsets() const;

 [[nodiscard]] int64_t chars_size(rmm::cuda_stream_view stream) const noexcept;

 [[nodiscard]] chars_iterator chars_begin(rmm::cuda_stream_view) const;

 [[nodiscard]] chars_iterator chars_end(rmm::cuda_stream_view stream) const;
};

namespace strings {
} // namespace strings
 // 组结束
} // namespace CUDF_EXPORT cudf