text: /*
   * Copyright (c) 2019, 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
   *
   *     http://www.apache.org/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/types.hpp>
  
  #include <vector>
  
  namespace cudf {
  
  namespace detail {
  
  /**
   * @copydoc cudf::segmented_count_set_bits
   *
   * @param[in] stream Optional CUDA stream on which to execute kernels
   */
  std::vector<size_type>
  segmented_count_set_bits(bitmask_type const* bitmask,
                           std::vector<size_type> const& indices,
                           cudaStream_t stream = 0);
  
  /**
   * @copydoc cudf::segmented_count_unset_bits
   *
   * @param[in] stream Optional CUDA stream on which to execute kernels
   */
  std::vector<size_type>
  segmented_count_unset_bits(bitmask_type const* bitmask,
                             std::vector<size_type> const& indices,
                             cudaStream_t stream = 0);
  
  /**---------------------------------------------------------------------------*
   * @brief Concatenates `views[i]`'s bitmask from the bits
   * `[views[i].offset(), views[i].offset() + views[i].size())` for all elements
   * views[i] in views into an array
   *
   * @param views Vector of column views whose bitmask needs to be copied
   * @param dest_mask Pointer to array that contains the combined bitmask
   * of the column views
   * @param stream stream on which all memory allocations and copies
   * will be performed
   *---------------------------------------------------------------------------**/
  void concatenate_masks(std::vector<column_view> const &views,
      bitmask_type * dest_mask,
      cudaStream_t stream);
  }  // namespace detail
  
  }  // namespace cudf
  