Function Bitmap

cpp/src/arrow/util/bitmap.h:54–59

  Bitmap() = default;

  Bitmap(const std::shared_ptr<Buffer>& buffer, int64_t offset, int64_t length)
      : data_(buffer->data()), offset_(offset), length_(length) {
    if (buffer->is_mutable()) {
      mutable_data_ = buffer->mutable_data();
    }
  }

  Bitmap(const void* data, int64_t offset, int64_t length)
      : data_(reinterpret_cast<const uint8_t*>(data)), offset_(offset), length_(length) {}