#### dynamic_vector_buffer::data

DynamicBuffer_v1: Get a list of buffers that represents the input sequence.

    const_buffers_type data() const;
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DynamicBuffer_v2: Get a sequence of buffers that represents the underlying memory.

    mutable_buffers_type data(
        std::size_t pos,
        std::size_t n);
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    const_buffers_type data(
        std::size_t pos,
        std::size_t n) const;
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