The asio::buffer_sequence_begin function returns an iterator pointing to the first element in a buffer sequence.

Get an iterator to the first element in a buffer sequence.

const mutable_buffer * buffer_sequence_begin(
    const mutable_buffer & b);
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const const_buffer * buffer_sequence_begin(
    const const_buffer & b);
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template<
    typename C>
auto buffer_sequence_begin(
    C & c);
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template<
    typename C>
auto buffer_sequence_begin(
    const C & c);
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Requirements

Header: asio/buffer.hpp

Convenience header: asio.hpp