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

const mutable_buffer * buffer_sequence_begin(
    const mutable_buffer & b);
  » more...

const const_buffer * buffer_sequence_begin(
    const const_buffer & b);
  » more...

template<
    typename C>
auto buffer_sequence_begin(
    C & c);
  » more...

template<
    typename C>
auto buffer_sequence_begin(
    const C & c);
  » more...

Requirements

Header: boost/asio/buffer.hpp

Convenience header: boost/asio.hpp