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.

template<
    typename MutableBuffer>
const mutable_buffer * buffer_sequence_begin(
    const MutableBuffer & b,
    typename enable_if< is_convertible< const MutableBuffer *, const mutable_buffer * >::value >::type *  = 0);
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template<
    typename ConstBuffer>
const const_buffer * buffer_sequence_begin(
    const ConstBuffer & b,
    typename enable_if< is_convertible< const ConstBuffer *, const const_buffer * >::value >::type *  = 0);
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template<
    typename C>
auto buffer_sequence_begin(
    C & c,
    typename enable_if< !is_convertible< const C *, const mutable_buffer * >::value &&!is_convertible< const C *, const const_buffer * >::value >::type *  = 0);
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template<
    typename C>
auto buffer_sequence_begin(
    const C & c,
    typename enable_if< !is_convertible< const C *, const mutable_buffer * >::value &&!is_convertible< const C *, const const_buffer * >::value >::type *  = 0);
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Requirements

Header: asio/buffer.hpp

Convenience header: asio.hpp