Function buffer_sequence_begin

3rd/asio-1.24.0/include/asio/buffer.hpp:389–395

/// Get an iterator to the first element in a buffer sequence.
template <typename MutableBuffer>
inline const mutable_buffer* buffer_sequence_begin(const MutableBuffer& b,
    typename constraint<
      is_convertible<const MutableBuffer*, const mutable_buffer*>::value
    >::type = 0) ASIO_NOEXCEPT
{
  return static_cast<const mutable_buffer*>(detail::addressof(b));
}

/// Get an iterator to the first element in a buffer sequence.
template <typename ConstBuffer>