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Get the total number of bytes in a buffer sequence.
template<
    typename BufferSequence>
std::size_t buffer_size(
    const BufferSequence & b);
        The buffer_size function determines the total size of all buffers
        in the buffer sequence, as if computed as follows:
      
size_t total_size = 0;
auto i = boost::asio::buffer_sequence_begin(buffers);
auto end = boost::asio::buffer_sequence_end(buffers);
for (; i != end; ++i)
{
  const_buffer b(*i);
  total_size += b.size();
}
return total_size;
        The BufferSequence template parameter may meet either of the
        ConstBufferSequence or MutableBufferSequence type
        requirements.
      
        Header: boost/asio/buffer.hpp
      
        Convenience header: boost/asio.hpp