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Get the size of the input sequence.
std::size_t size() const;
          The size of the input sequence. The value is equal to that calculated for
          s in the following code:
        
size_t s = 0;
const_buffers_type bufs = data();
const_buffers_type::const_iterator i = bufs.begin();
while (i != bufs.end())
{
  const_buffer buf(*i++);
  s += buf.size();
}