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Get the size of the input sequence.

std::size_t size() const;
Return Value

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 += buffer_size(buf);