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 += buf.size();
}