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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(); }