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#### basic_streambuf::size

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);
    }