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#### buffered_read_stream::fill

Fill the buffer with some data. Returns the number of bytes placed in the buffer as a result of the operation. Throws an exception on failure.

    std::size_t fill();

Fill the buffer with some data. Returns the number of bytes placed in the buffer as a result of the operation, or 0 if an error occurred.

    std::size_t fill(
        boost::system::error_code & ec);