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Create a new modifiable buffer that represents the given POD array.
template< typename PodType, std::size_t N> mutable_buffers_1 buffer( boost::array< PodType, N > & data, std::size_t max_size_in_bytes);
          A mutable_buffers_1
          value equivalent to:
        
mutable_buffers_1( data.data(), min(data.size() * sizeof(PodType), max_size_in_bytes));