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Create a new modifiable buffer that represents the given POD vector.
template< typename PodType, typename Allocator> mutable_buffer buffer( std::vector< PodType, Allocator > & data, std::size_t max_size_in_bytes);
          A mutable_buffer
          value equivalent to:
        
mutable_buffer( data.size() ? &data[0] : 0, min(data.size() * sizeof(PodType), max_size_in_bytes));
The buffer is invalidated by any vector operation that would also invalidate iterators.