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