Cool! I knew it was being worked on; I look it up every few months but keep forgetting the name. RFC 2000 const generics. Any talk yet of a standard ndarray type once that lands? C++ doesn't have one and numeric library compatibility really suffers. Python has one (the buffer interface basically blessed numpy arrays). At our shop python is our glue language mainly because you can pass data between libraries and expect it to work and work efficiently (without unnecessary copies).