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There was some effort toward getting it in Boost. https://github.com/ndarray/Boost.NumPy

Arrayfire is c++ with Opencl, cuda, and cpu back ends. Limited to 4d. http://arrayfire.com/indexing-with-arrayfire/

Here is my Blitz++-inspired hobby project, supports arbitrary rank: https://github.com/lloda/ra-ra

I'm sure you can find more polished efforts if you look around.

If you want multidimensional arrays in C++, then blitz++ is your friend.

There is Eigen but it wont do multidimensional stuff. Although there might be a few projects out there that wrap the multidimensional functionality around Eigen arrays.

One such multidimensional extension of Eigen is from Google and I believe was extracted from TensorFlow:

https://bitbucket.org/eigen/eigen/src/039efd86b75ce1b72befb7...

You might want to check out the Eigen library: http://eigen.tuxfamily.org/

Also something like this but for .NET?