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If you don't want to use std::vector here, you can use std::array instead, not C-style arrays.
And no, std::vector is not 'much more heavier'. It depends on how you use it (i.e. if you do a lot of reallocations). In my code, there is only one allocation since I provide the size at the initialization.
Why did you use "auto"? What's it means?
I thought it was used to declare local variables, is it another use?
std::array can not be used here because the size of an std::array must be provided at compile time.