In his C++ Core Guidelines, Bjarne Stroustrup recommends using span when passing arrays by reference. Why not just pass a std::array object?
What's the difference between passing span<T> and std::array as arguments?
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Passing
std::arrayby value would be copying them. The point ofgsl::spanis that the function taking them is referencing an existing array of data.gsl::spanis capable of taking arrays of runtime-defined sizes.std::arrayis fixed at compile-time.gsl::spandoes not care what type owns the array; it's just a pointer+size. So aspan-based interface can be fed data fromstd::vector,QVector, and many other types. Astd::arraybased interface requires that you use that specific container.