C++ Tuple vs Struct

Question

Is there is any difference between using a std::tuple and a data-only struct?

typedef std::tuple foo_t;

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Answer 1

There shouldn't be a performance difference (even an insignificant one). At least in the normal case, they will result in the same memory layout. Nonetheless, casting between them probably isn't required to work (though I'd guess there's a pretty fair chance it normally will).