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Not that I like go at all but because of it my C++ is starting to look like it as I am returning tuples of [result, error].

I try to avoid exceptions, is there any better ways? (Variant looks a bit more complicated but could be a totally OK alternative)

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C++23 introduces std::expected, which is a simpler alternative to std::variant designed specifically for the result-or-error use case. You still don't get pattern matching, but Go-style tuples don't give you that either.

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