Comment by grandempire
2 days ago
No. This is how sum types are implemented.
And from a runtime perspective it’s going to be a struct with perhaps more padding. You’ll need more details about your specific threat model to explain why that’s bad.
2 days ago
No. This is how sum types are implemented.
And from a runtime perspective it’s going to be a struct with perhaps more padding. You’ll need more details about your specific threat model to explain why that’s bad.
a quick search says that std::variant is the modern replacement to implement your niche feature "sum types"
Not a niche feature. Fundamental for any decent language with a type system.
ok, but C99 and C++11 and others, all have ways to implement types. "Fundemental" as you say.. using UNION in C++ is not a good choice to implement types.. in old C99, you can use UNION that way but why? footguns all around.
Whoa, that's a core building block of programming and computer science that you're dismissing as "niche" without explanation.
yes types are a core building block of programming and computer science, but not using UNION ? this casual dismissal of "criticisms of UNION" here seems superficial and un-wise to me.
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That’s for C++. And how is std::variant implemented?
not using a union: https://ojdip.net/2013/10/implementing-a-variant-type-in-cpp... because the union can't be extended with variadic template types
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