'Which C++ version is supported for all iOS apps supported by Apple?

I want to use std::variant in iOS app but iOS-11 does not support std::variant. I get compilation error:

a.cpp:55:17: error: 'visit<(lambda at a.cpp:43:19) &, std::variant<foo, bar, baz> &>' is unavailable: introduced in iOS 11.0
    return std::visit(...);

I still want to support iOS 11. I could have avoided writing code this way if there was a way to know which C++ version is supported for all the iOS apps. Are there ways to know which C++ version is supported for all iOS apps supported by Apple at any point in time?

c++ios


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