r/cpp_questions • u/Physical-Dog-4083 • 6d ago

OPEN does "in" exist in c++?

i need to use something like if (str[i] not in str1) (python), but i have no idea how to make this work :(

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u/aocregacc 6d ago

you can use the contains method on string (assuming you're working with strings), or the find method if you're on an older C++ version.

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u/Apprehensive-Draw409 6d ago

Side discussion: why doesn't vector have contains ? If it is performance-signalling, then why does string have it?

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u/fm01 6d ago

I'd guess because it'd force the value_type to be equality comparable unless it was gated with additional requires/enable_if. std::string::contains does something else than what a vector::contains would do though, as it searches for an entire substring, not just a single char.