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Question #332 Difficulty: 3

According to the C++23 standard, what is the output of this program?

    #include <iostream>

struct S {
    template <typename Callable>
    void operator[](Callable f) {
        f();
    }
};

int main() {
    auto caller = S{};
    caller[ []{ std::cout << "C";} ];
}

Hint:

What does two [[consecutive]] square brackets usually mean? Could there be a parsing problem here?

Answer:

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