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Question #332 Difficulty:
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?
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