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Question #109 Difficulty: 3

According to the C++17 standard, what is the output of this program?

    #include <functional>
#include <iostream>

template <typename T>
void call_with(std::function<void(T)> f, T val)
{
	f(val);
}

int main()
{
	auto print = [] (int x) { std::cout << x; };
	call_with(print, 42);
}

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