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Question #289 Difficulty: 2

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

    #include <iostream>

void f(int a = []() { static int b = 1; return b++; }())
{
    std::cout << a;
}

int main()
{
    f();
    f();
}

Hint:

The lambda expression results in a single type with a member function operator() which has a static local variable static int b.

Answer:

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