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Question #394 Difficulty: 3

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

    #include <iostream>
#include <utility>

struct A {
    A() = default;
    A(const A&)  { std::cout << '1'; }
    A(A&&)       { std::cout << '2'; }
};

A a;

int main() {
    [a = std::move(a)]() {
        [a = std::move(a)]() {
        }();
    }();
}

Hint:

Remember that, unless declared mutable, a lambda’s call operator is const by default, so its captured data members are treated as const inside the body.

Answer:

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