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Question #112 Difficulty:
According to the C++17 standard, what is the output of this program?
#include <iostream>
#include <utility>
struct A
{
A() { std::cout << "1"; }
A(const A&) { std::cout << "2"; }
A(A&&) { std::cout << "3"; }
};
struct B
{
A a;
B() { std::cout << "4"; }
B(const B& b) : a(b.a) { std::cout << "5"; }
B(B&& b) : a(b.a) { std::cout << "6"; }
};
int main()
{
B b1;
B b2 = std::move(b1);
}
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