//

// Created by light on 19-12-22.

//

#include <iostream>

using namespace std;

// Can copy and move

class A {

public:

A() { cout << "Create A\n"; }

~A() { cout << "Destroy A\n"; }

A(const A &) { cout << "Copy A\n"; }

A(A &&) { cout << "Move A\n"; }

A &operator=(const A &a) {

std::cout << "copy assignment" << std::endl;

return *this;

}

A &operator=(A &&a) {

cout << "move assignment\n";

return *this;

}

};

// 编译器无法优化

A getA_duang() {

A a1;

A a2;

if (rand() > 42) {

return a1;

} else {

return a2;

}

}

int main() {

// cout<<"拷贝"<<endl;

// auto a = getA_duang();

cout << "赋值" << endl;

A aa;

aa = getA_duang();

}