#include <iostream>

#include <vector>

#include <string>

class MoveTest {

public:

MoveTest() {

}

MoveTest(const MoveTest& a) {

std::cout << " copy struct is using\n";

p = new char(*(a.p));

}

MoveTest(MoveTest&& a) {

std::cout << " move struct is using\n";

p = a.p;

a.p = nullptr;

delete a.p;

a.a = 100;

this->a = 99;

}

~MoveTest() {

if (p){

delete p;

}

}

void add_char(char text) {

p = new char(text);

}

void change_vec(int a) {

vec[0] = a;

}

int a;

char* p = nullptr;

std::vector<int> vec {4};

};

void test_f(MoveTest test) {

std::cout << " ===after move, test.a is " <<test.a <<" test.vec is " << test.vec.front() << std::endl;

test.a = 1;

}

void test_f(MoveTest& test) {

std::cout << " ===++after move, test.a is " << test.a <<" test.vec is " << test.vec.front() << std::endl;

test.a = 1;

}

int main() {

MoveTest test1;

test1.add_char('a');

MoveTest test2 = test1;

MoveTest test3 = std::move(test2);

test3.change_vec(9);

test_f(std::move(test3)); // after add std::move to test3, the move is using, which made the test3 undefined;

std::cout << " after move, test3.a is " << test3.a << " test3.vec is "<< test3.vec.front() << std::endl;

return 0;

}