// d2mcpp: https://github.com/mcpp-community/d2mcpp

// license: Apache-2.0

// reference solution for: dslings/cpp11/04-rvalue-references.cpp

//

// 用途: 仅给 CI 与维护者参考使用，不是教程入口。

// 教程练习入口: dslings/cpp11/04-rvalue-references.cpp

//

#include <d2x/cpp/common.hpp>

#include <iostream>

#include <string>

struct Object;

static Object * object_address = nullptr;

struct Object {

int data = 0;

Object() {

std::cout << "Object():" << this << std::endl;

object_address = this;

}

Object(const Object&) { std::cout << "Object(const Object&):" << this << std::endl; }

Object(Object&&) { std::cout << "Object(Object&&):" << this << std::endl; }

~Object() { std::cout << "~Object():" << this << std::endl; }

};

int main() { // 关闭编译器优化

{

std::cout << "----> 临时对像 - 右值1" << std::endl;

Object();

std::cout << "----> 临时对像 - 右值2" << std::endl;

Object obj = Object();

(void)obj;

std::cout << "--------代码可修改区域-开始--------" << std::endl;

// 使用右值引用延长临时对象的生命周期, 并允许修改其值

Object &&objRef = Object();

std::cout << "--------代码可修改区域-结束--------" << std::endl;

objRef.data = 1; // 修改被延长生命周期的临时对象的值(不要直接改动这行代码)

std::cout << "objRef.data = " << objRef.data << " - " << &objRef << std::endl;

d2x_assert((&objRef == object_address));

}

return 0;

}