学习笔记：引用类型的初始化

#include <iostream>     // std::cout

using namespace std;

int main()

{

    char i=97;

    char& r1 = i;       //r1是i的引用，二者等同

    int&& r2 = i;       //r2不是i的右值引用，是某临时对象的引用。伪代码：int tmp(i); int&& r2 = tmp; 

    const int& r3 = i;  //const int& 同样具有捕捉右值的能力。伪代码：int tmp(i); int&& r3 = tmp; 

    //char&& r4 = i;    //编译失败，r4不能捕捉左值

    cout << " i=" << (void*)addressof(i)<<endl;

    cout << "r1=" << (void*)addressof(r1)<<endl;

    cout << "r2=" << (void*)addressof(r2)<<endl;

    cout << "r3=" << (void*)addressof(r3)<<endl; //通过打印地址，证明了临时对象tmp的存在

    return 0;

}