对临时的常量引用

After reading this article on Herb Sutter's blog, I experimented a bit and ran into something that puzzles me. I am using Visual C++ 2005, but I would be surprised if this was implementation dependent.

这是我的代码:

#include <iostream>

using namespace std;

struct Base {
    //Base() {}
    ~Base() { cout << "~Base()" << endl; }
};

int main()
{
    const Base & f = Base();
}

运行时，它显示~Base()"两次...但是如果我取消注释构造函数，它只显示一次！