没有用于初始化'string'的匹配构造函数（又名'basic_string '）

Here is the code:

这是代码:

#include <iostream>
#include <string>

using namespace std; 

class Foo { 
public:
    operator string() const { return n; }
    string n {"foo"};
};

int main (int argc, char** argv) {

    string s {Foo{}};
    cout << s << endl;

    return 0;
}
#include <iostream>