error：不能引用Watch的默认构造函数，它是已经删除的函数？
#include<iostream>
#include<stdlib.h>
#include<string>
using namespace std;
class Watch;
class Time {
friend Watch;
public:
Time(int h, int m, int s) {
hour = h;
minute = m;
second = s;
}
private:
int hour;
int minute;
int second;
};
class Watch {
public:
void print() {
cout << t.hour << ":" << t.minute << ":" << t.second << endl;
}
private:
Time t;
};
int main() {
Time time(7, 8, 55);
Watch w;//这里出现了问题
w.print();
system("pause");
return 0;
}
