c++后置递增运算符重载


#include
using namespace std;
class person {
    friend ostream& operator<<(ostream& cout, person& p);
public:
    person()
    {
        a = 0;

    }
public:
    person& operator++()
    {
        ++a;
        return *this;
    }
    person operator++(int)
    {
        person temp = *this;
        a++;
        return temp;
    }

private:
    int a;
};
ostream& operator<<(ostream& cout, person& p)
{
    cout << p.a;
    return cout;
}
int main()
{
    person p;
    cout << ++p<return 0;
}

main函数中下面的<<报错

img