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我不明白为什么该语句test()()要调用函数调用运算符。

#include <iostream>
#include <thread>
using namespace std;

class test{
public:
    test(){
        cout<<"i am in constructor"<<endl;
    }
    void operator() (){
        cout<<"i am in an overloaded function"<<endl;
    }
};

int main()
{
   test t;
   test()();
   return 0;
}

输出 -

#include <iostream>
#include <thread>
using namespace std;

class test{
public:
    test(){
        cout<<"i am in constructor"<<endl;
    }
    void operator() (){
        cout<<"i am in an overloaded function"<<endl;
    }
};

int main()
{
   test t;
   test()();
   return 0;
}