如何阅读以下主要代码？ 我不知道这个

Question

How to read the following code for main? I do not know this

Code:

class one
{
public:
    void operator()() const
    {
        f();
        f1();
    }
};

I want to call the operator To main?

Answer 1

void operator()() const defines a function call operator , which can be used as:

    one ob;

    ob(); // calls ob.operator()()

For another, more complete, example.

#include <iostream>

class Two
{
public:
    int operator()(const char *str) const
    {
        std::cout << "operator() called with " << str << std::endl;
        return 101;
    }
};

int main()
{
    Two two;
    int n = two("'test'");
    std::cout << "operator() returned " << n << std::endl;
}

Output:

operator() called with 'test'
operator() returned 101

Answer 2

You can create an instance of the class in the main function and call the function using that instance.

class one
{
public:
    void operator()() const
    {
        f();
        f1();
    }
};

int main() {
one obj_one;

// calling the member function -> method
obj_one.operator()();

return 0;
}