c++中如何在编译期检测一个类有没有重载某静态函数？

#include<iostream>
#include <type_traits>

template<typename T>
class has_static_func {
    template<typename C>
    static char test(decltype(&C::static_func));
    template<typename C>
    static long test(...);

public:
    enum { value = sizeof(test<T>(0)) == sizeof(char) };
};

class MyClass {
public:
    static void static_func() {
        std::cout << "MyClass::static_func() called"<< std::endl;
    }
};

class MyOtherClass {
public:
    // static void static_func() {
    //     std::cout << "MyOtherClass::static_func() called"<< std::endl;
    // }
};

int main() {
    std::cout << "MyClass has static_func: "<< std::boolalpha<< has_static_func<MyClass>::value<< std::endl;
    std::cout << "MyOtherClass has static_func: "<< std::boolalpha<< has_static_func<MyOtherClass>::value<< std::endl;
    return 0;
}

MyClass has static_func: true
MyOtherClass has static_func: false