#include <iostream>

using namespace std;

template <class T>
class MyClass {
public:
    void func1(){
    cout<<"default: func1"<<endl;
     }
    void func2(){
    cout<<"default: func2"<<endl;
     }
private:
    T haha;
};

template <>
void MyClass<double>::func1() {
    cout<<"special: func1"<<endl;
}

int main()
{
    MyClass<int> intclass;
    intclass.func1();
    intclass.func2();

    MyClass<double> doubleclass;
    doubleclass.func1();
    doubleclass.func2();  // error 'class MyClass<double>' has no member named 'func2'
    return 0;
}