I want to save lambda expressions variables (like in the fist code block). The problem is that then I use a classes (like the second code block) the compiler return me some errors. I don"t know how to fix it.

I hope somebody can help me and explain, why it's not working like this. Thanks.

First Code:

```
// variable for function pointer
void (*func)(int);
// default output function
void my_default(int x) {
    cout << "x =" << "\t" << x << endl << endl;
}

int main() {
    cout << "Test Programm\n\n";

    // 1. Test - default output function
    cout << "my_default\n";
    func = &my_default;
    func(5);

    // 2. Test - special output function 2
    cout << "my_func2\n";
    func = [](int x) {  cout << "x =" << "  " << x << endl << endl; };
    func(5);

    return 0;
}

```

Second Code:

```
class test {
private:
    // variable for function pointer
    void (*func)(int);
    // default output function
    void my_default(int x) {
        cout << "x =" << "\t" << x << endl << endl;
    }

public:
    void dummy(void) {
        // 1. Test - default output function
        cout << "my_default\n";
        func = &my_default;
        func(5);

        // 2. Test - special output function 2
        cout << "my_func2\n";
        func =  [](int x)->int{ cout << "x =" << "  " << x << endl << endl; };
        func(5);
    }
};

// entry
int main() {
    cout << "Test Programm\n\n";

    test a;
    a.dummy();

    return 0;
}

```

Compiler:

```
pi@raspberrypi ~/dev/property $ gcc -std=c++0x -o test2 test2.cpp -lstdc++
test2.cpp: In member function ‘void test::dummy()’:
test2.cpp:491:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say ‘&test::my_default’ [-fpermissive]
test2.cpp:491:17: error: cannot convert ‘void (test::*)(int)’ to ‘void (*)(int)’ in assignment
test2.cpp:496:77: error: invalid user-defined conversion from ‘test::dummy()::<lambda(int)>’ to ‘void (*)(int)’ [-fpermissive]
test2.cpp:496:28: note: candidate is: test::dummy()::<lambda(int)>::operator int (*)(int)() const <near match>
test2.cpp:496:28: note:   no known conversion for implicit ‘this’ parameter from ‘int (*)(int)’ to ‘void (*)(int)’

```