Ejemplo

class MyClass {
public:
MyClass (char *nameInput, int twoInput, int threeInput);
private:
char *one;
int two, three;
int four;
};

MyClass::MyClass (char *nameInput, int twoInput, int threeInput) : two(twoInput), one(nameInput), three(threeInput), four(twoInput + threeInput)
{
}


Solución
Inicialice los miembros de clase en el mismo orden en el que se han declarado.

class MyClass {
public:
MyClass (char *nameInput, int twoInput, int threeInput);
private:
char *one;
int two, three;
int four;
};

MyClass::MyClass (char *nameInput, int twoInput, int threeInput) : one(nameInput), 
two(twoInput), three(threeInput), four(twoInput + threeInput)
{
}