Assignment operators can be overloaded. Unlike the compoundassignment operators, every assignment operator, regardless of parameter type, must be defined as a member function.
// illustration of assignment operators for class string class string { public: string& operator=(const string &); // s1 = s2; string& operator=(const char *); // s1 = "str"; string& operator=(char); // s1 = 'c'; // .... };
Assignment Should Return a Reference to *this 。 Moreover, because assignment returns a reference there is no
need to create and destroy a temporary copy of the result.
无需多说，照着用就行了。因为你是给本类的对象赋值，所以少一个参数还是很方便的
