+=
+
Do not do this!
MyClass& badFunc() {
MyClass obj;
return obj; // ❌ 返回了局部变量引用！
}
int main() {
MyClass& ref = badFunc(); // ⚠️ 悬垂引用
}
or
>> and <<
Cannot be a number function, but when we need to access private variable, we could use friend.
[]
General Rule of Thumb
=
-
Be used to do copy assignment, a special member function which is define by default.
-
Be used to do move assignment, another special member function which is define by default.
POLA: Principle of Least Astonishment
Design operators primarily to mimic conventional usage.
Something else
