Operator[]
The performance of [] in C and C++ is different.
e.g., when you excute A[index]
- If A is a object, it will call the operator[]
- If A is a pointer, it is equivalent to A + index
So, operator overloading is invalid to pointer.
标签：index,Fallible,point,C++,operator,pointer From： https://www.cnblogs.com/hongyugao/p/17723471.html