Defining the []= operator

Question

I'm writing a class Grid whose elements are Points - an (int) grid each of whose squares has a (double) point in it. I've already defined this (the height value is stored elsewhere):

Point &operator[](Point p) { return floor(get_x(p)) + height * floor(get_y(p)); }

and I want to define the assignment operator. How would one go about this? Is it defined automatically based on the [] operator?

So far I have

Point &operator[]=(Point p, Point q) { data[floor(get_y(p)) * height + floor(get_x(p))] = q; }

but that seems like a circular definition.

Answer 1

这不是它的工作方式， []运算符应该返回该索引处元素的引用，并且该元素 （类型）应该支持operator= （即Point::operator= ）