Operator overload of << needs const; produces headache

Question

I am trying to overload operator <<, but it always need to be a const function. However, I want to change values inside this overloaded function

Answer 1

You're likely doing something wrong then. Post the relevant bits of your code, along with a better summary of what your trying to do, and you'll get more help.

That being said, if you need to modify some data in a const object, there are a couple things you can do:

1. Declare the member you want to modify mutable.
2. Use const_cast<...>(...) to remove the const modifier from the passed in object.

But most likely you're trying to do something the wrong way.