Question

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c++ const use in class methods
Meaning of “const” last in a C++ method declaration?

int operator==(const AAA &rhs) const;

This is a operator overloading declaration. Why put const at the end? Thanks

Answer 1

The const keyword signifies that the method isn’t going to change the object. Since operator== is for comparison, nothing needs to be changed. Therefore, it is const. It has to be omitted for methods like operator= that DO modify the object.

It lets the compiler double-check your work to make sure you’re not doing anything you’re not supposed to be doing. For more information check out http://www.parashift.com/c++-faq-lite/const-correctness.html.