What's the use of const here

Question

in

int salary() const { return mySalary; }

as far as I understand const is for this pointer, but I\'m not sure. Can any one tell me what is the us

Answer 1

It's a const method. It means that it won't modify the member variables of the class nor will it call non-const methods. Thus:

const foo bar;
bar.m();

is legal if m is a const method but otherwise wouldn't be.