Question

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What does const mean following a function/method signature?

Go ahead laugh at me, but what does the const after the function indicate?

int someFunc() const{  //<<----notice the const
    //insert code  blah...
}

If I wanted to a return type of const int wouldn’t I just write

const int someFunc(){
    //code....
}

Answer 1

it means that the function can’t alter any member variables.

class A {
void Func() const
{
  ++mI; // compiler error
}
int mI;
};