Question

In a C++ function, can I use one of the parameter’s getter to set the default value of the other parameter following it? For example if I have the followig class Foo,

class Foo{
   public:
      setID();
      getID();
   private:
      string id;
}

Can I write a function fooManipulator like this,

int fooManipulator(Foo bar, string id = bar.getId());

Answer 1

No, as has been stated, the order of evaluation of arguments to a function is unspecified.

However, you can achieve the effect easily with an overload like this:

int fooManipulator(Foo bar)
{
    return fooManipulator(bar, bar.getId());
}