应用于const和非const对象的引用返回方法

Question

Consider the following code:

class A{

  my_method(const B& b){
    import_something_from_c(this, b.getC()); // does some sort of copying
  }

}

class B{
  const C& getC() const { return c; };
}

function f(B b){
  b.getC().changeSomething();
}

Since my_method guarantees const, b.getC() must also be const. In f however, I do not guarantee constness and I do want to change the very same b.getC().

Is there some sort of a way to propagate the constness of an object to methods returning references to its members?

Answer 1

You need to provide a non-const overload of getC() . For example

C& getC() { return c; };