c++ - A 'using' declaration with an enum

Question

A using declaration does not seem to work with an enum type:

class Sample{
    public:
        enum Colour {RED, BLUE, GREEN};
}

using Sample::Colour;

does not work!

Do we need to add a using declaration for every enumerators of enum type? Like below:

using sample::Colour::RED;

Answer 1

A class does not define a namespace, and therefore "using" isn't applicable here.

Also, you need to make the enum public.

If you're trying to use the enum within the same class, here's an example:

class Sample {
 public:
  enum Colour { RED, BLUE, GREEN };

  void foo();
}

void Sample::foo() {
  Colour foo = RED;
}

And to access it from outside the class:

void bar() {
  Sample::Colour colour = Sample::RED;
}