Can a C++ enum class have methods?

Question

I have an enum class with two values, and I want to create a method which receives a value and returns the other one. I also want to maintain type safety(that\'s why I use e

Answer 1

Based on jtlim's answer

Idea (Solution)

enum ErrorType: int {
  noConnection,
  noMemory
};

class Error {
public:
  Error() = default;
  constexpr Error(ErrorType type) : type(type) { }

  operator ErrorType() const { return type; }
  constexpr bool operator == (Error error) const { return type == error.type; }
  constexpr bool operator != (Error error) const { return type != error.type; }    
  constexpr bool operator == (ErrorType errorType) const { return type == errorType; }
  constexpr bool operator != (ErrorType errorType) const { return type != errorType; }

  String description() { 
    switch (type) {
    case noConnection: return "no connection";
    case noMemory: return "no memory";
    default: return "undefined error";
    }
 }

private:
  ErrorType type;
};

Usage

Error err = Error(noConnection);
err = noMemory;
print("1 " + err.description());

switch (err) {
  case noConnection: 
    print("2 bad connection");
    break;
  case noMemory:
    print("2 disk is full");
    break;
  default: 
    print("2 oops");
    break;
}

if (err == noMemory) { print("3 Errors match"); }
if (err != noConnection) { print("4 Errors don't match"); }