c++ - How to convert enum to QString?

Question

I am trying to use the Qt reflection for converting enum to QString.

Here is the part of code:

class ModelApple
{
    Q_GADGET
    Q_ENUMS(AppleType)
public:
    enum AppleType {
      Big,
      Small
    }
}

And here is i trying to do:

convertEnumToQString(ModelApple::Big)

Return "Big"

Is this possible? If you have any idea about convertEnumToQString, please share it

Answer 1

You need to use Q_ENUM macro, which registers an enum type with the meta-object system.

enum AppleType {
  Big,
  Small
};
Q_ENUM(AppleType)

And now you can use the QMetaEnum class to access meta-data about an enumerator.

QMetaEnum metaEnum = QMetaEnum::fromType<ModelApple::AppleType>();
qDebug() << metaEnum.valueToKey(ModelApple::Big);

---

Here is a generic template for such utility:

template<typename QEnum>
std::string QtEnumToString (const QEnum value)
{
  return std::string(QMetaEnum::fromType<QEnum>().valueToKey(value));
}