Enums in QT

Bhushan_Sure

Hi, I have 4 enums in Code like and there messages.

enum A {
Message1=0;
}
enum B{
Message2=1;
}
enum C {
Message3=2;
}
enum D {
Message4=3;
}

Now my Question How can i Defined Generic Method which can take Parameter/Argument as Any enum like A,B,C,D.

Currently I am Doing this

void CommonApi(Qvariant message) {
 qDebug()<<message;
}

But its Printing Enum Values like 0,1,2,etc.

If i do seperately like

void Api1(classname::A message) {
qDebug()<<message;
}
void Api2(classname::B message) {
qDebug()<<message;
}
void Api3(classname::C message) {
qDebug()<<message;
}
void Api4(classname::D message) {
qDebug()<<message;
}

Then all above is printing Respective Messages. But this is seprate method, i want generic one !

sierdzio

What happens when you change the enums into enum class?

enum class A {
  Message1=0
};
// ... etc.

The reason why it does not work for QVariant is that enums are really just integers. A generic method does not know which enum did the number come from. So I don't think this can be done with enums in a generic way. That is not what enums are for.

Bhushan_Sure

@sierdzio Okay, Can you suggest me some alternative for this ?

sierdzio

What do you want to achieve? Have some predefined messages? Then you can use a global header where you define them, like:

namespace Tags {
  const char *Name1 = "Some string";
  const char *Name2 = "Some other string";
};

If you need to stringify enum names, you can use QMetaEnum like this:

class Enums {
  Q_GADGET
  enum A {
    Message1,
    Message2
  } Q_ENUM(A);

  QString aToString(const A value) {
    const QMetaEnum metaEnum(QMetaEnum::fromType<Enums::A>());
    const QString name(metaEnum.valueToKey(int(value)));
    return name;
  }
}