Best practices for registering custom types for QtJsonSerializer about qtjsonserializer HOT 2 CLOSED

I would recommend to put it in the same place as you put qRegisterMetaType<T>() calls. What exactly you do depends on your general code style, I would say.

In my opinion, there are 2 clean ways to do this, that I would recommend (besides just putting everything in the main): Either hidden or explicit.

The explicit variant would add a static register function to each object, that can be automatically called for dynamic libraries and applications. For example:

struct Gadget_C {
    QString name;
    static void registerMetaType() {
        qRegisterMetaType<Gadget_C>();
        QJsonSerializer::registerListConverters<Gadget_C>();
    }
};
// and optionally in the cpp:
namespace {
    void startup_hook() {
        Gadget_C::registerMetaType();
    }
}
Q_COREAPP_STARTUP_FUNCTION(startup_hook)

The hidden option instead uses the constructor of the gadget to register itself the first time one is created:

struct Gadget_C {
    QString name;
    Gadget_C() {
        static auto once = true;
        if (once) {
            once = false;
            qRegisterMetaType<Gadget_C>();
            QJsonSerializer::registerListConverters<Gadget_C>();
        }
    }
};

from qtjsonserializer.

Thank you for ideas!

from qtjsonserializer.