C++ template member method callable from QML

[ODБOï]

Hi,
I need a function that can take an int,float,double or string

class PlcCom : public QObject
{
    Q_OBJECT
public:
    explicit PlcCom(QObject *parent = nullptr);

    template<typename T>
    void setValue(T v){
        QString input = typeid(v).name();

    }
}

but i can't call this method from QML..

If i mark this method as public slot i will get

Error: Template function as signal or slot

If i mark it Q_INVOKABKE i get :

moc_plccom.cpp:180: erreur : expected type-specifier before 'T'
case 18: _t->setValue((reinterpret_cast< T()>(_a[1]))); break;
moc_plccom.cpp:180: erreur : expected '>' before 'T'
moc_plccom.cpp:180: erreur : expected '>' before 'T'
moc_plccom.cpp:180: erreur : expected primary-expression before ')' token
case 18: _t->setValue((reinterpret_cast< T()>(_a[1]))); break;
moc_plccom.cpp:180: erreur : 'T' was not declared in this scope
case 18: _t->setValue((reinterpret_cast< T()>(_a[1]))); break;

How to call a tamplate member function from QML please ?

[KroMignon]

@LeLev said in C++ template member method callable from QML:

How to call a tamplate member function from QML please ?

I do not think this is possible.
I think the best way is to used QVariant as parameter, because QML needs to be able to convert it own type into matching C++ type.

Something like this:

class PlcCom : public QObject
{
    Q_OBJECT
public:
    explicit PlcCom(QObject *parent = nullptr);

    Q_INVOKABLE void setValue(const QVariant& v){
        if(v.isValid()) {
            qDebug() << "Received" << v.typeName() << "value";
        }
        else {
            qDebug() << "Invalid value!";
        }
    }
}

[ODБOï]

hi @KroMignon
thak you very much for the quick answer