C++ (Qt)
class MyContainer : public QObject {
...
 QVector <MyObject *> mData;
};
 
..
MyContainer cont;
MyReceiver * receiver;
..
for (int i = 0; i < cont.mData.size(); ++i)
  QObject::connect(cont.mData[i], &MyObject::SomeSignal, receiver, &MyReceiver::SomeSlot);

C++ (Qt)
cont.ConnectAll(receiver, &MyReceiver::SomeSlot);  // а внутри метода уже цикл
 

C++ (Qt)
    template <typename Func>
    void connectAll(const typename QtPrivate::FunctionPointer<Func>::Object *receiver, Func slot)
    {
        for (int i = 0; i < mData.size(); ++i)
            connect(mData[i], &MyObject::Signal, receiver, slot);
    }
 

C++ (Qt)
    template <class TObj, class TMethod>
    void connectAll(TObject *receiver, TMethod method)
    {
        for (int i = 0; i < mData.size(); ++i)
            connect(mData[i], &MyObject::Signal, receiver, method);
    }