gistfile1.cpp

#include <QApplication>
#include <QThread>
#include <memory>
#include <iostream>

#define USE_UNIQUE_PTR

template<typename T, typename ...Args>
std::unique_ptr<T> make_unique( Args&& ...args )
{
    return std::unique_ptr<T>( new T( std::forward<Args>(args)... ) );
}

struct Signal
{
public:
    Signal() : ptr(nullptr) {}
#ifdef USE_UNIQUE_PTR
    std::unique_ptr<char> ptr;
#else
    char *ptr;
#endif
};

class Sender : public QThread
{
    Q_OBJECT
public:
    void run()
    {        
        Signal s;
#ifdef USE_UNIQUE_PTR
        s.ptr = make_unique<char>();
#else
        s.ptr = new char();
#endif
        *s.ptr = 'A';

        emit signal(s);
    }
signals:
    void signal(const Signal & sig);
};

class Receiver : public QObject
{
    Q_OBJECT
public slots:
    void signal(const Signal & sig)
    {
        std::cout << "Got signal: *ptr = '" << *sig.ptr << "'" << std::endl;
    }
};

#include "test_move_signal.moc"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Receiver receiver;
    Sender sender;
    
    qRegisterMetaType<Signal>("Signal");

    QObject::connect(&sender, &Sender::signal, &receiver, &Receiver::signal);

    sender.start();
    app.exec();
}