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# QSignal Class Reference

The QSignal class can be used to send signals for classes that do not inherit QObject. More...

    #include <QSignal>

Part of the QtCore module.

- List of all members, including inherited members

### Public Functions

- QSignal ()
- ~QSignal ()
- void activate ( const T & t )
- bool connect ( const QObject * receiver, const char * member, Qt::ConnectionType type = Qt::AutoConnection )
- bool disconnect ( const QObject * receiver, const char * member = 0 )

## Detailed Description

The QSignal class can be used to send signals for classes that do not inherit QObject.

If you want to send signals from a class that does not inherit QObject, you can create an internal `QSignal<T>` object to emit the signal. `T` is the type of the signal's argument, and it can be `void`. You must also provide a function that connects the signal to an outside object slot.

In general, we recommend inheriting QObject instead, since QObject provides much more functionality.

Example:

        class MyClass
        {
        public:
            MyClass();
            ~MyClass();

            void doSomething();

            void connect(QObject *receiver, const char *member);

        private:
            QSignal<void> sig;
        };

        void MyClass::doSomething()
        {
            // ... does something

            sig->activate(); // emits the signal
        }

        void MyClass::connect(QObject *receiver, const char *member)
        {
            sig->connect(receiver, member);
        }

## Member Function Documentation

### QSignal::QSignal ()

Constructs a signal object

### QSignal::~QSignal ()

Destroys the signal. All connections are removed.

### void QSignal::activate ( const T & t )

Emits the signal with value t.

### bool QSignal::connect ( const QObject * receiver, const char * member, Qt::ConnectionType type = Qt::AutoConnection )

Connects the signal to member in object receiver using the given connection type.

See also disconnect().

### bool QSignal::disconnect ( const QObject * receiver, const char * member = 0 )

Disconnects the signal from member in object receiver.

See also connect().