How to create a single-shot, one-time connection to a lambda?

[Violet Giraffe]

I use the new Qt5 syntax and lambdas a lot, e. g.:

connect(_textFadeOutAnimation, &QPropertyAnimation::finished, [this, text](){
});

The problem I'm facing right now is I need this slot to only be fired once. Since there's no ConnectionType for that, I need to disconnect inside the slot, apparently. But how do I disconnect a lambda? I can't pass the QMetaObject::Connection inside the lambda for the obvious reason...

[Paul Colby]

Hi @Violet-Giraffe,

Interesting question.

What about something like (untested):

QMetaObject::Connection * const connection = new QMetaObject::Connection;
*connection = connect(_textFadeOutAnimation, &QPropertyAnimation::finished, [this, text, connection](){
    QObject::disconnect(*connection);
    delete connection;
});

[Violet Giraffe]

@Paul-Colby, brilliant, that works! Thank you. It didn't occur to me Connection has an assignment operator.

[beecksche]

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