QObject :: connect：不能排队类型'int&'的参数 [英] QObject::connect: Cannot queue arguments of type 'int&'

问题描述

我尝试这样做：

connect(this, SIGNAL(signalClicked(int&)),  classA, SLOT(doWork(int&)));

但我收到标题中的消息。
所以我探索了互联网，我想出了这个不工作的解决方案：

But I get the message in the title. So I've explored the internet and I came up with this solution which is not working aswell:

 qRegisterMetaType<int&>("Type");
 connect(this, SIGNAL(signalClicked(Type)),  classA, SLOT(doWork(Type)));

（错误：没有匹配函数调用'qRegisterMetaType（const char [5]）'）

(Error : no matching function for call to ‘qRegisterMetaType(const char[5])’)

任何解决方案？
感谢您的帮助。

Any solutions ? Thanks for your help.

推荐答案

如果Qt正在尝试排队参数，意味着连接在线程。这不适用于非const引用。

If Qt is trying to queue the arguments that means that the connection is between threads. This will not work for non-const references.

您可以使用reference_wrapper解决这个问题，但我强烈建议您重新考虑您的设计。在信号/槽连接中传递参考值不是一个好主意。

You could use a reference_wrapper to work around this, but I would strongly suggest that you reconsider your design. Passing values by reference in signal/slot connections is not a good idea.

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