[英]Why connect `QThread::finished` signal to `QObject::deleteLater`?
[英]Is it necessary to delete an object if that runs on a QThread if finished signal of QThread is connected to deleteLater?
所以我在构造函数中有以下代码。
m_someObject = new SomeObject();
m_someObject->moveToThread(&m_thread);
m_thread.start();
connect(&m_thread, &QThread::finished, m_someObject, &QObject::deleteLater);
任何我在析构函数中都有以下代码。
m_thread.terminate();
while (m_thread.isRunning())
{
}
我仍然要删除m_someObject
尽管已经完成了m_thread
连接到deleteLater
插槽m_someObject
?
不,没有必要。 只要线程最终发出结束,连接就可以完全按照您想要的方式进行操作。 请参见以下代码:
#include <QObject>
#include <QThread>
#include <iostream>
class Test : public QObject {
Q_OBJECT
public:
Test(){
std::cout <<"c'tor" << std::endl;
}
~Test(){
std::cout << "d'tor" << std::endl;
}
};
void startThread(){
QThread* thr = new QThread();
Test* test = new Test();
connect(thr, &QThread::finished, test, &QObject::deleteLater);
test->moveToThread( thr );
thr->start();
thr->quit();
thr->wait();
delete thr;
}
输出是预期的:
c'tor
d'tor
请注意,由于缺少主要代码,因此代码片段不会立即编译。
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