Qt实现指定线程执行回调

typedef std::function<void()> InvokerFunc;
class Invoker: public QObject
{
Q_OBJECT
public:
Invoker(QObject *parent=0):
QObject(parent)
{
qRegisterMetaType<InvokerFunc>("InvokerFunc");
}

void execute(const InvokerFunc &func, bool block)
{
if (QThread::currentThread()==thread())
{//is same thread
func();
return;
}
if (block)
{
metaObject()->invokeMethod(this, "onExecute", Qt::BlockingQueuedConnection,
Q_ARG(InvokerFunc, func));
}
else{
metaObject()->invokeMethod(this, "onExecute", Qt::QueuedConnection,
Q_ARG(InvokerFunc, func));
}
}

private slots:
void onExecute(const InvokerFunc &func)
{
func();
}
};