简介

QtConcurrent是针对qt中多线程相关的高层封装，如QFuture

结构

Qtconcurrent命名空间中的run支持的有

其对应的functor下结构为

类关系

functor对应的类核心关系为

RunFunctionTaskBase

• start()：默认使用的是全局线程池

QFuture<T> start(QThreadPool* poll)
{
	this->setThreadPool(pool);
	this->setRunnable(this);
	this->reportStarted();
	QFuture<T> theFuture = this->future();
	pool->start(this, 0);
	return theFuture;
}

• run()：是空实现

void run() {}

• runFunctor()：纯虚函数

virtual void runFunctor() = 0;

RunFunctionTask

是整个ＱtConcurrent::run执行框架

其重写了QRunnable的run方法，执行runFunctor

template <typename T>
class RunFunctionTask : public RunFunctionTaskBase<T>
{
public:
	void run() override
	{
		if (this->isCancelled()) {
			this->reportFinished();
			return;
		}
		
		#ifndef QT_NO_EXCEPTIONS
			try {
		#endif
				this->runFunctor();
		#ifndef QT_NO_EXCEPTIONS
			} catch(QException& e) {
				QFutureInterface<T>::reportException(e);
			} catch(...) {
				QFutureInferface<T>::reportException(QUnhandledException());
			}
		#endif

		this->reportResult(result);
		this->reportFinished();
	}
};