.h

#ifndef MULTHREAD_H
#define MULTHREAD_H
#include"qobject.h"
#include "qthread.h"
using namespace std;

class Thread : public QThread
{
    Q_OBJECT
public:
    Thread();
    ~Thread();
    /**
     * @brief setFunc 设置匿名函数
     * @param func 匿名函数
     */
    void setFunc(function<void()>func);
    void quitThread();
private:
    void run();

private:
     function<void()>m_func;
};

class MulThread : public QObject
{
     Q_OBJECT
public:
    MulThread();
    ~MulThread();
    /**
     * @brief run 开启一个线程运行一个匿名函数并加入线程池
     * @param func 匿名函数
     * @return int 返回线程的id (当前线程池开启的线程的id)
     */
    int run(function<void()>func);
    void quitAllThread();
    void quitThread(int threadId);
signals:
    void signal_finshed(int threadId);
private:
    QMap<int,Thread*> m_thredPool;
    int m_id = 0;
};

#endif // MULTHREAD_H

.cpp

#include "MulThread.h"

Thread::Thread()
{

}

Thread::~Thread()
{
    quitThread();
}

void Thread::run()
{
    m_func();
}

void Thread::setFunc(function<void()>func)
{
    m_func = func;
}

void Thread::quitThread()
{
    quit();
    wait();
}

MulThread::MulThread()
{

}

MulThread::~MulThread()
{
    quitAllThread();
}

int MulThread::run(function<void()>func)
{
    Thread* thread = new Thread;
    thread->setFunc(func);
    int id = m_id;
    QObject::connect(thread,&Thread::finished,this,[=](){
        quitThread(id);
        emit signal_finshed(id);
    });
    m_thredPool.insert(id,thread);
    thread->start();
    m_id++;
    return id;
}

void MulThread::quitAllThread()
{
    qDeleteAll(m_thredPool);
    m_thredPool.clear();
}

void MulThread::quitThread(int threadId)
{
    delete m_thredPool[threadId];
    m_thredPool.remove(threadId);
}

使用：

void MainWindow::test()
{
    threadPool = new MulThread;
    connect(threadPool,&MulThread::signal_finshed,[=](int id){
        qDebug()<<"threadId:"<<id<<endl;
    });
    threadPool->run([=](){
        for(int i = 0;i<100;i++)
        {
            qDebug()<<"haha"<<endl;
        }
    });
    threadPool->run([=](){
        for(int i = 0;i<50;i++)
        {
            qDebug()<<"zzzzzz"<<endl;
        }
    });
    threadPool->run([=](){
        for(int i = 0;i<50;i++)
        {
            qDebug()<<"0000"<<endl;
        }
    });
    threadPool->run([=](){
        for(int i = 0;i<10000;i++)
        {
            qDebug()<<"pppppp"<<endl;
        }
    });
}