错误左值需要作为一元“&”操作数

Question

我在对象中创建线程时遇到问题。错误是 lvalue required as unary '&' operand

CPP 文件

#include "AirQ.h"


static int i=0;


AirQ::AirQ(int pinNo, bool input):Sensor("AIRQUALITY", "PPM",pinNo,input) {
    threadShouldRunAQ = true;
    this->bufferLength = 256;

        signal(SIGINT, AirQ::signalHandler);
        airQualitySensor = new upm::Ublox6(pinNo);

        if (!airQualitySensor->setupTty(B9600))
            std::cerr << "[ERROR][GPS] Failed to setup tty port parameters!" << std::endl;

        try
        {
            std::thread air = std::thread(&AirQ::processDataAQ(), this);
        }
        catch (std::exception e)
        {
            std::cerr << "[ERROR][GPS] " << e.what() << std::endl;
        }
}

AirQ::~AirQ() {
    // TODO Auto-generated destructor stub
}


void AirQ::signalHandler(int sigNo)
{
    if (sigNo == SIGINT)
        threadShouldRunAQ = false;

}

void AirQ::processDataAQ()
{

    while (threadShouldRunAQ)
    {
        i++;
        if (airQualitySensor != NULL)
            if (airQualitySensor->dataAvailable())
            {
                //TODO
            }


            usleep(100000);
    }
}

void AirQ::getData(std::string value)
{
    this->readBuffer = value;
}

std::string AirQ::logData()
{
    AirQ::setCollectedFlag(false);
    return this->readBuffer;
}

void AirQ::setCollectedFlag(bool flag)
{
    this->collectedFlag = flag;
}

H 文件

#include <ublox6.h>
#include "Sensor.h"

#ifndef AIRQ_H_
#define AIRQ_H_

static bool threadShouldRunAQ;
static upm::Ublox6* airQualitySensor;



class AirQ: private Sensor {
private:
    std::string readBuffer;
    bool collectedFlag;
    size_t bufferLength;
    static void signalHandler(int);
    void processDataAQ();

protected:


public:
    AirQ(int, bool);
    virtual ~AirQ();

    std::string logData();
    void getData(std::string);
    void setCollectedFlag(bool);
    std::thread processingThread;
};


#endif /* AIRQ_H_ */

CPP文件第行报错 std::thread air = std::thread(&AirQ::processDataAQ(), this); 我不明白哪里出了问题。

我主要是像这样创建对象。

AirQ* test = new AirQ(0,true);

如有任何帮助，我们将不胜感激。

解决方法：将 &AirQ::processDataAQ() 更改为 &AirQ::processDataAQ。后者是指向成员函数的指针。 – 皮特·贝克尔

Answer 1

std::thread air = std::thread(&AirQ::processDataAQ(), this);
//                                                ^^

括号内调用函数。您不想调用该函数；你只想给它命名。

删除括号。

我还建议取消复制初始化。

所以，简单地说：

std::thread air(&AirQ::processDataAQ, this);

错误左值需要作为一元“&”操作数

Error lvalue required as unary '&' operand

c++

multithreading

intel-edison