#include <functional>

    #include <QDebug>

    #include <QtConcurrent/QtConcurrentMap>
    #include <QtConcurrent/QtConcurrentRun>
    #include <QDir>
    #include <QImage>
    #include <QMutexLocker>
    #include <QStringList>

    #include "loadImages.hpp"

    loadImages::loadImages(QObject *parent) : QObject(parent)
    {
        namespace ph = std::placeholders;
        QStringList names;
        names<<"/Users/yyyy/Downloads/1359170070532.jpg"<<"/Users/yyyy/Downloads/1370902954521.jpg"
             <<"/Users/yyyy/Downloads/1370968889277.jpg"<<"/Users/yyyy/Downloads/1373155482891.jpg";

        for(auto const &data: names){
            QImage img(data);
            qDebug()<<names<<" is null : "<<img.isNull();
        }

        QThreadPool::globalInstance()->setMaxThreadCount(1);

        QtConcurrent::map(names, std::bind(&loadImages::loadImagesImpl, this, ph::_1)); //always crash
        //QtConcurrent::run(this, &loadImages::loadImagesImpl_2, names); //work fine
    }

    void loadImages::loadImagesImpl_2(QStringList const &names)
    {
        for(auto const &data: names){
            QImage img(data);
        }
    }

    void loadImages::loadImagesImpl(QString const &name)
    {
        //I don't think we need a mutex at here, but I want to give this "workaround" a try
       //no matter I add this mutex or not, the program always crash
        QMutexLocker lock(&mutex_);

        QImage img(name);
    }