Log in Qt

#ifndef LOG_H
#define LOG_H

#include "singleton.h"

#include <QTextStream>

/*!
 * \brief Provides log
 * \author Etrnls <[email protected]>
 */
class Log : public QObject, public Singleton<Log>
{
    Q_OBJECT
public:
    template <class T>
    Log& operator<<(const T &x)
    {
        stream << ' ' << x;
        return *this;
    }
private:
    QTextStream stream;

    Log();
    virtual ~Log();

    friend class Singleton<Log>;
    friend Log& log(const QObject *object);
};

/*!
 * \brief The global function to retrieve the instance of the Log
 */
Log& log(const QObject *object);

#endif
//-------------------------------------
#include "log.h"

#include <QFile>
#include <QDir>
#include <QFileInfo>
#include <QMetaClassInfo>
#include <QDateTime>
#include <QCoreApplication>

Log::Log()
{
    QFile *file = new QFile(QFileInfo(QDir(QCoreApplication::applicationDirPath()),
                        QLatin1String("log")).absoluteFilePath());
    file->open(QFile::WriteOnly | QFile::Truncate | QFile::Text | QFile::Unbuffered);
    stream.setDevice(file);
}

Log::~Log()
{
    delete stream.device();
}

Log& log(const QObject *object)
{
    const QMetaObject *metaObject = object->metaObject();

    Log::getInstance()->stream << '[' << QDateTime::currentDateTime().toString(Qt::ISODate) << ']'
                << '[' << metaObject->classInfo(metaObject->indexOfClassInfo("log")).value() << ']';

    return *Log::getInstance();
}