Cant create an instance of custom class extending Qobject.

[tonnot]

This is a piece of the header:

class Qt_utiles : public QObject
{
    Q_OBJECT
public:
    explicit Qt_utiles(QObject *parent = 0);
.....

class Qt_utiles : public QObject
{
    Q_OBJECT
public:
    explicit Qt_utiles(QObject *parent = 0);
.....

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and the constructor into cpp :

Qt_utiles::Qt_utiles(QObject *parent) :
    QObject(parent)
{
}

Qt_utiles::Qt_utiles(QObject *parent) :
    QObject(parent)
{
}

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Ok. My questions ....

Must I create the class in this way ?:
Qt_utiles *qt_utiles : at h.file
Qt_utiles qt_utiles(0) :at cpp.file

There is another way ?
Every class that extends Qt must be created using * approach ?
(Yes, I know that these are basic C++ questions ...)
Thanks