QNetworkAccessManager singleton class example

hiren21

I am new in both qt and c++, can someone give me example of QNetworkAccessManager singleton class ?

raven-worx

@hiren21
actually any singleton example on the web is applicable since the pattern is independant of the type, but here you go:

QNetworkAccessManager* getNAM() {
    static QNetworkAccessManager* nam = new QNetworkAccessManager;
    return nam;
}

VRonin

.h file

class QNAMwrapper{
static QNetworkAccessManager* m_qnam;
public:
static QNetworkAccessManager* getQNAM() {
Q_ASSERT_X(m_qnam,"QNAMwrapper","You must create an instance of QNAMwrapper before using the QNAM");
return m_qnam;
}
QNAMwrapper(){
Q_ASSERT_X(!m_qnam,"QNAMwrapper","Only one instance of QNAMwrapper can be created");
if(!m_qnam) m_qnam=new QNetworkAccessManager;
}
~QNAMwrapper(){delete m_qnam; m_qnam=Q_NULLPTR;}
};

cpp file

QNetworkAccessManager* QNAMwrapper::m_qnam = Q_NULLPTR;

This works like QApplication and handles the lifecycle of QNetworkAccessManager. So in your main add QNAMwrapper qnamw; and then you can use the QNetworkAccessManager via QNAMwrapper::getQNAM();