Instance one class

Jeronimo

Hi i'm trying to do one example to instance one class.
At first i add headers:

#ifndef EXAMPLE_H
#define EXAMPLE_H

#include <QObject>

class Example : public QObject
{
    Q_OBJECT
public:
    static Example &instance();
    explicit Example(QObject *parent = 0);

signals:
    //here i put my signals
public slots:
};

#endif // EXAMPLE_H

Cpp, here i need to include some function to emit the instance will be great if some one take ideas:

#include "example.h"

Example &Example::instance()
{
    static MouseLogger _instance;
    return _instance;
}


Example::Example(QObject *parent) : QObject(parent)
{
    HINSTANCE hInstance = GetModuleHandle(NULL);

}

Main function:

#include <QCoreApplication>
#include <QDebug>
#include "example.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    
    QObject::connect(&Example::instance(),
                     [](){


    });

    return a.exec();
}

Any example or suggestion is good for know more about instance class thx

koahnig

@Jeronimo

Did you have a look to the examples page?

There are plenty of different examples.

mrjj

Hi
It is a Singleton.
Not much to say about it except its just glorified global variable and
all the issues that comes from that. Some even call it an
anti-pattern.
anyway, this topic is already beaten like an old horse ;)
so you can google if it matters.

here i need to include some function to emit the instance
Ehh ? Emit when?
Normally you would use Example::instance() to get the global variable.

Jeronimo

@koahnig But related with my question?

mrjj

@Jeronimo
Hi
Do you ask about using a SingleTon ?
(Single instance class)

Just google for it. its all over the net :)

Jeronimo

@mrjj yeah in the net a lot but outdate i think . Ok i will search more about this and the example koahnig help me a lot thx.