data_package.h 文件
#ifndef DATA_PACKAGE_H
#define DATA_PACKAGE_H
#include <QObject>
class DataPackage : public QObject
{
Q_OBJECT
public:
static DataPackage &instance();
signals:
public slots:
private:
explicit DataPackage(QObject *parent = 0);
};
#endif // DATA_PACKAGE_H
data_package.cpp 文件
#include "data_package.h"
#include <QDebug>
DataPackage::DataPackage(QObject *parent) :
QObject(parent)
{
qDebug() << "init data package";
}
DataPackage& DataPackage::instance()
{
static DataPackage _instance;
return _instance;
}
调用：
DataPackage::instance();
DataPackage::instance();
连续调用两次 instance 方法，发现只会示例一次。搞定。