单列模版 C++ Qt

单列模版

#ifndef _SINGTON_H_
#define  _SINGTON_H_
#include <QMutex>
#include <QSharedPointer>
    template<typename T>
    class Singleton {
    public:
        static T *instance() {
            if(m_instance.isNull()){
                QMutexLocker lock(&m_mutex);
                if(m_instance.isNull()){
                    m_instance=QSharedPointer<T>(new T);
                }
            }
            return m_instance.data();
        }
        virtual ~Singleton()=0;
    protected:
        Singleton() {

        }


    private:
        static QMutex m_mutex;
        static QSharedPointer<T> m_instance;
    };
    template <typename T>
    Singleton<T>::~Singleton<T>(){


    }
    template<typename T>
    QMutex  Singleton<T>::m_mutex;

    template<typename T>
    QSharedPointer<T>  Singleton<T>::m_instance;


#define  DECLARE_SINGTON_CONSTRUCT(CLASS_NAME)\
    protected: \
    CLASS_NAME(); \
    friend class Singleton<CLASS_NAME>;\
    public:\
    virtual ~CLASS_NAME();

#define DECLARE_SINGTON_CONSTRUCT_WITH_BASE(CLASS_NAME,BASE_NAME)\
    protected:\
    CLASS_NAME(BASE_NAME*parent=nullptr);\
    friend class Singleton<CLASS_NAME>;\
    public:\
    virtual ~CLASS_NAME();


#endif _SINGTON_H_

使用案列

#ifndef GENERATEDATANODE_H
#define GENERATEDATANODE_H

#include "listnode.h"
#include "uicommondef.h"
#include "base/Singleton.hpp"
class GenerateDataNode : public Singleton<GenerateDataNode>
{
    DECLARE_SINGTON_CONSTRUCT(GenerateDataNode)
public:
    QList<DataNode> buildDataNode(const MENU_WIDGET_INDEX &index);

protected:
    QList<DataNode> DiyMenuManagerIndex();


    QList<DataNode> DiySlideMenuIndex();

    QList<DataNode> MainMenuIndex();
    QList<DataNode> ShortCutMenuIndex();
    QList<DataNode> ColorPalettesIndex();

    QList<DataNode> ImageSettingIndex(); // 图像设置菜单
    //    QList<DataNode> CompensttionIndex();

    QList<DataNode> ReticleZeroIndex();

    QList<DataNode> PowerSettingIndex();

    QList<DataNode> RecordSettingIndex();

    QList<DataNode> GeneralSettingIndex();

    QList<DataNode> ReticleSettingIndex();

    QList<DataNode> DateTimeSettingIndex();
};

#endif // GENERATEDATANODE_H