#ifndef SINGLETONBASE_H
#define SINGLETONBASE_H

//做一个单例
#include <QHash>
#include <QList>

//#include <iostream>
template<typename KeyType,typename ValueType,typename ChildType>
class SingletonBase
{
public:
    SingletonBase()
    {
        this->initInstance();
    }
//    ~SingletonBase();
    void add(const KeyType& key,const ValueType& val)
    {
        QHash<KeyType,ValueType> *t=SingletonBase<KeyType,ValueType,ChildType>::ht;
        (*t)[key]=val;
    }
    bool contains(const KeyType& key)
    {
        return SingletonBase<KeyType,ValueType,ChildType>::ht->contains(key);
    }
    ValueType& get(const KeyType& key)
    {
        QHash<KeyType,ValueType> *t=SingletonBase<KeyType,ValueType,ChildType>::ht;
        return (*t)[key];

    }
    QList<KeyType> keys()
    {
        return SingletonBase<KeyType,ValueType,ChildType>::ht->keys();
    }

private:

    void initInstance()
    {
//        if(SingletonBase<KeyType,ValueType,ChildType>::ht)
//        {
//            delete SingletonBase<KeyType,ValueType,ChildType>::ht;
//            SingletonBase<KeyType,ValueType,ChildType>::ht==NULL;
//        }
        if(!SingletonBase<KeyType,ValueType,ChildType>::ht)
        {
            SingletonBase<KeyType,ValueType,ChildType>::ht=new QHash<KeyType,ValueType>;
        }

    }
protected:

    class CG // 它的唯一工作就是在析构函数中删除CSingleton的实例
        {
            public:
                ~CG()
                {
                    if (SingletonBase::ht)
                        delete SingletonBase::ht;
                }
        };
    static CG Garbo; // 定义一个静态成员，在程序结束时，系统会调用它的析构函数
    static QHash<KeyType,ValueType> *ht;
};


template<typename KT,typename VT,typename CT>
QHash<KT,VT> *SingletonBase<KT,VT,CT>::ht=NULL;

#endif // SINGLETONBASE_H