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92 lines
3.3 KiB
92 lines
3.3 KiB
10 months ago
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#ifndef SINGLETON_H
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#define SINGLETON_H
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#include <QMutex>
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#include <QScopedPointer>
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////////////////////////////////////////////////////////////////////////////////
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/// ///
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/// Singleton signature ///
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/// ///
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////////////////////////////////////////////////////////////////////////////////
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/**
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* 使用方法:
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* 1. 定义类为单例:
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* class ConnectionPool {
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* SINGLETON(ConnectionPool) // Here
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* public:
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*
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* 2. 实现无参构造函数，析构函数
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* 3. 获取单例类的对象:
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* Singleton<ConnectionPool>::getInstance();
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* ConnectionPool &pool = Singleton<ConnectionPool>::getInstance();
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* 注意: 如果单例的类需要释放的资源和 Qt 底层的信号系统有关系，例如 QSettings，QSqlDatabase 等，
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* 需要在程序结束前手动释放(也就是在 main() 函数返回前调用释放资源的函数)，
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* 否则有可能在程序退出时报系统底层的信号错误，导致如 QSettings 的数据没有保存。
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*/
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template <typename T>
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class Singleton
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{
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public:
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static T& getInstance()
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{
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static T instance;
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return instance;
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};
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Singleton(T &&) = delete;
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Singleton(const T &) = delete;
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void operator = (const T &) = delete;
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T *operator &() = delete;
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private:
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Singleton() = default;
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virtual ~Singleton() = default;
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// static QMutex mutex;
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// static QScopedPointer<T> instance;
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};
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////////////////////////////////////////////////////////////////////////////////
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/// ///
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/// Singleton definition ///
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/// ///
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////////////////////////////////////////////////////////////////////////////////
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#if 0
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//template <typename T> QMutex Singleton<T>::mutex;
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//template <typename T> QScopedPointer<T> Singleton<T>::instance;
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//template <typename T>
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//T& Singleton<T>::getInstance()
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//{
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// if (instance.isNull())
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// {
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// mutex.lock();
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// if (instance.isNull())
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// {
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// instance.reset(new T());
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// }
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// mutex.unlock();
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// }
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// return *instance.data();
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//}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// ///
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/// Singleton Macro ///
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/// ///
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////////////////////////////////////////////////////////////////////////////////
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#if 0
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//#define SINGLETON(Class) \
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//private: \
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// Class(); \
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// ~Class(); \
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// Class(const Class &other); \
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// Class& operator=(const Class &other); \
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// friend class Singleton<Class>; \
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// friend struct QScopedPointerDeleter<Class>;
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#endif
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#define SINGLETON(Class) friend class Singleton<Class>
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#endif // SINGLETON_H
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