diff options
Diffstat (limited to 'common/singleton.h')
-rw-r--r-- | common/singleton.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/common/singleton.h b/common/singleton.h index f26324999e..5e72e72230 100644 --- a/common/singleton.h +++ b/common/singleton.h @@ -37,6 +37,8 @@ private: Singleton<T>(const Singleton<T>&); Singleton<T>& operator= (const Singleton<T>&); + static T* _singleton; + /** * The default object factory used by the template class Singleton. * By specialising this template function, one can make a singleton use a @@ -56,13 +58,16 @@ public: public: static T& instance() { - // TODO: We aren't thread safe. + // TODO: We aren't thread safe. For now we ignore it since the + // only thing using this singleton template is the config manager, + // and that is first instantiated long before any threads. // TODO: We don't leak, but the destruction order is nevertheless // semi-random. If we use multiple singletons, the destruction // order might become an issue. There are various approaches // to solve that problem, but for now this is sufficient - static T *instance = T::makeInstance(); - return *instance; + if (!_singleton) + _singleton = T::makeInstance(); + return *_singleton; } protected: Singleton<T>() { } @@ -75,6 +80,8 @@ protected: typedef T SingletonBaseType; }; +#define DECLARE_SINGLETON(T) template<> T* Common::Singleton<T>::_singleton=0 + } // End of namespace Common #endif |