wmi

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singleton.h (585B)

      1 // Copyright (c) 2003 - 2009 Anselm R Garbe <anselm@garbe.us>
      2 // See LICENSE for license details.
      3 
      4 #ifndef __SINGLETON_H
      5 #define __SINGLETON_H
      6 
      7 /**
      8  * Basic singleton template used by various controller classes of WMI.
      9  */
     10 template <class T> class Singleton
     11 {
     12 
     13 public:
     14 
     15     static T *instance() {
     16         if (instance_ == 0) {
     17             // use default constructor
     18             instance_ = new T;
     19         }
     20         return instance_;
     21     }
     22 
     23 private:
     24 
     25     // the singleton instance
     26     static T *instance_;
     27 };
     28 
     29 template <class T> T* Singleton<T>::instance_ = 0;
     30 
     31 #endif // __SINGLETON_H