simgear/scene/util/OsgSingleton.hxx

   1 #ifndef SIMGEAR_OSGSINGLETON_HXX
   2 #define SIMGEAR_OSGSINGLETON_HXX 1
   3
   4 #include <simgear/structure/Singleton.hxx>
   5
   6 #include <osg/Referenced>
   7 #include <osg/ref_ptr>
   8
   9 namespace simgear {
  10
  11 template <typename RefClass>
  12 class SingletonRefPtr
  13 {
  14 public:
  15     SingletonRefPtr()
  16     {
  17         ptr = new RefClass;
  18     }
  19     static RefClass* instance()
  20     {
  21         SingletonRefPtr& singleton
  22             = boost::details::pool::singleton_default<SingletonRefPtr>::instance();
  23         return singleton.ptr.get();
  24     }
  25 private:
  26     osg::ref_ptr<RefClass> ptr;
  27 };
  28
  29 template <typename RefClass>
  30 class ReferencedSingleton : public virtual osg::Referenced
  31 {
  32 public:
  33     static RefClass* instance()
  34     {
  35         return SingletonRefPtr<RefClass>::instance();
  36     }
  37 };
  38
  39 }
  40
  41 #endif