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Singleton.inl

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//*** Singleton.inl ***

#include "Debug.h"

// Static instance pointer
template <class TYPE> TYPE* Singleton<TYPE>::staticInstancePointer_=0;


//*** Constructor ***

template <class TYPE> 
Singleton<TYPE>::Singleton()
   {
   if (staticInstancePointer_)
      {
      FatalError("Attempt to create multiple instances of a singleton system.");
      }

   staticInstancePointer_=static_cast<TYPE*>(this);
   }


//*** Destructor ***

template <class TYPE> 
Singleton<TYPE>::~Singleton()
   {
   if (!staticInstancePointer_)
      {
      FatalError("Attempt to destroy singleton instance when it has not been created.");
      }
   staticInstancePointer_=0;
   }


//*** CreateInstance ***

template <class TYPE> 
void Singleton<TYPE>::CreateInstance()
   {
   if (staticInstancePointer_)
      {
      FatalError("Attempt to create multiple instances of a singleton system.");    
      }
   
   staticInstancePointer_=new TYPE();
   }


//*** DestroyInstance ***

template <class TYPE> 
void Singleton<TYPE>::DestroyInstance()
   {
   if (!staticInstancePointer_)
      {
      FatalError("Attempt to destroy singleton instance when it has not been created.");
      }
   
   delete staticInstancePointer_;
   staticInstancePointer_=0;
   }


//*** GetInstance ***

template <class TYPE> 
TYPE* Singleton<TYPE>::GetInstance()
   {
   if (!staticInstancePointer_)
      {
      FatalError("Attempt to access a singleton instance before it's been created.");
      }
   
   return staticInstancePointer_;
   }


//*** IsInstanceCreated ***

template <class TYPE> 
bool Singleton<TYPE>::IsInstanceCreated()
   {
   if (!staticInstancePointer_)
      {
      return false;
      }
   
   return true;
   }

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