C:/knet/include/kNet/SharedPtr.h

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/* Copyright 2010 Jukka Jylänki

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. */
#pragma once

#include <malloc.h>
#include <cstdlib>
#include <cassert>

#define Ptr(type) kNet::SharedPtr< type > 

namespace kNet
{

class RefCountable
{
public:
   RefCountable():refCount(0) {}
// ~RefCountable() {} // Can't put any functionality here since not virtual.

   void AddRef() { ++refCount; }
   void DecRef() { assert(refCount > 0); --refCount; }
   unsigned int RefCount() { return refCount; }

private:
   unsigned int refCount;
};

template<typename T>
class SharedPtr
{
public:
   SharedPtr():dataPtr(0) {}

   SharedPtr(T *ptr);

   SharedPtr(const SharedPtr<T> &rhs);

   template<typename T2>
   SharedPtr(const SharedPtr<T2> &rhs);

   SharedPtr<T> &operator=(const SharedPtr<T> &rhs);

   SharedPtr<T> &operator=(T *ptr);

   // Releases use of the object.
   ~SharedPtr();

   unsigned int RefCount() const; 

   const T *ptr() const; 
   const T *operator->() const; 
   const T &operator*() const; 

   operator T*(); 

   T *ptr(); 
   T *operator->(); 
   T &operator*(); 

   operator bool() const; 

   operator bool(); 

private:
   T *dataPtr;       

   void AddRef();    
   void Release();   
};

template<typename T>
bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b)
{
   if (a.ptr() == b.ptr())
      return true;
   else
      return false;
}

} // ~kNet

#include "kNet/SharedPtr.inl"