root/trunk/dep/include/zthread/CountedPtr.h @ 2

/*
 * Copyright (c) 2005, Eric Crahen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef __ZTCOUNTEDPTR_H__
#define __ZTCOUNTEDPTR_H__

#include <algorithm>
#include <cassert>

#include "zthread/AtomicCount.h"

#ifdef _MSC_VER
# pragma warning(push)
# pragma warning(disable:4786)  // warning: long template symbol name
# pragma warning(push)
# pragma warning(disable:4284)  // warning: odd return type for operator->
#endif

namespace ZThread {
  
  /**
   * @class CountedPtr
   *
   * @author Eric Crahen <http://www.code-foo.com/>
   * @date <2003-07-29T06:43:48-0400>
   * @version 2.3.0
   *
   */
  template <typename T, typename CountT = AtomicCount>
    class CountedPtr {

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)
      template <typename U, typename V> friend class CountedPtr;
#endif
#endif

      CountT* _count;
      T*  _instance;

      public:

      CountedPtr() : _count(0), _instance(0) { }

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      explicit CountedPtr(T* raw) : _count(new CountT()), _instance(raw) {
        (*_count)++;
      }

#endif
#endif

      template <typename U>
      explicit CountedPtr(U* raw) : _count(new CountT()), _instance(raw) {
        (*_count)++;
      }

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      CountedPtr(const CountedPtr& ptr) : _count(ptr._count), _instance(ptr._instance) {

        if(_count)
          (*_count)++;

      }

#endif
#endif

      template <typename U, typename V>
      CountedPtr(const CountedPtr<U, V>& ptr) : _count(ptr._count), _instance(ptr._instance) {

        if(_count)
          (*_count)++;

      }

      ~CountedPtr() {

        if(_count && --(*_count) == 0) {
   
          if(_instance) 
            delete _instance;

          delete _count;
      
        }

      }
  

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      const CountedPtr& operator=(const CountedPtr& ptr) {
    
        typedef CountedPtr<T, CountT> ThisT;

        ThisT(ptr).swap(*this);
        return *this;

      } 

#endif
#endif

      template <typename U, typename V>
      const CountedPtr& operator=(const CountedPtr<U, V>& ptr) {
    
        typedef CountedPtr<T, CountT> ThisT;

        ThisT(ptr).swap(*this);
        return *this;

      } 

      void reset() {

        typedef CountedPtr<T, CountT> ThisT;
        ThisT().swap(*this);

      }

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      void swap(CountedPtr& ptr) {

        std::swap(_count, ptr._count);
        std::swap(_instance, ptr._instance);

      }

#endif
#endif
          
      template <typename U, typename V>
      void swap(CountedPtr<U, V>& ptr) {

        std::swap(_count, ptr._count);
        std::swap(_instance, ptr._instance);

      }

      // Convience operators

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      bool less(const CountedPtr& ptr) const {
        return _instance < ptr._instance;
      }

#endif
#endif

      template <typename U, typename V>
      bool less(const CountedPtr<U, V>& ptr) const {
        return _instance < ptr._instance;
      }


#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

      bool equal(const CountedPtr& ptr) const {
        return _count == ptr._count;
      }

#endif
#endif

      template <typename U, typename V>
      bool equal(const CountedPtr<U, V>& ptr) const {
        return _count == ptr._count;
      }


      friend inline bool operator==(const CountedPtr& lhs, const CountedPtr& rhs) {
        return lhs.equal(rhs);
      }

      friend inline bool operator<(const CountedPtr& lhs, const CountedPtr& rhs) {
        return lhs.less(rhs);
      }


      T& operator*() {
        assert(_instance != 0);
        return *_instance;
      }

      T* operator->() {
        assert(_instance != 0);
        return _instance;
      }

      const T* operator->() const {
        assert(_instance != 0);
        return _instance;
      }
 
      bool operator!() const {
        return _instance == 0;
      }

      operator bool() const {
        return _instance != 0;
      }
      
    }; /* CountedPtr */

  template<typename U, typename V, typename X, typename Y> 
    inline bool operator<(CountedPtr<U, V> const &lhs, CountedPtr<X, Y> const &rhs) {
    return lhs.less(rhs);
  }

  template<typename U, typename V, typename X, typename Y> 
    inline bool operator==(CountedPtr<U, V> const &lhs, CountedPtr<X, Y> const &rhs) {
    return lhs.equal(rhs.get);
  }

  template<typename U, typename V, typename X, typename Y> 
    inline bool operator!=(CountedPtr<U, V> const &lhs, CountedPtr<X, Y> const &rhs) {
    return !(lhs.equal(rhs.get));
  }

  template<typename U, typename V, typename X, typename Y> 
    inline void swap(CountedPtr<U, V> const &lhs, CountedPtr<X, Y> const &rhs) {
    lhs.swap(rhs);
  }

#if !defined(__MWERKS__)
#if !defined(_MSC_VER) || (_MSC_VER > 1200)

  template<typename U, typename V>
    inline bool operator<(CountedPtr<U, V> const &lhs, CountedPtr<U, V> const &rhs) {
    return lhs.less(rhs);
  }

  template<typename U, typename V> 
    inline bool operator==(CountedPtr<U, V> const &lhs, CountedPtr<U, V> const &rhs) {
    return lhs.equal(rhs.get);
  }

  template<typename U, typename V> 
    inline bool operator!=(CountedPtr<U, V> const &lhs, CountedPtr<U, V> const &rhs) {
    return !(lhs.equal(rhs.get));
  }

  template<typename U, typename V> 
    inline void swap(CountedPtr<U, V> const &lhs, CountedPtr<U, V> const &rhs) {
    lhs.swap(rhs);
  }

#endif
#endif

} // namespace ZThread

#ifdef _MSC_VER
# pragma warning(pop)
# pragma warning(pop)
#endif    


#endif // __ZTCOUNTEDPTR_H__