// **********************************************************************
//
// Copyright (c) 2001
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************

#ifndef ICE_HANDLE_H
#define ICE_HANDLE_H

#include <IceUtil/Handle.h>
#include <Ice/Config.h>

//
// "Handle" or "smart pointer" class for classes derived from
// IceUtil::Shared or IceUtil::SimpleShared.
//
// In constrast to IceUtil::Handle, IceInternal::Handle requires the
// declaration of the two global operations IceInternal::incRef(T*)
// and IceInternal::decRef(T*). The use of global operations allows
// this template to be used for types which are declared but not
// defined, provided that the two above mentioned operations are
// declared.
//

namespace IceInternal
{

template<typename T>
class Handle : public ::IceUtil::HandleBase<T>
{
public:
    
    Handle(T* p = 0)
    {
	_ptr = p;

	if (_ptr)
	{
	    incRef(_ptr);
	}
    }
    
    template<typename Y>
    Handle(const Handle<Y>& r)
    {
	_ptr = r._ptr;

	if (_ptr)
	{
	    incRef(_ptr);
	}
    }

    template<typename Y>
    Handle(const ::IceUtil::Handle<Y>& r)
    {
	_ptr = r._ptr;

	if (_ptr)
	{
	    incRef(_ptr);
	}
    }

#ifdef _WIN32 // COMPILERBUG: Is VC++ or GNU C++ right here???
    template<>
    Handle(const Handle<T>& r)
#else
    Handle(const Handle& r)
#endif
    {
	_ptr = r._ptr;

	if (_ptr)
	{
	    incRef(_ptr);
	}
    }
    
    ~Handle()
    {
	if (_ptr)
	{
	    decRef(_ptr);
	}
    }
    
    Handle& operator=(T* p)
    {
	if (_ptr != p)
	{
	    if (p)
	    {
		incRef(p);
	    }

	    if (_ptr)
	    {
		decRef(_ptr);
	    }
	    
	    _ptr = p;
	}
	return *this;
    }
        
    template<typename Y>
    Handle& operator=(const Handle<Y>& r)
    {
	if (_ptr != r._ptr)
	{
	    if (r._ptr)
	    {
		incRef(r._ptr);
	    }

	    if (_ptr)
	    {
		decRef(_ptr);
	    }
	    
	    _ptr = r._ptr;
	}
	return *this;
    }

    template<typename Y>
    Handle& operator=(const ::IceUtil::Handle<Y>& r)
    {
	if (_ptr != r._ptr)
	{
	    if (r._ptr)
	    {
		incRef(r._ptr);
	    }

	    if (_ptr)
	    {
		decRef(_ptr);
	    }
	    
	    _ptr = r._ptr;
	}
	return *this;
    }

#ifdef _WIN32 // COMPILERBUG: Is VC++ or GNU C++ right here???
    template<>
    Handle& operator=(const Handle<T>& r)
#else
    Handle& operator=(const Handle& r)
#endif
    {
	if (_ptr != r._ptr)
	{
	    if (r._ptr)
	    {
		incRef(r._ptr);
	    }

	    if (_ptr)
	    {
		decRef(_ptr);
	    }
	    
	    _ptr = r._ptr;
	}
	return *this;
    }
        
    template<class Y>
    static Handle dynamicCast(const ::IceUtil::HandleBase<Y>& r)
    {
	return Handle(dynamic_cast<T*>(r._ptr));
    }

    template<class Y>
    static Handle dynamicCast(Y* p)
    {
	return Handle(dynamic_cast<T*>(p));
    }
};

}

#endif