Handle.h

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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
 
#ifndef ICE_HANDLE_H
#define ICE_HANDLE_H
 
#include <IceUtil/Handle.h>
#include <Ice/Config.h>
 
//
// "Handle" or "smart pointer" template for classes derived from
// IceInternal::GCShared, IceUtil::Shared, or IceUtil::SimpleShared.
//
// In constrast to IceUtil::Handle, IceInternal::Handle<T> can be used
// for a type T that has been declared but not defined. The only
// requirement is a declaration of the following function:
//
// namespace IceInternal
// {
//     X* upCast(T*);
// }
//
// Where X is (or derives from) IceUtil::Shared or IceUtil::SimpleShared.
//
 
namespace IceInternal
{
 
template<typename T>
class Handle : public ::IceUtil::HandleBase<T>
{
public:
 
    Handle(T* p = 0)
    {
        this->_ptr = p;
 
        if(this->_ptr)
        {
            upCast(this->_ptr)->__incRef();
        }
    }
 
    template<typename Y>
    Handle(const Handle<Y>& r)
    {
        this->_ptr = r._ptr;
 
        if(this->_ptr)
        {
            upCast(this->_ptr)->__incRef();
        }
    }
 
    template<typename Y>
    Handle(const ::IceUtil::Handle<Y>& r)
    {
        this->_ptr = r._ptr;
 
        if(this->_ptr)
        {
            upCast(this->_ptr)->__incRef();
        }
    }
 
    Handle(const Handle& r)
    {
        this->_ptr = r._ptr;
 
        if(this->_ptr)
        {
            upCast(this->_ptr)->__incRef();
        }
    }
 
    ~Handle()
    {
        if(this->_ptr)
        {
            upCast(this->_ptr)->__decRef();
        }
    }
 
    Handle& operator=(T* p)
    {
        if(this->_ptr != p)
        {
            if(p)
            {
                upCast(p)->__incRef();
            }
 
            T* ptr = this->_ptr;
            this->_ptr = p;
 
            if(ptr)
            {
                upCast(ptr)->__decRef();
            }
        }
        return *this;
    }
 
    template<typename Y>
    Handle& operator=(const Handle<Y>& r)
    {
        if(this->_ptr != r._ptr)
        {
            if(r._ptr)
            {
                upCast(r._ptr)->__incRef();
            }
 
            T* ptr = this->_ptr;
            this->_ptr = r._ptr;
 
            if(ptr)
            {
                upCast(ptr)->__decRef();
            }
        }
        return *this;
    }
 
    template<typename Y>
    Handle& operator=(const ::IceUtil::Handle<Y>& r)
    {
        if(this->_ptr != r._ptr)
        {
            if(r._ptr)
            {
                upCast(r._ptr)->__incRef();
            }
 
            T* ptr = this->_ptr;
            this->_ptr = r._ptr;
 
            if(ptr)
            {
                upCast(ptr)->__decRef();
            }
        }
        return *this;
    }
 
    Handle& operator=(const Handle& r)
    {
        if(this->_ptr != r._ptr)
        {
            if(r._ptr)
            {
                upCast(r._ptr)->__incRef();
            }
 
            T* ptr = this->_ptr;
            this->_ptr = r._ptr;
 
            if(ptr)
            {
                upCast(ptr)->__decRef();
            }
        }
        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