/usr/include/IceUtil/Handle.h is in libzeroc-ice35-dev 3.5.1-6.4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (c) 2003-2013 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_UTIL_HANDLE_H
#define ICE_UTIL_HANDLE_H
#include <IceUtil/Exception.h>
#include <algorithm>
//
// "Handle" or "smart pointer" class for classes derived from
// IceUtil::Shared, IceUtil::SimpleShared, or IceInternal::GCShared.
//
namespace IceUtil
{
template<typename T>
class HandleBase
{
public:
typedef T element_type;
T* get() const
{
return _ptr;
}
T* operator->() const
{
if(!_ptr)
{
//
// We don't throw directly NullHandleException here to
// keep the code size of this method to a minimun (the
// assembly code for throwing an exception is much bigger
// than just a function call). This maximises the chances
// of inlining by compiler optimization.
//
throwNullHandleException(__FILE__, __LINE__);
}
return _ptr;
}
T& operator*() const
{
if(!_ptr)
{
//
// We don't throw directly NullHandleException here to
// keep the code size of this method to a minimun (the
// assembly code for throwing an exception is much bigger
// than just a function call). This maximises the chances
// of inlining by compiler optimization.
//
throwNullHandleException(__FILE__, __LINE__);
}
return *_ptr;
}
operator bool() const
{
return _ptr ? true : false;
}
void swap(HandleBase& other)
{
std::swap(_ptr, other._ptr);
}
T* _ptr;
private:
void throwNullHandleException(const char *, int) const;
};
template<typename T> inline void
HandleBase<T>::throwNullHandleException(const char* file, int line) const
{
throw NullHandleException(file, line);
}
template<typename T, typename U>
inline bool operator==(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
T* l = lhs.get();
U* r = rhs.get();
if(l && r)
{
return *l == *r;
}
// Note: don't use if { } else { }. This causes lots warnings when
// compiling with GCC and optimization enabled. See bug 2330.
return !l && !r;
}
template<typename T, typename U>
inline bool operator!=(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
return !operator==(lhs, rhs);
}
template<typename T, typename U>
inline bool operator<(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
T* l = lhs.get();
U* r = rhs.get();
if(l && r)
{
return *l < *r;
}
// Note: don't use if { } else { }. This causes lots warnings when
// compiling with GCC and optimization enabled. See bug 2330.
return !l && r;
}
template<typename T, typename U>
inline bool operator<=(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
return lhs < rhs || lhs == rhs;
}
template<typename T, typename U>
inline bool operator>(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
return !(lhs < rhs || lhs == rhs);
}
template<typename T, typename U>
inline bool operator>=(const HandleBase<T>& lhs, const HandleBase<U>& rhs)
{
return !(lhs < rhs);
}
template<typename T>
class Handle : public HandleBase<T>
{
public:
Handle(T* p = 0)
{
this->_ptr = p;
if(this->_ptr)
{
this->_ptr->__incRef();
}
}
template<typename Y>
Handle(const Handle<Y>& r)
{
this->_ptr = r._ptr;
if(this->_ptr)
{
this->_ptr->__incRef();
}
}
Handle(const Handle& r)
{
this->_ptr = r._ptr;
if(this->_ptr)
{
this->_ptr->__incRef();
}
}
~Handle()
{
if(this->_ptr)
{
this->_ptr->__decRef();
}
}
Handle& operator=(T* p)
{
if(this->_ptr != p)
{
if(p)
{
p->__incRef();
}
T* ptr = this->_ptr;
this->_ptr = p;
if(ptr)
{
ptr->__decRef();
}
}
return *this;
}
template<typename Y>
Handle& operator=(const Handle<Y>& r)
{
if(this->_ptr != r._ptr)
{
if(r._ptr)
{
r._ptr->__incRef();
}
T* ptr = this->_ptr;
this->_ptr = r._ptr;
if(ptr)
{
ptr->__decRef();
}
}
return *this;
}
Handle& operator=(const Handle& r)
{
if(this->_ptr != r._ptr)
{
if(r._ptr)
{
r._ptr->__incRef();
}
T* ptr = this->_ptr;
this->_ptr = r._ptr;
if(ptr)
{
ptr->__decRef();
}
}
return *this;
}
template<class Y>
static Handle dynamicCast(const 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
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