/usr/include/dcmtk/oflog/helpers/pointer.h is in libdcmtk-dev 3.6.2-3build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Module: Log4CPLUS
// File: pointer.h
// Created: 6/2001
// Author: Tad E. Smith
//
//
// Copyright 2001-2010 Tad E. Smith
//
// 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.
//
// Note: Some of this code uses ideas from "More Effective C++" by Scott
// Myers, Addison Wesley Longmain, Inc., (c) 1996, Chapter 29, pp. 183-213
//
/** @file */
#ifndef DCMTK_LOG4CPLUS_HELPERS_POINTERS_HEADER_
#define DCMTK_LOG4CPLUS_HELPERS_POINTERS_HEADER_
#include "dcmtk/oflog/config.h"
#if defined (DCMTK_LOG4CPLUS_HAVE_PRAGMA_ONCE)
#pragma once
#endif
#include "dcmtk/oflog/thread/syncprim.h"
#include <algorithm>
#include <cassert>
#if ! defined (DCMTK_LOG4CPLUS_SINGLE_THREADED) \
&& defined (DCMTK_LOG4CPLUS_HAVE_CXX11_ATOMICS)
#include <atomic>
#endif
namespace dcmtk {
namespace log4cplus {
namespace helpers {
/******************************************************************************
* Class SharedObject (from pp. 204-205) *
******************************************************************************/
class DCMTK_LOG4CPLUS_EXPORT SharedObject
{
public:
void addReference() const;
void removeReference() const;
protected:
// Ctor
SharedObject()
: access_mutex()
, count(0)
{ }
SharedObject(const SharedObject&)
: access_mutex()
, count(0)
{ }
// Dtor
virtual ~SharedObject();
// Operators
SharedObject& operator=(const SharedObject&) { return *this; }
public:
thread::Mutex access_mutex;
private:
#if defined (DCMTK_LOG4CPLUS_SINGLE_THREADED)
typedef unsigned count_type;
#elif defined (DCMTK_LOG4CPLUS_HAVE_CXX11_ATOMICS)
typedef STD_NAMESPACE atomic<unsigned> count_type;
#elif defined (_WIN32) || defined (__CYGWIN__)
typedef long count_type;
#else
typedef unsigned count_type;
#endif
mutable count_type count;
};
/******************************************************************************
* Template Class SharedObjectPtr (from pp. 203, 206) *
******************************************************************************/
template<class T>
class SharedObjectPtr
{
public:
// Ctor
explicit
SharedObjectPtr(T* realPtr = 0)
: pointee(realPtr)
{
addref ();
}
SharedObjectPtr(const SharedObjectPtr& rhs)
: pointee(rhs.pointee)
{
addref ();
}
#if defined (DCMTK_LOG4CPLUS_HAVE_RVALUE_REFS)
SharedObjectPtr(SharedObjectPtr && rhs)
: pointee (STD_NAMESPACE move (rhs.pointee))
{
rhs.pointee = 0;
}
SharedObjectPtr & operator = (SharedObjectPtr && rhs)
{
rhs.swap (*this);
return *this;
}
#endif
// Dtor
~SharedObjectPtr()
{
if (pointee)
pointee->removeReference();
}
// Operators
bool operator==(const SharedObjectPtr& rhs) const { return (pointee == rhs.pointee); }
bool operator!=(const SharedObjectPtr& rhs) const { return (pointee != rhs.pointee); }
bool operator==(const T* rhs) const { return (pointee == rhs); }
bool operator!=(const T* rhs) const { return (pointee != rhs); }
T* operator->() const {assert (pointee); return pointee; }
T& operator*() const {assert (pointee); return *pointee; }
SharedObjectPtr& operator=(const SharedObjectPtr& rhs)
{
return this->operator = (rhs.pointee);
}
SharedObjectPtr& operator=(T* rhs)
{
SharedObjectPtr<T> (rhs).swap (*this);
return *this;
}
// Methods
T* get() const { return pointee; }
void swap (SharedObjectPtr & other) throw ()
{
T* tmp = pointee;
pointee = other.pointee;
other.pointee = tmp;
}
typedef T * (SharedObjectPtr:: * unspec_bool_type) () const;
operator unspec_bool_type () const
{
return pointee ? &SharedObjectPtr::get : 0;
}
bool operator ! () const
{
return ! pointee;
}
private:
// Methods
void addref() const
{
if (pointee)
pointee->addReference();
}
// Data
T* pointee;
};
} // end namespace helpers
} // end namespace log4cplus
} // end namespace dcmtk
#endif // DCMTK_LOG4CPLUS_HELPERS_POINTERS_HEADER_
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