/usr/include/ITK-4.5/itkWeakPointer.h is in libinsighttoolkit4-dev 4.5.0-3.
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 Insight Software Consortium
*
* 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.txt
*
* 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.
*
*=========================================================================*/
#ifndef __itkWeakPointer_h
#define __itkWeakPointer_h
#include "itkMacro.h"
#include <iostream>
namespace itk
{
/** \class WeakPointer
* \brief Implements a weak reference to an object.
*
* WeakPointer implements a weak reference to an object. A natural
* interface to the class is defined by operator -> (and *) among others.
* WeakPointer is really nothing more than a standard pointer. It is used
* to call attention to the fact that it does not adjust the reference
* count of an object like SmartPointer does. WeakPointer is used internally
* to Insight to manage (break) reference counting loops. At some point,
* an object may keep track of how many objects hold weak references to
* itself. In all cases, however, an outstanding weak reference will not
* keep an object from destructing.
*
* \ingroup ITKSystemObjects
* \ingroup DataAccess
* \ingroup ITKCommon
*/
template< typename TObjectType >
class WeakPointer
{
public:
/** Extract information from template parameter. */
typedef TObjectType ObjectType;
/** Constructor. */
WeakPointer ()
{ m_Pointer = 0; }
/** Copy constructor. */
WeakPointer (const WeakPointer< ObjectType > & p):m_Pointer(p.m_Pointer) {}
/** Constructor to pointer p. */
WeakPointer (ObjectType *p):m_Pointer(p) {}
/** Destructor. */
~WeakPointer ()
{ m_Pointer = 0; }
/** Overload operator ->. */
ObjectType * operator->() const
{ return m_Pointer; }
/** Return pointer to object. */
operator ObjectType *() const
{ return m_Pointer; }
/** Template comparison operators. */
template< typename R >
bool operator==(R r) const
{
return ( m_Pointer == (ObjectType *)r );
}
template< typename R >
bool operator!=(R r) const
{
return ( m_Pointer != (ObjectType *)r );
}
/** Access function to pointer. */
ObjectType * GetPointer() const
{ return m_Pointer; }
/** Comparison of pointers. Less than comparison. */
bool operator<(const WeakPointer & r) const
{ return (void *)m_Pointer < (void *)r.m_Pointer; }
/** Comparison of pointers. Greater than comparison. */
bool operator>(const WeakPointer & r) const
{ return (void *)m_Pointer > (void *)r.m_Pointer; }
/** Comparison of pointers. Less than or equal to comparison. */
bool operator<=(const WeakPointer & r) const
{ return (void *)m_Pointer <= (void *)r.m_Pointer; }
/** Comparison of pointers. Greater than or equal to comparison. */
bool operator>=(const WeakPointer & r) const
{ return (void *)m_Pointer >= (void *)r.m_Pointer; }
/** Overload operator assignment. */
// cppcheck-suppress operatorEqVarError
WeakPointer & operator=(const WeakPointer & r)
{ return this->operator=( r.GetPointer() ); }
/** Overload operator assignment. */
WeakPointer & operator=(ObjectType *r)
{
m_Pointer = r;
return *this;
}
/** Function to print object pointed to. */
ObjectType * Print(std::ostream & os) const
{
if( this->IsNull() )
{
os << "(null)";
}
else
{
// This prints the object pointed to by the pointer
( *m_Pointer ).Print(os);
}
return m_Pointer;
}
private:
/** The pointer to the object referred to by this smart pointer. */
ObjectType *m_Pointer;
};
template< typename T >
std::ostream & operator<<(std::ostream & os, WeakPointer< T > p)
{
p.Print(os);
return os;
}
} // end namespace itk
#endif
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