/usr/include/ITK-4.5/itkSmartPointer.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 __itkSmartPointer_h
#define __itkSmartPointer_h
#include <iostream>
namespace itk
{
/** \class SmartPointer
* \brief Implements transparent reference counting.
*
* SmartPointer implements reference counting by overloading
* operator -> (and *) among others. This allows natural interface
* to the class referred to by the pointer without having to invoke
* special Register()/UnRegister() methods directly.
*
* To compile / test this class
* Windows: cl SmartPointerTest.cxx; .\\SmartPointerTest.exe
* linux: c++ SmartPointerTest.cxx ./a.out
* other: CCcompiler SmartPointerTest.cxx ./a.out
*
* \ingroup ITKSystemObjects
* \ingroup DataAccess
* \ingroup ITKCommon
*/
template< typename TObjectType >
class SmartPointer
{
public:
typedef TObjectType ObjectType;
/** Constructor */
SmartPointer ()
{ m_Pointer = 0; }
/** Copy constructor */
SmartPointer (const SmartPointer< ObjectType > & p):
m_Pointer(p.m_Pointer)
{ this->Register(); }
/** Constructor to pointer p */
SmartPointer (ObjectType *p):
m_Pointer(p)
{ this->Register(); }
/** Destructor */
~SmartPointer ()
{
this->UnRegister();
m_Pointer = 0;
}
/** Overload operator -> */
ObjectType * operator->() const
{ return m_Pointer; }
/** Return pointer to object. */
operator ObjectType *() const
{ return m_Pointer; }
/** Test if the pointer has been initialized */
bool IsNotNull() const
{ return m_Pointer != 0; }
bool IsNull() const
{ return m_Pointer == 0; }
/** Template comparison operators. */
template< typename TR >
bool operator==(TR r) const
{ return ( m_Pointer == static_cast< const ObjectType * >( r ) ); }
template< typename TR >
bool operator!=(TR r) const
{ return ( m_Pointer != static_cast< const ObjectType * >( r ) ); }
/** Access function to pointer. */
ObjectType * GetPointer() const
{ return m_Pointer; }
/** Comparison of pointers. Less than comparison. */
bool operator<(const SmartPointer & r) const
{ return (void *)m_Pointer < (void *)r.m_Pointer; }
/** Comparison of pointers. Greater than comparison. */
bool operator>(const SmartPointer & r) const
{ return (void *)m_Pointer > (void *)r.m_Pointer; }
/** Comparison of pointers. Less than or equal to comparison. */
bool operator<=(const SmartPointer & r) const
{ return (void *)m_Pointer <= (void *)r.m_Pointer; }
/** Comparison of pointers. Greater than or equal to comparison. */
bool operator>=(const SmartPointer & r) const
{ return (void *)m_Pointer >= (void *)r.m_Pointer; }
/** Overload operator assignment. */
// cppcheck-suppress operatorEqVarError
SmartPointer & operator=(const SmartPointer & r)
{ return this->operator=( r.GetPointer() ); }
/** Overload operator assignment. */
SmartPointer & operator=(ObjectType *r)
{
if ( m_Pointer != r )
{
ObjectType *tmp = m_Pointer; //avoid recursive unregisters by retaining
// temporarily
m_Pointer = r;
this->Register();
if ( tmp ) { tmp->UnRegister(); }
}
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;
void Register()
{
if ( m_Pointer ) { m_Pointer->Register(); }
}
void UnRegister()
{
if ( m_Pointer ) { m_Pointer->UnRegister(); }
}
};
template< typename T >
std::ostream & operator<<(std::ostream & os, SmartPointer< T > p)
{
p.Print(os);
return os;
}
} // end namespace itk
#endif
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