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include
itkSmartPointer.h
Go to the documentation of this file.
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/*=========================================================================
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*
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* Copyright Insight Software Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*=========================================================================*/
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#ifndef __itkSmartPointer_h
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#define __itkSmartPointer_h
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#include <iostream>
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namespace
itk
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{
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template
<
class
TObjectType >
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class
SmartPointer
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{
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public
:
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typedef
TObjectType
ObjectType
;
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SmartPointer
()
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{
m_Pointer
= 0; }
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SmartPointer
(
const
SmartPointer< ObjectType >
& p):
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m_Pointer
(p.
m_Pointer
)
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{ this->
Register
(); }
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SmartPointer
(
ObjectType
*p):
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m_Pointer
(p)
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{ this->
Register
(); }
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~SmartPointer
()
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{
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this->
UnRegister
();
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m_Pointer
= 0;
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}
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ObjectType
*
operator->
()
const
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{
return
m_Pointer
; }
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operator
ObjectType
*()
const
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{
return
m_Pointer
; }
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bool
IsNotNull
()
const
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{
return
m_Pointer
!= 0; }
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bool
IsNull
()
const
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{
return
m_Pointer
== 0; }
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template
<
typename
TR >
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bool
operator==
(TR r)
const
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{
return
(
m_Pointer
== static_cast< const ObjectType * >( r ) ); }
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template
<
typename
TR >
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bool
operator!=
(TR r)
const
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{
return
(
m_Pointer
!= static_cast< const ObjectType * >( r ) ); }
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ObjectType
*
GetPointer
()
const
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{
return
m_Pointer
; }
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bool
operator<
(
const
SmartPointer
& r)
const
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{
return
(
void
*)
m_Pointer
< (
void
*)r.
m_Pointer
; }
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bool
operator>
(
const
SmartPointer
& r)
const
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{
return
(
void
*)
m_Pointer
> (
void
*)r.
m_Pointer
; }
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bool
operator<=
(
const
SmartPointer
& r)
const
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{
return
(
void
*)
m_Pointer
<= (
void
*)r.
m_Pointer
; }
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bool
operator>=
(
const
SmartPointer
& r)
const
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{
return
(
void
*)
m_Pointer
>= (
void
*)r.
m_Pointer
; }
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// cppcheck-suppress operatorEqVarError
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SmartPointer
&
operator=
(
const
SmartPointer
& r)
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{
return
this->
operator=
( r.
GetPointer
() ); }
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SmartPointer
&
operator=
(
ObjectType
*r)
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{
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if
(
m_Pointer
!= r )
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{
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ObjectType
*tmp =
m_Pointer
;
//avoid recursive unregisters by retaining
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// temporarily
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m_Pointer
= r;
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this->
Register
();
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if
( tmp ) { tmp->UnRegister(); }
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}
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return
*
this
;
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}
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ObjectType
*
Print
(std::ostream & os)
const
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{
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// This prints the object pointed to by the pointer
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( *m_Pointer ).Print(os);
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return
m_Pointer
;
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}
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private
:
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ObjectType
*
m_Pointer
;
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void
Register
()
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{
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if
(
m_Pointer
) {
m_Pointer
->Register(); }
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}
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void
UnRegister
()
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{
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if
(
m_Pointer
) {
m_Pointer
->UnRegister(); }
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}
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};
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template
<
typename
T >
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std::ostream & operator<<(std::ostream & os, SmartPointer< T > p)
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{
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p.Print(os);
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return
os;
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}
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}
// end namespace itk
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#endif
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