<br>Hi Peter,<br><br>This is a very interesting (and very useful) question.<br><br>You already pointed out some of the critical points,<br>so let me just expand in the following list:<br><br>For a new class to be able to use ITK SmartPointers<br>
you should:<br><br><br>1) Derive from the itk::LightObject<br><br>2) Implement the New() operator.<br>
This can be done by simply using the<br>
itkNewMacro( Self ),<br>
and of course, declaring the "Self" type.<br>
<br>3) Have a protected default constructor<br> (constructor without arguments)<br><br>4) Have a protected destructor<br><br>5) Have a private declaration of the <br> copy constructor (and not implement it)<br><br>
6) Have a private declaration of the<br> operator=(), (and not implement it)<br><br><br><br>Note that items (3,4,5,6) are not really "requirements"<br>for getting the SmartPointer to work, they are actually<br>
intended to prevent users from misusing the class.<br>For example, they make impossible for you to use the<br>"new" operator, and therefore enforce the use of New().<br><br>Note that the class doesn't have to be put inside the<br>
"itk" namespace (although you could do it, if you find<br>it useful).<br><br><br>Here is the minimal example of a class that<br>uses ITK Smart Pointers:<br><br>--------------------------------------------------------<br>
#include "itkLightObject.h"<br>#include "itkObjectFactory.h"<br><br>class MyClass : public itk::LightObject<br>{<br>public:<br> typedef MyClass Self;<br> typedef itk::SmartPointer< Self > Pointer;<br>
typedef itk::SmartPointer< const Self > ConstPointer;<br><br> itkNewMacro( Self );<br><br>protected:<br> MyClass() {}<br> virtual ~MyClass() {}<br><br>private:<br> MyClass( const Self & ); // not implemented<br>
const Self & operator=( const Self & ); // not implemented<br>};<br><br><br>int main()<br>{<br> MyClass::Pointer foo = MyClass::New();<br> return 0;<br>}<br>--------------------------------------------------------<br>
<br><br><br> Regards,<br><br><br> Luis<br><br><br>-----------------------------------------------------------------------------<br><div class="gmail_quote">On Thu, Apr 15, 2010 at 8:25 PM, Pete79 <span dir="ltr"><<a href="mailto:pkoniusz@hotmail.com">pkoniusz@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Dear all.<br>
<br>
Can you give me a simple example how to wrap my own class to provide it with<br>
Smart Pointer functionality? So far I've gathered I really need to inherit<br>
from the LightObject class, what next?<br>
<br>
Let's say I have got the following:<br>
class MyClass: public LightObject<br>
{<br>
private:<br>
int member;<br>
public:<br>
MyClass(int memberC) : member(memberC) {}<br>
~MyClass() { do something; }<br>
};<br>
<br>
How can I wrap it up with SmartPointer?<br>
<br>
typedef typename SmartPointer<MyClass> MyClassSPT;<br>
<br>
What else?<br>
When I instantiate it with:<br>
MyClassSPT aaa=MyClass::New() it won't work fine I guess coz the constructor<br>
of MyClass takes a parameter as its argument.<br>
<br>
Can you give me the tips and snippets of the code which show how to deal<br>
with it?<br>
<br>
Many thanks,<br>
Peter<br>
<br>
<br>
--<br>
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