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Home » Developing U++ » U++ Developers corner » Proposed change to U++ to allow owning children.
Re: Proposed change to U++ to allow owning children. [message #31696 is a reply to message #31695] |
Sun, 20 March 2011 14:28 |
Lance
Messages: 549 Registered: March 2007
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Contributor |
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It just come to me that we can change the interface slightly to make it unnecessary/impossible for end users to use new directly.
Add a template member function to the Ctrl class
class Ctrl...
{
...
bool owned : 1;
....
protected:
bool IsOwned()const{ return owned; }
Ctrl& Owned(bool v){ owned=v; return *this; }
public:
template <typename ChildType>
ChildType& AddOwned()
{
ChildType* p=new ChildType();
p->Owned();
(void)Add(p);
return *p;
}
template <typename ChildType, typename T>
ChildType& AddOwned(T& t)
{
ChildType* p=new ChildType(t);
p->Owned();
(void)Add(p);
return *p;
}
// return ChildType so that user can further set its
// properties.
// The IsOwned and Owned functions will be demoted to protected
// so that they are available only to libary developers
//
// whether a child is owned is a one time decision.
// an owned child will not be able to be reverted to unowned
// by end user (without derive from the Ctrl class or its
// derivatives), but he/she is free to change parents for it
//
// Unless the end user uses some hackish practice,
// library developers can be assured the owned flag
// is reliable and predictable.
};
[Updated on: Sun, 20 March 2011 15:17] Report message to a moderator
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Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 17:18
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Wed, 16 March 2011 17:26
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 17:29
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 17:30
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 17:39
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Wed, 16 March 2011 18:01
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 18:10
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 18:29
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 18:35
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 18:43
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 16 March 2011 19:24
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 02:13
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Fri, 18 March 2011 11:01
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 14:39
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 15:21
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 15:40
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 16:22
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 16:34
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Re: Proposed change to U++ to allow owning children.
By: mirek on Fri, 18 March 2011 19:35
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Re: Proposed change to U++ to allow owning children.
By: mirek on Fri, 18 March 2011 19:32
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 23:02
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Re: Proposed change to U++ to allow owning children.
By: mirek on Fri, 18 March 2011 23:18
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Re: Proposed change to U++ to allow owning children.
By: Lance on Fri, 18 March 2011 23:34
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Re: Proposed change to U++ to allow owning children.
By: mirek on Fri, 18 March 2011 23:40
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sat, 19 March 2011 00:02
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Re: Proposed change to U++ to allow owning children.
By: mirek on Sat, 19 March 2011 00:37
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sat, 19 March 2011 01:30
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sat, 19 March 2011 01:35
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Re: Proposed change to U++ to allow owning children.
By: mirek on Sat, 19 March 2011 10:59
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Sun, 20 March 2011 10:32
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sun, 20 March 2011 14:07
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sun, 20 March 2011 14:11
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sun, 20 March 2011 14:28
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Fri, 25 March 2011 13:26
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Re: Proposed change to U++ to allow owning children.
By: Lance on Sun, 27 March 2011 15:33
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Sun, 17 April 2011 17:25
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Re: Proposed change to U++ to allow owning children.
By: Lance on Tue, 19 April 2011 06:00
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Tue, 19 April 2011 09:14
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Re: Proposed change to U++ to allow owning children.
By: Lance on Tue, 19 April 2011 14:09
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Tue, 19 April 2011 18:05
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 20 April 2011 02:44
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Wed, 20 April 2011 08:51
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 20 April 2011 19:24
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 20 April 2011 21:17
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 20 April 2011 21:23
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Re: Proposed change to U++ to allow owning children.
By: Lance on Wed, 20 April 2011 21:38
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Re: Proposed change to U++ to allow owning children.
By: kohait00 on Thu, 28 April 2011 16:32
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revised ownership change
By: kohait00 on Thu, 28 April 2011 18:28
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Re: revised ownership change
By: Lance on Thu, 28 April 2011 21:45
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Re: revised ownership change
By: kohait00 on Thu, 28 April 2011 21:57
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Re: revised ownership change
By: Lance on Thu, 28 April 2011 23:18
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Re: revised ownership change
By: Lance on Thu, 28 April 2011 23:31
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Re: revised ownership change
By: Lance on Thu, 28 April 2011 23:54
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Re: revised ownership change
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Re: revised ownership change
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Re: revised ownership change
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Re: revised ownership change
By: Lance on Mon, 06 June 2011 05:11
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Re: revised ownership change
By: Lance on Mon, 06 June 2011 05:05
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