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Re: Core chat... [message #12376 is a reply to message #12371]

Fri, 26 October 2007 22:12

mirek is currently offline

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

mdelfede wrote on Fri, 26 October 2007 12:47

luzr wrote on Fri, 26 October 2007 14:01

But does not compile Smile

Smile

Your template needs deep public copy constructor for T, even if it is not actually used (because reference count is always 1 for COW ops).

Quote:

and I can tell you that if you forget the & you have double controls on screen!

Smile

Sounds like a possible solution, but in that case you need to solve the quite complex problem of polymorphic copy - and all that only to make flawed code working somehow.

Well, thinking a bit more about it.... I have the solution : put dummy copy constructors in Ctrl class, that throw an exception or fail an assert... So :
1- You're sure that you don't use the copy-on-write for classes you don't want to.
2- You must not write some cumbersome polymorphic class copy constructor.
Copy constructors *are* there, so my previous example does work Very Happy

Very Happy

So, the solution (with refcounted classes) is to displace the error from picked array to copy constructor Very Happy

Very Happy

Now I am not quite sure if this is meant as joke or not Smile

Smile

(Note that classes like Ctrl derive from NoCopy, which makes it copy constructor private to catch its misuse at compile time).

Mirek

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[Message index]

		Core chat... (reference counted pointers etc.) By: mirek on Tue, 23 October 2007 23:48
		Re: Core chat... By: cbpporter on Wed, 24 October 2007 15:30
		Re: Core chat... By: mirek on Wed, 24 October 2007 16:37
		Re: Core chat... By: cbpporter on Wed, 24 October 2007 16:44
		Re: Core chat... By: mdelfede on Wed, 24 October 2007 17:46
		Re: Core chat... By: mirek on Wed, 24 October 2007 18:23
		Re: Core chat... By: mdelfede on Wed, 24 October 2007 20:24
		Re: Core chat... By: mirek on Wed, 24 October 2007 22:05
		Re: Core chat... By: mdelfede on Wed, 24 October 2007 23:36
		Re: Core chat... By: mirek on Thu, 25 October 2007 05:33
		Re: Core chat... By: mdelfede on Thu, 25 October 2007 14:06
		Re: Core chat... By: mirek on Thu, 25 October 2007 14:34
		Re: Core chat... By: mdelfede on Thu, 25 October 2007 15:19
		Re: Core chat... By: mirek on Thu, 25 October 2007 18:02
		Re: Core chat... By: mdelfede on Thu, 25 October 2007 19:52
		Re: Core chat... By: mirek on Thu, 25 October 2007 21:33
		Re: Core chat... By: mdelfede on Thu, 25 October 2007 23:26
		Re: Core chat... By: mirek on Thu, 25 October 2007 23:38
		Re: Core chat... By: mdelfede on Thu, 25 October 2007 23:47
		Re: Core chat... By: mirek on Fri, 26 October 2007 09:36
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 12:13
		Re: Core chat... By: mirek on Fri, 26 October 2007 12:42
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 13:03
		Re: Core chat... By: mirek on Fri, 26 October 2007 14:01
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 14:18
		Re: Core chat... By: mirek on Fri, 26 October 2007 22:09
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 23:13
		Re: Core chat... By: mirek on Fri, 26 October 2007 23:51
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 18:47
		Re: Core chat... By: mirek on Fri, 26 October 2007 22:12
		Re: Core chat... By: mdelfede on Fri, 26 October 2007 23:09
		Re: Core chat... By: mirek on Fri, 26 October 2007 23:55
		Re: Core chat... By: mdelfede on Sat, 27 October 2007 11:08
		Re: Core chat... By: mirek on Sat, 27 October 2007 11:16
		Re: Core chat... By: mdelfede on Sat, 27 October 2007 13:06
		Re: Core chat... By: mirek on Sat, 27 October 2007 14:50
		Re: Core chat... By: mdelfede on Sat, 27 October 2007 15:21
		Re: Core chat... By: mirek on Sat, 27 October 2007 16:02
		Re: Core chat... By: mdelfede on Sat, 27 October 2007 16:28
		Re: Core chat... By: sergei on Wed, 24 October 2007 19:49
		Re: Core chat... By: mdelfede on Wed, 24 October 2007 20:06
		Re: Core chat... By: mirek on Wed, 24 October 2007 21:46

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