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Re: Core chat... [message #12371 is a reply to message #12367]

Fri, 26 October 2007 18:47

mdelfede
Messages: 1313
Registered: September 2007

Ultimate Contributor

luzr wrote on Fri, 26 October 2007 14:01

But does not compile 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!

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

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

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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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