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Re: Core chat... [message #12350 is a reply to message #12348]

Thu, 25 October 2007 23:38

mirek is currently offline

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

mdelfede wrote on Thu, 25 October 2007 17:26

luzr wrote on Thu, 25 October 2007 21:33

You can try. However, long time ago, such class template was part of U++. But there was no use for it. "pick" is confusing at first, but quite powerful concept.

I do find "pick" quite clear. You get the top performance at at the expense of some loss of easy to use stuff.

Well, performance is nice, but really not that important.

What IS imporant is that there is only ONE PLACE where instance of (possibly) non-copyable object can exist.

Quote:

array<int> a, b;
a.At(1000) = 1;
b = a;      <== b and a share same memory area
a[10] = 2;  <== here an automatic deep copy, ok
b[10] = 2;  <== here no deep copy, just array access, ok

Note that above is impossible to implement reliably in C++ (as long as you want read operator[] access to perform no copy at all).

Quote:

array a gets 2 references to it for a while, just when MyFunc returns a value. Then, temporary from MyFunc get destroyed, leaving a with a single reference. Any subsequent access to a[] don't need a deep copy.

Sure. Anyway, the real point of pick is here:

Array<Ctrl> CreateWidgets()
{
    Array<Ctrl> x;
    ...
    return x;
}

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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