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Home » Developing U++ » U++ Developers corner » Core chat... (reference counted pointers etc.)
Re: Core chat... [message #12351 is a reply to message #12350] Thu, 25 October 2007 23:47 Go to previous messageGo to previous message
mdelfede is currently offline  mdelfede
Messages: 1308
Registered: September 2007
Ultimate Contributor
luzr wrote on Thu, 25 October 2007 23:38



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.



I don't get the point...
Quote:


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).


Yes, you got the true caveat of my way.... now maybe you understand *why* I do miss __property construct in c++.... Mad

Quote:



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

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



uh ? My Array class behaves exactly as yours, here...
Array<Ctrl> CreateWidgets()
{
    Array<Ctrl> x;  <== here, a single reference to memory object
    ...
    return x; <== here, for a while, 2 references to THE SAME memory object
}

ctrls = CreateWidgets() <== here, the first reference is destroyed, leaving a single reference in ctrls

In your pick_ behaviour, you have a single reference ever to a single memory object. In my case, I have just for a while 2 references to a single memory object, then the first one is released leaving the same result as yours.

Max

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