On 09/24/2011 01:34 AM, Mehrdad wrote:
On 9/23/2011 4:13 PM, Jonathan M Davis wrote:
On Friday, September 23, 2011 15:58 Andrej Mitrovic wrote:
On 9/24/11, Peter Alexander<peter.alexander...@gmail.com> wrote:
On 23/09/11 6:48 AM, Walter Bright wrote:
On 9/22/2011 4:39 AM, bearophile wrote:
Walter:
"logical const" in C++ is faith-based programming.
I think you're exaggerating it's uselessness.
It's faith-based as much as 'walking down the street assuming that the
next person won't stab you' is faith-based. There's no guarantee, but
99% of the time your "faith" is well placed.
So then don't use const if u need caching and use convention if your
faith is well placed!
const in C++ really does help to catch bugs. It's definitely better than
nothing. I do _not_ think that it is worthless like Walter at least
gives the
impression that he thinks.
Now, I _do_ think that on the whole, D's const is better. The
transitiveness
of const is a major improvement IMHO, and the caching thing, while
annoying,
isn't that big a loss in my experience. I expect that with Peter's gaming
background, it's much more of an issue for him. I think that it's at
least
theoretically possible to get a caching mechanism to work with const,
which
would overcome that portion of the logical const problem, but the
question is
how best to do it and whether the added complication is worth the cost.
Certainly, it's the sort of thing that we should look into for D3 when
we get
that far. But for now, on the whole, D's const is a definite
improvement over
C++'s const, and you just don't use const in D in quite as many places
as you
would have in C++.
But while C++'s const is not as good as D's const, it's still very
worthwhile
IMHO.
- Jonathan M Davis
So far, the 5% of the code it breaks has made it 95% worthless for me,
though I'm not sure about others (would love to hear otherwise)...
If you are trying to use const in the same way as C++ const and you are
not using immutable in combination with const then you probably don't
use the feature properly. I don't know for sure if this is the case
though. Is it?
