On 03/25/2010 11:57 AM, Lars T. Kyllingstad wrote:
Andrei Alexandrescu wrote:
On 03/25/2010 11:17 AM, bearophile wrote:
Andrei Alexandrescu:
The problem is it asks you to insert casts all too often. I think the
value range propagation is a principled and correct solution to that
problem.
In bugzilla I have asked to disable the implicit conversion enum =>
base type in an equality test, see:
http://d.puremagic.com/issues/show_bug.cgi?id=3999
In bugzilla I have never asked to disable implicit signed => unsigned
casts, I am able to see they are two quite different situations.
I think the implicit conversions from enum => base types are uncommon
enough, so they can't introduce too many casts.
If Walter doesn't agree with me (and few other people here) then
there's no point in keeping bug 3999 open, it can be closed. Because
it's better to fix/change similar things now, when the D2 language is
not diffused yet. Later such changes are harder to do.
In bugzilla there are few other things that deserve a similar look.
Those changes can't be done all at the same time, but the decision
can be taken in a short enough time, and it's better to think about
them now.
Bye and thank you for your attention,
bearophile
I think defining a integral() function that gives the value of the
enum as an appropriately-typed integral number wouldn't harm.
Andrei
Why not let to!int() do this?
-Lars
Because an enum that uses long as a base will not be converted.
integral() would automatically deduce and return the appropriate base type.
Andrei
