On Wednesday, 18 June 2014 at 02:00:37 UTC, Justin Whear wrote:
On Wed, 18 Jun 2014 01:31:32 +0000, Sebastian Unger wrote:
Hi there,
I'm an experient C++ developer and am trying to switch to /
learn D.
What I've seen so far is mostly quite straight forward and
VERY nice.
There's only one catch so far for me for which Googling has
only found
the discouraging answer of: It can't be done in D.
I have two classes A and B. Each object of class A is
associated with a
particular object of class B. This association is not supposed
to change
throughout the lifetime of the object of A.
How am I supposed to express this in D, given that D's const
is too
strong for this? I don't need any guarantees from the const
that can be
used for thread safety or parallelisation. All I need is the
compiler
not letting me change the reference to the B object inside the
A object.
Does D have some way of expressing this?
Or has D really done away with the MOST important use case of
const
(preventing developer mistakes! Not optimization.)
Cheers,
Seb
I think you may be mixing up const and immutable. What do you
mean about
const being too strong?
It seems that does what you want:
class A
{
const B bff;
this(B bestBuddy)
{
bff = bestBuddy;
}
}
You missed the point about A needing to modify B. I want to
express a constant relationship between objects, not that A or B
are constant.
Cheers,
Seb
