std.variant and const

[Jonathan M Davis]

On Saturday 07 August 2010 05:42:53 Lutger wrote:
> Variant in phobos doesn't work well with being const, toHash and opEquals
> for example are not marked as const methods. I have tried to work around
> it with careful casting, but it is too unsafe and just too complex for
> something that is supposed to make life easier.
> 
> Does anybody know if this is a temporary problem with variant itself or
> related to other bugs or limitations? Should I file a bug report for this?
> I could only find this: http://d.puremagic.com/issues/show_bug.cgi?id=3795

The fact that Object is not const-correct is a huge problem. 
http://d.puremagic.com/issues/show_bug.cgi?id=1824 covers that, but I don't know 
when it's going to be fixed. http://d.puremagic.com/issues/show_bug.cgi?id=3748 
which deals with inout probably has to be fixed first.

So, I don't know whether there's really an issue with Variant itself, but the 
fact that functions like toHash() opEquals() aren't const is a big problem which 
is supposed to be addressed at some point but hasn't yet.

- Jonathan M Davis