LLVM 3.0 released [LWN.net]

LLVM 3.0 released

Posted Dec 12, 2011 4:18 UTC (Mon) by daglwn (subscriber, #65432)
In reply to: LLVM 3.0 released by paulj
Parent article: LLVM 3.0 released

Vala is certainly interesting, but it doesn't do everything C++ does, even ignoring the legacy stuff. I know it may not be stuff that you need but it is stuff I use a lot. For example, there is no true multiple inheritance in Vala. There's no pattern matching of generic classes, hence no metaprogramming. There's not complete static typing, which IMHO is a huge loss when trying to use a language for very large projects.

Vala is cool. I definitely see the value in it. But it isn't a replacement for C++.

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LLVM 3.0 released

Posted Dec 12, 2011 7:17 UTC (Mon) by paulj (subscriber, #341) [Link]

Vala does have multiple inheritance, or at least I don't see how its mixins are fundamentally any different:

http://live.gnome.org/Vala/Tutorial#Interfaces_.2BAC8_Mixins

Vala has generics. I'm not sure what aspect of C++ templates you miss, but I sure don't miss the multiple-pages or more of incomprehensible error messages that are inherent to even minor mistakes with C++ templates. ;)

Vala is statically typed, not sure why you'd think otherwise (it allows type inference of LHS in assignments with "var x = y;" - a handy convenience, and still statically typed).

LLVM 3.0 released

Posted Dec 12, 2011 10:11 UTC (Mon) by mpr22 (subscriber, #60784) [Link]

As that page describes it, Vala allows you to inherit at most one class and any number of interfaces (and the page explicitly says that it's a restricted form of multiple inheritance). C++ allows you to inherit multiple concrete classes. (It happens to be the case that I've never encountered a case where I thought I had a reason to use this capability, but I am not every C++ programmer.)

LLVM 3.0 released

Posted Dec 12, 2011 10:38 UTC (Mon) by paulj (subscriber, #341) [Link]

So, it's perhaps a little hidden away in one sentence of the last paragraph of that interface/mixin section, but Vala interfaces may contain concrete implementations. I.e. Vala has multiple inheritance - the only difference in Vala is that the classes being inherited from must mark themselves as being comfortable with that (not a fundamental difference).