Adding support for this makes the type system more expressive in a theoretical sense, but as a practical matter it makes the language less usable because errors get detected later. On the other hand, as Abadi and Cardelli demonstrated so well with their Object Calculus, sometimes the practice comes first and the rigor later.
The more powerful the feature; the more room for hanging your self; because the more power they give you the more room abuse that power!
Also, as I mentioned in one of my posts, the type-theoretic statically checked languages tend to impose a kind of type-oriented programming style, which may not always be desirable. Could you outline that? By fruehr at Thu, My original post, which started this thread, was aimed at arguing the benefits of having some knowledge of type theory and type systems, independent of statically vs.
Part of my interest in this discussion comes from a belief supported by some evidence in the Scheme world that a middle ground is possible. By Philippa Cowderoy at Fri, The answer, I think, is not enough to rise to the level of "must have".
Finally, I guess I have to deal with this: IME one of the most important sources of problems in large projects more than 4 people for more than 3 months is communicating the contracts of programs. When I can download them and use them, I stop saying "are going to be. But your example is a popular one in dependent-typing circles, where the discussion of a "sorted" type that expresses the order invariant of the values is feasible.
Unless, of course, you were to do the integration yourself: Mea culpa, mea culpa, mea maxima culpa. In any case, Zelazny has Thoth sowing monsters before Set the Destroyer throughout eternity, as distractions from his otherwise imminent self-destruction.
Maybe posters will notice on the second try. This is another great point that I wish to ensure readers know that I recognize as valid.
By Kevin Millikin at Tue, I find it very irritating that people continually bias their arguments for untyped languages in this fashion, as if typed languages need to "catch up" or something. Anyway, the promised point here is this eternal back-and-forth dance also rather smacks of game theory, which undoubtedly provides other useful perspectives on the whole typing issue.
A Verified Implementation of Scheme as an existence proof. What I see is the same decade-old handwaving about how the Univ-based code that you write in an untyped language is awkward to express in a statically-typed language.
Staticly typed code in Scheme is no more inconvenient than untyped code in ML. If you want to write all your code in a single strictly-imposed style, both OOP and TOP are reasonable choices other things being equal, which of course they never are. None of the dynamic language guys have ever claimed to be able to observe all cases.
There are cases where the effort required to correctly prevent the [security] violation at runtime is much harder than the statically inferred properties.
The problem with that is that it might be a non-trivial time commitment to do so. At least I do.Select your preferred way to display the comments and click "Save settings" to activate your changes.
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What do you think of C++11? That's a (to me) amazingly frequent question. It may be the most frequently asked question. Surprisingly, C++11 feels like a new language: The pieces just fit together better than they used to and I find a higher-level style of programming more natural than before and as efficient as ever.
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