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by brehaut
5836 days ago
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You seem to have a much better handle on things than i so i'll take your word for it. > I have no idea about the hurdles Clojure on top of .NET is facing, but if it isn't ported by now it's more likely because Rich Hickey and the other core contributors don't have a strong interest for it. found a quote that i was thinking of when wrote that first comment rhickey: cemerick: depends
cemerick: erasure is the best thing ever
cemerick: yeah; I caught a glimpse of what D. Miller is having to deal with
with ClojureCLR, and felt bad for him.
rhickey: cemerick: yes, people don't realize the huge tradeoff involved in
the CLR approach. It greatly complicates life for everyone, and is
a poor fit for dynamic langs
-- http://clojure-log.n01se.net/date/2010-06-01.html#i30 |
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I guess the more static typing you have to deal with when generating bytecode, the harder it is for dynamic language writers.
Still, generics are used to great effect in the DLR for the call-sites inline caches ... like when you have a "doSomething(x, 2)" ... you know that "2" is an integer constant, and the generated call-site method that does the inline caching (to avoid hash-lookups) is using an "int" as the second parameter ... they can do that because method references are getting specialized so you can avoid boxing/unboxing for obvious cases, like passing integer/double constants.
[EDIT]
The MethodHandler from OpenJDK's invokedynamic proposal is a light-weight method reference, resembling System.Reflection.Emit.DynamicMethod from dotNet. MethodHandler will be used for call-sites and I think MethodHandler also gets reified.
The thing I don't like about the JVM are the inconsistencies ... you've got primitive types, but you can't define your own. Arrays are reified (and now MethodHandlers too) ... but you have no way to have your own reified generic data-structures.
Still ... in the long-run I think the JVM is a better platform than .NET ... if only Oracle would not stagnate it (or maybe now that it's open-source, some fork might be in order ... but I don't think it's doable unless it's a big company with lots of resources ... maybe Google, but I'm not holding my breath).