Can Someone explain Swift's Application Binary Stability in simple terms? - swift

I have tried looking up ABI Stability documentation on swift.org. I did not find it that useful as I am a very novice iOS Developer. I don't even understand what problem are they trying to solve and why is it really important for the maturity of the language?

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How to connect SystemC model with SystemVerilog?

Say we have a SystemC model of decade counter and I want to verify SystemVerilog Counter RTL using SystemC model. How can we connect these two in SV/UVM based testbench so as to communicate between them.
Mentor developed a free package called UVMConnect that was developed specifically for the application you are asking about. See https://verificationacademy.com/topics/verification-methodology/uvm-connect. You will need a simulator that supports SystemVerilog and SystemC simulating together, like Questa.
If you're using QuestaSim I think UVM-connect from Mentor is the way to go. When I first used it(4 years ago) it was very buggy and gave the most cryptic segfault errors I've ever seen. But, with help from the Mentor support I managed to overcome them and get stuff done. It should be more stable now, but if you have problems with it don't hesitate to contact Mentor support. They are very responsive.
However, if you're using Cadence tools and/or the e language I think that UVM-ML from Cadence is a much more comprehensive solution. It allows you to connect components written in any combination of languages(SV-SC, SV-e, SC-e) and it has nicer documentation and examples. I understand it's also compatible with all simulators now. You can find it here : http://forums.accellera.org/files/file/65-uvm-ml-open-architecture/
Not sure what Synopsis folks recommend for their tool suite. Maybe someone who used them can offer more information on this. But I'm guessing that both UVM-ML and UVM-Connect could work since their makers claim that they are portable.
And lastly, if you're planning to use SystemC as a verification language(very unlikely but just for the sake of diversity) there is something called UVM-SystemC which is basically a clone of SV-UVM written in C++/SystemC. It's currently in its alpha release and it lacks many features(register modeling, constrained randomization, coverage collection, etc.). It feels a lot like SV-UVM and I think it's a nice toy to play with in your spare time if you can't afford a commercial simulator license. You can find it here http://accellera.org/images/downloads/drafts-review/uvm-systemc-1.0-alpha1.tar.gz

How to write a code-generator/compiler

I would like to know how you would generate some kind of bytecode from an abstract syntax tree.
I've searched the internet but I cannot find anything helpful.
I've seen some mention of using templates but cannot find someone that actually explains what it is, how it works or how to implement it.
Just one thing though, I don't have any real programming experience and I'm completely self-taught so I'm not looking for an 800 page book on the theory of writing a compiler, I'm looking for something a little more practical, some kind of tutorial working through an actual example.
I learned a lot by following Let's Build a Compiler, by Jack Crenshaw many moons ago. It uses Turbo Pascal for implementation and generates 68000 assembler, so there is some steps to get it running on a modern host but it works through a lot of steps that is still valid.
Take a look at Kaleidoscope tutorial in LLVM: http://llvm.org/docs/tutorial/
and for a somewhat different perspective, http://community.schemewiki.org/?90min-scheme2c

Good Scala introductory article/video to whet the appetite

What are some good online articles or videos you've seen that would be most likely to get a developer interested in Scala? I'm looking for an introduction that is brief & to the point that dives right into example code, and would leave a developer who does not know Scala wanting to learn more about it.
Try in this order:
Pragmatic Real-World Scala - This video shows off all kinds of things that would make a Java developer drool.
Programming In Scala - This is simply a great general-purpose programming book. In addition to being a gentle, clear introduction to the language, it's also a fantastic introduction to functional programming concepts and language design. Even if you hate Scala,
this book will make you a better programmer.
Scala For Java Refugees - Very well-written mostly gentle introduction to major Scala concepts.
Another tour of Scala - A Java-centric breakdown of fundamental Scala features.
i went to this talk, it was excellent. can't tell if it is still there due to our internet restrictions, if it's not i'll delete this post.
http://powerhost.powerstream.net/008/00102/100203Scala.wmv
I'd go straight to the horse's mouth, the Scala website itself: Code Examples.
http://www.escalatesoft.com/screencasts
Escalate software is in the process of creating a series of screencasts for Scala information sharing and training purposes. The first available screencasts are provided here for free and cover the new features of Scala 2.8. In the longer term we will create training materials in the form of these videos along with supporting material that will be for sale from this and other sources as well.
http://blog.jaoo.dk/2009/03/09/an-introduction-to-the-scala-programming-language-by-bill-venners/
Take a look at the following presentation by Jonas Bonér (a well known figure in the Scala community, responsible for the AKKA actors concurrency framework). I'm sure this will whet the appetite for Scala.
http://www.infoq.com/presentations/Scala-Jonas-Boner
german introduction, maybe useful for you: http://www.rheinjug.de/videos/gse.lectures.app/Player.html#Scala
I would recommend Chapter 1. Zero to Sixty: Introducing Scala of the Programming Scala book by Dean Wampler and Alex Payne. The rest of the book is also great. The book is freely available online.
EDIT
I recently bought and read the Atomic Scala book by Bruce Eckel and Dianne Marsh. This is the best book I have read so far for anyone wanting to learn Scala.

How do I learn Scheme? [closed]

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Hey, I'm a relative newbie to programming. I've picked up some very basic Java (File I/O, GUIs, inheritance) and would like to take a look at functional programming - in particular, I would like to learn Scheme. I'm having some trouble finding a Scheme implementation I can understand. Interpreters are weird; I'm not sure how to save my programs and create executables. I've downloaded PLT Scheme, but I would prefer using something less condescending, something similar to NetBeans. Is there a plugin or tool that will allow me to quickly and easily create and manage Scheme programs? All help is appreciated!
some nice links for you
http://mitpress.mit.edu/sicp/
http://www.htdp.org/
both are course books. The courses with video lectures are available on the MIT opencourseware site.
http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/index.htm
I wish I had learned Lisp when I was 16. (I started programming commercially at that age.) I didn't learn it until I was nearly 40. Where I was once blind, now I can see. (Well, I can see a few inches ahead of me anyway.)
I second the idea that someone else here posted about learning Emacs.
One good way to learn any language is to go solve problems on projecteuler.net.
Try the book The Little Schemer, it provides an unconventional but yet easy to follow tutorial on Scheme, and in particular teaches you how to "think" recursively, which is essential in order to understand Scheme (and other functional programming languages).
Get DrRacket (Runs on any platform)
Get a book used from Amazon "The Scheme Programming Language" Cost $3.00 book $4.00 shipping
When you open open DrRacket use language from the pull-down menu.
enter
scheme
on the top of the script window and start on the exercises!
.....that's what I am doing now
SICP (Structure and Interpretation of Computer Programs) is sure a great book, but it is not necessary a good introduction to Scheme programming. Though, after some understanding of Scheme, reading SICP is recommended.
Learning to use Emacs as an editor would be useful. As a Scheme implementation I would recommend something like CHICKENscheme. Its manual describes for example how to deploy programs.
An alternative is a Scheme development environment like JazzScheme.
A good book for learning Scheme would be The Scheme Programming Language.
I think the docs for plt-scheme is quite nice http://docs.plt-scheme.org/ is worth reading
and also: write code, write code, write code
Maybe this isn't the best answer but one of things I have found over the years is that a lot of new programmers get pulled in too many directions. If you are just starting out the best thing you can do (my opinion) is to learn one programming language really well. If possible I would try to make this the language you are working in, if you are not working in a programming job then I would try to pick a language with the best prospect of getting a job. Once you have mastered this one language then learning other languages will help enhance your already solid foundation and help make you an exceptional programmer.
Don't get me wrong, learning Scheme is a great thing to do but until you have mastered one language you will have a harder time moving up the ranks and landing that perfect job. In the end most companies are looking to hire the guru's, make sure you are in this group.
I took a programming languages course in college that was done entirely in Scheme, and the textbook we used is "Programming Languages: Application and Interpretation" by Shriram Krishnamurthi, one of the guys who helped write DrScheme. The textbook is available freely online. I found the book to be really helpful and informative when trying to understand the arcane mysticism of Scheme.
A nice beginner intro to Lisp is Common Lisp First Contact
Not a heavyweight course like SICP mentioned above, but a gentle introduction
to the syntax, features and oddities of Common Lisp in a nicely formatted PDF
optimized for screen reading.
Well I can't help You much with the tools. I tried MIT implementation and got a bit lost too, but I'd like to recommend a book which is a great source of knowledge about programming in general and uses scheme for illustrating ideas. If You din't come across this one yet, You have to check SICP
If Java environment is already comfortable for you, then probably the best way is to use Scheme implementations that run on top of JVM. For educational purposes SISC is more than enough:
http://sisc-scheme.org/
Alternatively, you could use Kawa or Bigloo.
If you're up to learning functional ways, and not necessarily bound to Scheme, then probably Clojure would be a right choice.

Please suggest direction for my small scala project

As a academic project of 6 months in college me and my 3 friends are going to implement "Distributed Caching" in scala language.
Being new to both of these concepts and this being our first project I would be really happy if you guys could provide some direction.
I am currently learning scala.
Please let me know which particular features of language to be learned for this particular project.
Any online resources for learning distributed caching.
thanks in advance
You could have a look at Terracotta and especially at its uses in implementing Distributed Caching. You could have a look at the source code of the open source edition of Terracotta. Also, you could even consider Terracotta as your framework for building the distributed cache. I don't have any personal experience in using Terracotta with Scala, but it has been done.
Features of the language... Try starting with the Programming in Scala book. It's a very good resource. If you want to do any concurrency you will have to be proficient in using Actors. I would recommend having a look over all the features of Scala. Each one has its uses and you will need to know at least a bit of them to recognise situations in which to use their power. :)
-- Flaviu Cipcigan
You might want to look at the project Velocity page.
In MSDN also there is an article about distributed caching in general.
I'm not sure, but I think the Akka project might is already doing what you're looking for (and a whole lot more). Perhaps you can take inspiration from that.