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• -1 as a return value

  - by dimadima

  This question is specifically about PHP, but I'm guessing it might be applicable to other languages as well. I've noticed that between PHP4 and PHP5, the designers of the language shifted away from using -1 as a return value to using constants or other forms of output. This makes sense, as -1 is not particularly evocative, and I'm guessing this practice led to confusion. That said, I am sometimes inclined to return -1 when I want to quickly add another return option to a function, and -1 often seems like a perfectly valid way to express the outcome I am coding for. So here are my questions: Is my observation generally correct, regarding the move away from -1 as a return value in PHP5 vs PHP4? What are the cons of returning -1, beyond for the reason I mentioned above, wherein the -1 return value doesn't contribute positively to code clarity?

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• C++ domain specific embedded language operators

  - by aaa

  hi. In numerical oriented languages (Matlab, Fortran) range operator and semantics is very handy when working with multidimensional data. For example: A(i:j,k,:n) // represents two-dimensional slice B(i:j,0:n) of A at index k unfortunately C++ does not have range operator (:). of course it can be emulated using range/slice functor, but semantics is less clean than Matlab. I am prototyping matrix/tensor domain language in C++ and am wondering if there any options to reproduce range operator. I still would like to rely on C++/prprocessor framework exclusively. So far I have looked through boost wave which might be an suitable option. is there any other means to introduce new operators to C++ DSL?

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• PHP vs JSP Which is should I use/learn for my project?

  - by Jon

  I'm planning on making a fitness planning web application for my senior project at school. However, I don't know anything about either technology and my only experience with web development previously was with python and django. I was wondering what people might recommend to learn, what is most useful to learn for the job market, and what would be best for this project. If it matters, the programming languages I know are, C, C++, Java, and Python. My goal of the project is to learn technologies that will make me a more marketable person. Thanks

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• How do you run your unit tests? Compiler flags? Static libraries?

  - by Christopher Gateley

  I'm just getting started with TDD and am curious as to what approaches others take to run their tests. For reference, I am using the google testing framework, but I believe the question is applicable to most other testing frameworks and to languages other than C/C++. My general approach so far has been to do either one of three things: Write the majority of the application in a static library, then create two executables. One executable is the application itself, while the other is the test runner with all of the tests. Both link to the static library. Embed the testing code directly into the application itself, and enable or disable the testing code using compiler flags. This is probably the best approach I've used so far, but clutters up the code a bit. Embed the testing code directly into the application itself, and, given certain command-line switches either run the application itself or run the tests embedded in the application. None of these solutions are particularly elegant... How do you do it?

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• Generating dynamic C# based on textual data into the runtime?

  - by WeNeedAnswers

  Is there a quick and easy way to load textual C# into a program. I would like to load the LINQ from the database as an Expression and run it against some data (SQL or Array/List don't mind). I know I can do it using the C# CodeDom/ExpressionTree builder with Assembly Loading and Creating AppDomains, but this seems very long winded. Is there an easier way. I thought with the advent of .net 3.5 that the ExpressionTree would come to my aid, but I now realise that I have to write a parser to use this. Maybe there is a new trick in 4.0? Something along the lines of a dynamic languages Parse would be great. Any suggestions greatly appreciated.

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• Process every pair in a sequence

  - by Henry Jackson

  I'm looking for a concise way to process every (unordered) pair of elements in a sequence in .NET. I know I can do it with nested foreach loops, but I was looking for something a little more readable. I was imagining something like a modified Any() extension method: IEnumerable<Transaction> transactions = ... if (transactions.AnyPair( (first, second) => first.UniqueID == second.UniqueID)) throw ... Or maybe a foreach-style one: IEnumerable<JigsawPiece> pieces = ... pieces.ForEachPair( (first, second) => { TryFit(first, second); }); This question has been asked for other languages (e.g. see http://stackoverflow.com/questions/942543/operation-on-every-pair-of-element-in-a-list), but I'm looking for a .NET solution.

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• Get local network interface addresses using only proc?

  - by Matt Joiner

  How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I've discovered the following: ifconfig makes use of SIOCGIFADDR, which requires open sockets and advance knowledge of all the interface names. It also isn't documented in any manual pages on Linux. proc contains /proc/net/dev, but this is a list of interface statistics. proc contains /proc/net/if_inet6, which is exactly what I need but for IPv6. Generally interfaces are easy to find in proc, but actual addresses are very rarely used except where explicitly part of some connection. There's a system call called getifaddrs, which is very much a "magical" function you'd expect to see in Windows. It's also implemented on BSD. However it's not very text-oriented, which makes it difficult to use from non-C languages.

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• Implementation communication protocols in C/C++

  - by MeThinks

  I am in the process of starting to implement some proprietary communication protocol stack in software but not sure where to start. It is the kind of work I have not done before and I am looking for help in terms of resources for best/recommended approaches. I will be using c/c++ and I am free to use use libraries (BSD/BOOST/Apache) but no GPL. I have used C++ extensively so using the features of C++ is not a problem. The protocol stack has three layers and it is already fully specified and formally verified. So all I need to do is implemented and test it fully in the specified languages. Should also mention that protocol is very simple but can run on different devices over a reliable physical transport layer Any help with references/recommendations will be appreciated. I am willing to use a different language if only to help me understand how to implement them but I will have to eventually resort to the language of choice.

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• erlang io:format, and a hanging web application

  - by williamstw

  While I'm learning a new language, I'll typically put lots of silly println's to see what values are where at specific times. It usually suffices because the languages typically have available a tostring equivalent. In trying that same approach with erlang, my webapp just "hangs" when there's a value attempted to be printed that's not a list. This happens when variable being printed is a tuple instead of a list. There's no error, exception, nothing... just doesn't respond. Now, I'm muddling through by being careful about what I'm writing out and as I learn more, things are getting better. But I wonder, is there a way to more reliably to [blindly] print a value to stdout? Thanks, --tim

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• Localization not working

  - by Krumelur

  I have an application that is supposed to be localized (two languages, english being the default). However, I seem to only get the English versions of all strings, regardless of what the system default language is. I am probably missing something trivial, but I've read several tutorials now without any solution. I added this line to main(), NSLog(@"Current locale is: %@", [[NSLocale currentLocale] localeIdentifier]); and the resulting printout is en_US, while the system was set to use the localized language. I checked the build output, and the app bundle contains the XX.lproj folders as I believe they should (and they are UTF-16, I confirmed this). What am I missing?

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• Need Language/Career Path Advice

  - by Cain

  I am interested in getting a few Microsoft Certs and I am currently facing the option for .NET Framework app development language. My choices are C++, C#, and Visual Basic. I have some experience with Java and Visual Basic .NET but I honestly would like to know what the best would be for developing stand-alone applications in a workstation (local) environment. This is for my career and honestly, 90% of the developers are all experienced in the above three languages and I wanted to improve my chances of staying employed by learning/certifying myself on my own time.

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• Is Python good for highload web projects?

  - by Vitali Fokin

  Hello! I decidet to start my own web project. It should be highload project, and I can't decide which technologies should I use. I'm good in ASP.NET MVC, but I like languages like Python more than C#. I read a lot about Python and Django/Pylons/etc but I didn't find any good examples of highload projects on python. So, the question is: Is Python good for highload project? Is it enough fast? And if it is, are python frameworks like django/pylons/etc good for this? Or asp.net mvc will be better choice? PS, I'm not interesting in Java, Ruby and PHP :) So, I'm choosing only between Python + django/pylons/etc and asp.net mvc. Thanks in advance. Please, don't make holywars :)

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• What is Perl's secret of getting small code do so much?

  - by sak

  I've seen many (code-golf) Perl programs out there and even if I can't read them (Don't know Perl) I wonder how you can manage to get such a small bit of code to do what would take 20 lines in some other programming language. What is the secret of Perl? Is there a special syntax that allows you to do complex tasks in few keystrokes? Is it the mix of regular expressions? I'd like to learn how to write powerful and yet short programs like the ones you know from the code-golf challenges here. What would be the best place to start out? I don't want to learn "clean" Perl - I want to write scripts even I don't understand anymore after a week. If there are other programming languages out there with which I can write even shorter code, please tell me.

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• Another floating point question

  - by jeffmax329

  I have read most of the posts on here regarding floating point, and I understand the basic underlying issue that using IEEE 754 (and just by the nature of storing numbers in binary) certain fractions cannot be represented. I am trying to figure out the following: If both Python and JavaScript use the IEEE 754 standard, why is it that executing the following in Python .1 + .1 Results in 0.20000000000000001 (which is to be expected) Where as in Javascript (in at least Chrome and Firefox) the answer is .2 However performing .1 + .2 In both languages results in 0.30000000000000004 In addition, executing var a = 0.3; in JavaScript and printing a results in 0.3 Where as doing a = 0.3 in Python results in 0.29999999999999999 I would like to understand the reason for this difference in behavior. In addition, many of the posts on OS link to a JavaScript port of Java's BigDecimal, but the link is dead. Does anyone have a copy?

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• I need an efficient protocol between webservices that are more or less supported by all major langua

  - by corgrath

  Hey all. I am looking for a fast and efficient protocol that can be used between different web services to send text-data (not binary data). Doesn't matter if the protocol is binary or text base. Some conditions: I has to be more "efficient" than normal XML which adds a lot of extra data and the tools to read/write is too heavy It has to be "supported" by most major languages, meaning it cannot only be available for one specific language. At the moment, both Java and PHP have to be able to talk to each other using this protocol. I have already looked at: XML - which I am currently using. Hessian 2 -which works perfectly in Java, but the PHP-support is out of date JSON -the different between JSON and XML is only minor Any suggestions are welcome!

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• is it better to use a "natural" language to write code?

  - by M.H

  I recently saw a programming language called supernova and they said in the web page : The Supernova Programming language is a modern scripting language and the First one presents the concept of programming with direct Fiction Description using Clear subset of pure Human Language. and you can write code like: i want window and the window title is Hello World. i want button and button caption is Close. and button name is btn1. btn1 mouse click. instructions are you close window end of instructions my question is not about the language itself but it is that are we need such languages and did they make writing code easier or not?

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• How to localize static content in database with Django

  - by man with python

  My app has tables for languages and countries (actually django-countries at the moment, but open for suggestions). The tables are populated when I initialize the database and remain static after that. What would be the ideal localization mechanism for the contents of these tables, so that I can show the country and language names to users in their chosen site language? I'm aware of projects like django-multilingual and transdb, but IMO they are more suitable for dynamic content, i.e. stuff that's supposed to be modified. Please englighten me!

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• Why does derivative trading position always require C++ knowledge?

  - by Jeffrey

  I’ve never worked in trading environment before and I was curious to see that few of the trading houses seem to use C# but most of them do heavily rely on C++. Why is it? Is it because C++ is better performance wise? Is it because of legacy code base? Is it because cross platform issue? What about dynamic languages (ruby, python)? Are they too slow for this kind of work in terms of performance? Updated: If realibility and performance are important would "Erlang" be the "next big thing" in trading platform?

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• Is it possible to run C++ binded with SDL+OpenGL code on a web browser?

  - by unknownthreat

  My client wants her website to have an application that renders 3D (light 3D stuff, we are drawing only flat squares in 3D world) but web programming is not my thing. So I am looking for something that can run a C++ program from a web browser. But I think, if this is the case, then the client side must download the program first, and that's not what I want. The client should only be able to use this application only on the website. I came across Google Native Client, which claims that it can run x86 native code in web applications. I haven't decide whether it is worth it or not and I don't know whether this is what I want or not, so I decided to ask experienced people about this. If I want to have something like this, is what I said above possible? Or I completely need other languages like Flex because it does not worth the trouble? Or is Google Native Client suitable for doing something like this?

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• [Symfony] Admin generator and i18n

  - by David

  I have read lots of questions about i18n, but I haven't found any about performance. I have a simple backend app listing the contents of an ads table. These ads have a category, that is translated in some languages (it's defined as i18n in the Doctrine schema). So, when I add a "table_method" in my generator.yml to include de Category table, it reduces the number of queries, but there are yet some of them referencing i18n translation tables. So, if I add the category Translation table to the query, it reduces even more the queries BUT it increases the processing time considerably. Why this time penalty? Just because of the translation table? And why isn't the filter using this method to avoid so many translation queries as well? I mean, if I want to filter by category, it is making one query per category to include the translation table. Why??

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• How to use SOAP in asp.net mvc

  - by bastijn

  A 3rd party site sends its notifications after my web application has completed some action in order to notify me of its succes. Receiving a notification item requires a response back to the 3rd party server (URL) with the a containing the value "accepted". I have never user SOAP and with the basic info found I'm a bit lost for the case of asp.net mvc. Are there any good links showing the principle of receiving and sending SOAP responses? Tutorials / information may be presented in other languages such as java, asp.net (classic) or something. I need to get a general idea since googling on SOAP is not giving me anything for the past few hours. thanks in advance.

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• A programming language for teaching data structures and algorithms with? [closed]

  - by Andreas Grech

  Possible Duplicate: Choice of programming language for learning data structures and algorithms Teachers have different opinions on what programming language they would choose to teach data structures and algorithms with. Some would prefer a lower level language such as C because it allows the student to learn more about what goes on beyond the abstractions in terms of memory allocation and deallocation and pointers and pointer arithmetic. On the other hand, others would say that they would prefer a higher level language like Java because it allows the student to learn more about the concepts of the structures and the algorithm design rather than 'waste time' and fiddle around with memory segmentation faults and all the blunders that come with languages where memory management is manual. What is your take on this issue? And also, please post any references you may know of that also discuss this argument.

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• How, in general, can web framework support REST style?

  - by juro

  I would like to know, what are the ways a web framework may be suitable for designing a RESTful app, in general. One goal is for example to provide http request routing, so they are automatically sent to appropriate controllers. From architectural point of view, web framework based on MVC pattern are more suitable for REST. What other features of web frameworks are helpful by building apps satisfying the REST constraints? Is there any reason why you consider certain languages(python/java) or web frameworks(django/turbogears/jersey/restlets/...) as the most applicable ones?

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• Code Golf: Duplicate Character Removal in String

  - by Alex

  The challenge: The shortest code, by character count, that detects and removes duplicate characters in a String. Removal includes ALL instances of the duplicated character (so if you find 3 n's, all three have to go), and original character order needs to be preserved. Example Input 1: nbHHkRvrXbvkn Example Output 1: RrX Example Input 2: nbHHkRbvnrXbvkn Example Output 2: RrX (the second example removes letters that occur three times; some solutions have failed to account for this) (This is based on my other question where I needed the fastest way to do this in C#, but I think it makes good Code Golf across languages.)

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• Why are forward declarations necessary?

  - by user199421

  In languages like C# and Java there is no need to declare (for example) a class before using it. If I understand it correctly this is because the compiler does two passes on the code. In the first it just "collects the information available" and in the second one it checks that the code is correct. In C and C++ the compiler does only one pass so everything needs to be available at that time. So my question basically is why isn't it done this way in C and C++. Wouldn't it eliminate the needs for header files?

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