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• How are $LOAD_PATH and $: different?

  - by Benjamin Oakes

  I needed to know what was in my Ruby load path, so I did this: $ ruby -e "puts $LOAD_PATH" It didn't print anything out, which I didn't expect. So I tried this: $ ruby -e "puts $:" /usr/local/lib/site_ruby/1.8 /usr/local/lib/site_ruby/1.8/i486-linux /usr/local/lib/site_ruby/1.8/i386-linux /usr/local/lib/site_ruby /usr/lib/ruby/vendor_ruby/1.8 /usr/lib/ruby/vendor_ruby/1.8/i486-linux /usr/lib/ruby/vendor_ruby /usr/lib/ruby/1.8 /usr/lib/ruby/1.8/i486-linux /usr/lib/ruby/1.8/i386-linux . Why does the second one give me the expected output and the first one doesn't? Shouldn't they be the same? I just tried it in irb, and I got the results I expected. This is my Ruby version, in case it makes a difference: $ ruby --version ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]

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• Problem when using \LaTeX \includegraphics with some PDF files

  - by brandstaetter

  I noticed some strange effects when including existing pdf graphics in my laTeX documents: Most file work flawlessly, but some PDFs that were created on a different machine (or from the web) cause the whole page on which they are embedded to become ever-so-slightly distorted. I only notice the difference in a side-by-side comparison, but once you see it, it's obvious. The text layout seems slightly broken, and when you zoom in you can see it better. I will try to make some screenshots to further elaborate, but in the meantime: Has anyone seen this before and how can I get rid of these distortions?

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• jQuery - deferred versus promise

  - by fletchsod

  What is the difference between Deferred and Promise other than the jQuery versions? What should I use for my need? I only want to call the fooExecute(). I only need the fooStart() and fooEnd() to toggle the html div status for example. //I'm using jQuery v2.0.0 function fooStart() { /* Start Notification */ } function fooEnd() { /* End Notification */ } function fooExecute() { /* Execute the scripts */ } $('#button1').on('click', function() { var deferred1 = $.Deferred(); var promise1 = $.Promise(); deferred1.??? promise1.??? });

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• How can creating the SessionFactory become slow after updating Hibernate?

  - by DR

  In my Java SE application I used Hibernate 3.4 and creating the SessionFactory took about 5 seconds. Today I updated to Hibernate 3.5.1 and suddenly it takes over a minute. What can be the cause of such a dramatic effect? I tried different things the better part of the day and I have no clue... Some data I collected According to the profiler the most time is spent in PersisterFactory.createClassPersister and in that method ProxyFactory.createClass takes the most time. The log shows nothing unusual Changing hibernate.bytecode.use_reflection_optimizer makes no difference

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• accessing my public methods from within my namespace

  - by Derek Adair

  I am in the process of making my own namespace in JavaScript... (function(window){ (function(){ var myNamespace = { somePublicMethod: function(){ }, anotherPublicMethod: function(){ } } return (window.myNamespace = window.my = myNamespace) }()); })(window); I'm new to these kinds of advanced JavaScript techniques and i'm trying to figure out the best way to call public methods from within my namespace. It appears that within my public methods this is being set to myNamespace. Should I call public methods like... AnotherPublicMethod: function(){ this.somePublicMethod() } or... AnotherPublicMethod: function(){ my.somePublicMethod(); } is there any difference?

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• O(N log N) Complexity - Similar to linear?

  - by gav

  Hey All, So I think I'm going to get buried for asking such a trivial but I'm a little confused about something. I have implemented quicksort in Java and C and I was doing some basic comparissons. The graph came out as two straight lines, with the C being 4ms faster than the Java counterpart over 100,000 random integers. The code for my tests can be found here; android-benchmarks I wasn't sure what an (n log n) line would look like but I didn't think it would be straight. I just wanted to check that this is the expected result and that I shouldn't try to find an error in my code. I stuck the formula into excel and for base 10 it seems to be a straight line with a kink at the start. Is this because the difference between log(n) and log(n+1) increases linearly? Thanks, Gav

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• How do I get MSBuild Task to generate XML Documents when building a solution?

  - by toba303

  I have a solution with lots of projects. Each project is configured to generate the XML documentation file when building in Debug-Mode (which is default). That works when I build in Visual Studio 2008. In my build script on my integration server I advise MSBuild to build the whole solution, but it won't generate the documentation files. What can I do? I already tried to explicitly give the Debug-Condition to the build process, but it makes no difference. <Target Name="BuilSolution"> <MSBuild Projects="C:\Path\To\MySolution.sln" targets="Build" Properties="SolutionConfigurationPlatforms='Debug|Any CPU'"/> </Target> There seem to be some ideas to solve this problem when building single projects, but I can't afford to do this, so I need a hint for doing it this way. Thanks in advance!

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• Best choice for off-site backup: dd vs tar

  - by plok

  I have two 1TB single-partition hard disks configured as RAID1, of which I would like to make an off-site backup on a third disk, which I am still to buy. The idea is to store the backup at a relative's house, considerably far away from my place, in the hope that all the information will be safe in the case of a global thermonuclear apocalypse. Of course, this backup would be well encrypted. What I still have to decide is whether I am going to simply tar the entire partition or, instead, use dd to create an image of the disks. Is there any non-trivial difference between these two approaches that I could be overlooking? This off-site backup would be updated no more than two or three times a year, in the best of the cases, so performance should not be a factor to be pondered at all. What, and why, would you use if you were me? dd, tar, or a third option?

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• Making a PHP object behave like an array?

  - by Mark Biek

  I'd like to be able to write a PHP class that behaves like an array and uses normal array syntax for getting & setting. For example (where Foo is a PHP class of my making): $foo = new Foo(); $foo['fooKey'] = 'foo value'; echo $foo['fooKey']; I know that PHP has the _get and _set magic methods but those don't let you use array notation to access items. Python handles it by overloading __getitem__ and __setitem__. Is there a way to do this in PHP? If it makes a difference, I'm running PHP 5.2.

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• C - memset segfault for statically allocated char array

  - by user1327031

  I get a segfault when trying to memset an array of chars that was allocated statically, but not for an array of the same length that was allocated using malloc. variable definitions: //static char inBuff[IN_BUFF_LEN]; //dynamic char * inBuffD; function call: //static, cast used because char** != char (*) [n] serverInit(portNum, (char**) &inBuff, &serv_addr, &sockfd) //dynamic serverInit(portNum, &inBuffD, &serv_addr, &sockfd) use within the function: memset(*inBuffAdr, 0, IN_BUFF_LEN); I suspect that my problem is in the difference of the function calls, or to be more precise, my incomplete understanding of the "char** != char (*) [n]" situation. But I have been banging at this for too long and can't see the forest from the trees so any hints and advice would be very appreciated.

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• Performance implications of using a variable versus a magic number

  - by Nathan

  I'm often confused by this. I've always been taught to name numbers I use often using variables or constants, but if it reduces the efficiency of the program, should I still do it? Heres an example: private int CenterText(Font font, PrintPageEventArgs e, string text) { int recieptCenter = 125; int stringLength = Convert.ToInt32(e.Graphics.MeasureString(text, font)); return recieptCenter - stringLength / 2; } The above code is using named variables, but runs slower then this code: private int CenterText(Font font, PrintPageEventArgs e, string text) { return 125 - Convert.ToInt32(e.Graphics.MeasureString(text, font) / 2); } In this example, the difference in execution time is minimal, but what about in larger blocks of code?

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• Struts2 plugins - Dojo or jQuery or...?

  - by Trick

  Since Apache Struts has deprecated Dojo plugin from Struts 2.1.x I am thinking to change everything to jQuery. I especially noticed the difference in sizes (170kb vs 19kb - something like that). I had troubles with IE browser with handling dojo scripts, is this happening also with jQuery (when user is working with the application for a long time, script stops running)? I have a lot of dojo tags in my applications, and I use most of theirs attributes. Has anyone had any experience doing that? What were the problems? What were the benefits? Downsides? Does anyone has any better ideas of which plugin to include with Struts2? Any answer will be great! Thanks.

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• How to call object's method from constructor?

  - by Kirzilla

  Hello, var Dog = function(name) { this.name = name; this.sayName(); } Dog.prototype.sayName = function() { alert(this.name); } I'm creating new instance of Dog object, but method sayName() is undefined. Why? Or maybe I should do something like (but I can't see difference)... var Dog = function(name) { this.name = name; this.prototype.sayName = function() { alert(this.name); } } Thank you.

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• [dynamic] Different behaviours between .NET 4.0 beta 2 and last release of .NET 4.0 !

  - by yogi4ever

  Hi. I've identified a difference of DLR between .NET 4.0 Beta 2 and the last release of .NET 4.0. In .NET 4.0 Beta 2, this code perfectly works at runtime : var dateTimeList = new List(); dynamic myDynamicObject = dateTimeList; object value = DateTime.Now; myDynamicObject.Add(value); Now, with last release of .NET 4.0, I have an exception at run time (to solve myDynamicObject.Add(value);) :-( In my real code, 'myDynamicObject' is a dynamic (but I know that it is always an ObservableCollection where T can be anything). 'value' is an instance which was got by some reflexions. As 'value' can have any type, the type of 'value' is Object. Do you see how can I solve this new limitation of .NET 4.0 ? Thanks

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• How to debug a running C++ program in Linux?

  - by skydoor

  Hi I have a question about debugging a running C++ program in Linux. If a programming is already running and can't be interrupted, how to do that. I can find three ways, but I don't know too much about details, I am grateful if any one can elaborate it deeper. 1) we can use GDB by specifying the process ID gdb -p PID In this case, what's the difference between this and attach PID? 2) We can use pstat, however, I am using Ubuntu, no pstat, but only mpstat it seems that mpstat does not provide too much information, and not so many options. 3) check the details information under directory ./proc In this case, just go to the directory with the PID. However, should this be done mannually?

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• Reference Parameters in C++: VERY basic example please.

  - by Sagistic

  I am trying to understand how to use reference parameters. There are several examples in my text, however they are too complicated for me to understand why and how to use them. Could anyone give me the MOST basic example of how/why to use one, and perhaps the difference with or without it (what would happen if you didn't attach the '&'). for example, if I've created a function: int doSomething(int& a, int& b), what would be the consequences of not putting in that '&.' I understand that reference variables are used in order to change a formal-reference, which then allows a two-way exchange of parameters. However, that is the extent of my knowledge, and a more concrete example would be of much help. Thank you.

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• Imitating Multiple Inheritance in PHP

  - by fabieno

  I am working on my own MVC framework and found myself stuck. I need the following construction: Controller -- Backend_Controller -- Backend_Crud_Controller -- Frontend_Controller -- Frontend_Crud_Controller Both 'Backend_Crud_Controller' and 'Frontend_Crud_Controller' have the same functionality and thus they should extend another class named 'Base_Crud_Controller', the only difference comes from the 'Backend/Frontend' Controllers which implement different mechanisms. Basically they should inherit both classes but my problem is that 'Backend/Frontend' controller doesn't necessarily extend 'Base_Crud_Controller'. I know multiple inheritance doesn't exist in PHP but I am looking for a solution, I choose to refrain Mixins (like in Symfony) as I don't consider that an elegant solution. Interfaces do not suit me as all of these end up as concrete classes that should implement methods.

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• Spring 3.0 REST implementation or Jersey?

  - by hnilsen

  Hi, SO! I'm currently trying to figure out which implementation of JSR-311 I'm going to recommend further up the food chain. I've pretty much narrowed it down to two options - Spring 3.0 with it's native support for REST - or use Sun's own Jersey (Restlets might also be an option). To me it doesn't seem to be much of a difference in the actual syntax, but there might be issues with performance that I haven't figured out yet. The service is meant to replace some heavy-duty EJB's and make a RESTful Webservice instead. The load is expected to be rather high, up in the 100k users per day (max) range, but will be seriously load balanced. Thanks for all your insights.

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• Why timed lock doesnt throws a timeout exception in C++0x?

  - by Vicente Botet Escriba

  C++0x allows to lock on a mutex until a given time is reached, and return a boolean stating if the mutex has been locked or not. template <class Clock, class Duration> bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); In some contexts, I consider an exceptional situation that the locking fails because of timeout. In this case an exception should be more appropriated. To make the difference a function lock_until could be used to get a timeout exception when the time is reached before locking. template <class Clock, class Duration> void lock_until(const chrono::time_point<Clock, Duration>& abs_time); Do you think that lock_until should be more adequate in some contexts? if yes, on which ones? If no, why try_lock_until will always be a better choice?

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• What is the term(s) used to describe programming language syntax?

  - by Mr Roys

  Is there an exact/correct term to describe this difference between the syntax/constructs of programming langauges e.g VB6 with its (if ... else ... endif) and C# with its curly braces for conditional statements. I'm using VB6 syntax and C# as examples since I'm more familiar with their syntax. For example, Visual Basic 6's syntax uses a more verbose, natural language like structure. If (id = 0) Then id = MyObject.Add(Me) Else Call MyObject.Update(Me) End If while C# has more concise syntax like: if (id == 0) { id = MyObject.Add(this); } else { MyObject.Update(this); } Conciseness? Natural languageness? Or is there a more "scientific" word for describing syntax?

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• I just can't figure out strcat.

  - by Anonymous

  I know I shouldn't be using that function, and I don't care. Last time I checked the spec for strcat, it said something along the lines of updating the first value as well as returning the same. Now, this is a really stupid question, and I want you to explain it like you're talking to a really stupid person. Why won't this work? char* foo="foo"; printf(strcat(foo,"bar")); EDIT: I don't know the difference between char[] and char*. How would I allocate a string of 255 characters? EDIT 2: OK, OK, so char[number] allocates a string of that many bytes? Makes sense. Thanks.

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• What is the differnce between an Oracle and Microsoft schema?

  - by Tarzan

  I am working on an enterprise project. Some of the team has an Oracle background and some has a Microsoft SQL Server background. There is much confusion when we talk about schemas. I am trying to provide some clarity. Is this an accurate way to describe the difference in the meaning of schemas between the two technologies? An Oracle schema is associated with a single user and consists of the objects owned by the user. A MS SQL Server schema schema is a namespace.

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• Asterisk + FreePBX + GoTalk. Inbound route not working.

  - by user289581

  I'm running asterisk 1.6.2.6 and freepbx-2.7.0 My trunk is configured as follows: Outgoing Settings Trunk name: GoTalk Peer Details: host=sip.gotalk.com username=09xxxxxx secret=YNxxxxxx type=peer fromuser=09xxxxxx fromdomain=sip.gotalk.com canreinvite=no insecure=very Incoming Settings User Context: 09xxxxx User Details: username=09xxxxx fromuser=09xxxxx type=peer secret=YNxxxxx insecure=very host=dynamic fromdomain=sip.gotalk.com context=from-pstn Register String: 09xxxxxx:[email protected]/09xxxxxx I have an inbound route called Incoming with DID 09xxxxxx diverted to local extension 200 When I do a sip trace and dial my telephone number 0741xxxxx I just get failure beeps. I never see any SIP traffic from GoTalk to my asterisk server trying to connect the call. Seems I'm not registering correctly for incoming calls because GoTalk aren't sending them to me. I am correct in using the GoTalk username 09xxxxxx as the DID, aren't I ? I've tried using my phone number but it makes no difference.

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• How can I remove a browser's cache server-side, using ASP.NET?

  - by Noman

  How can I remove a browser's cache server-side, using ASP.NET (C#)? A coupon shows by itself (I believe it comes from cache as I did also browse for other apparel sites). It breaks my JavaScript as well as my server-side code, as I am using an UpdatePanel for Ajax, and it duplicates the UpdatePanel's ID. I have renamed the UpdatePanel's ID, but it makes no difference. It generates "Invalid view State" exception. The coupon name is "FastSave" What I have tried: Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1)); Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.Cache.SetNoStore();

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• Copy method optimization in compilers

  - by Dženan

  Hi All! I have the following code: void Stack::operator =(Stack &rhs) { //do the actual copying } Stack::Stack(Stack &rhs) //copy-constructor { top=NULL; //initialize this as an empty stack (which it is) *this=rhs; //invoke assignment operator } Stack& Stack::CopyStack() { return *this; //this statement will invoke copy contructor } It is being used like this: unsigned Stack::count() { unsigned c=0; Stack copy=CopyStack(); while (!copy.empty()) { copy.pop(); c++; } return c; } Removing reference symbol from declaration of CopyStack (returning a copy instead of reference) makes no difference in visual studio 2008 (with respect to number of times copying is invoked). I guess it gets optimized away - normally it should first make a copy for the return value, then call assignment operator once more to assign it to variable sc. What is your experience with this sort of optimization in different compilers? Regards, Dženan

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