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• C++ STL: Array vs Vector: Raw element accessing performance

  - by oh boy

  I'm building an interpreter and as I'm aiming for raw speed this time, every clock cycle matters for me in this (raw) case. Do you have any experience or information what of the both is faster: Vector or Array? All what matters is the speed I can access an element (opcode receiving), I don't care about inserting, allocation, sorting, etc. I'm going to lean myself out of the window now and say: Arrays are at least a bit faster than vectors in terms of accessing an element i. It seems really logical for me. With vectors you have all those security and controlling overhead which doesn't exist for arrays. (Why) Am I wrong? No, I can't ignore the performance difference - even if it is so small - I have already optimized and minimized every other part of the VM which executes the opcodes :)

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• Am i using too much jquery? When i'm crossing the line?

  - by Andrea

  Lately i find myself using jquery and javascript a lot, often to do the same things that i did before using css. For example, i alternate table rows color or create buttons and links hover effects using javascript/jquery. Is this acceptable? Or should i keep using css for these kind of things? So the real question is: When i'm using too much jquery? How can i understand when i'm crossing the line? Thanks.

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• MySQL LEFT JOIN issue with three WHERE statements

  - by jhat

  I am building a note taking app for myself with tag filtering functions, but am having an issue when trying to grab notes with the tags. The tag filter needs to use AND not IN, because it will help better narrow down what I am looking for. My tables are configured like this: + notes note_id | note_title | note_uid + tags tag_id | tag_title + notes_tags nt_id | nt_note_id | nt_tag_id The notes_tags table keeps track of all notes' tags. I am not worried about returning any information about tags, so here is an example LEFT JOIN I am using currently to only get notes with only 1 tag. SELECT * FROM notes_tags LEFT JOIN notes ON note_id = nt_note_id WHERE note_uid IN ( 1 ) AND nt_tag_id = 10 This query runs perfect, it grabs all of the notes with that single tag. However, I am having issues "pinpointing" my notes using a query like this: SELECT * FROM notes_tags LEFT JOIN notes ON note_id = nt_note_id WHERE note_uid IN ( 1 ) AND nt_tag_id = 10 AND nt_tag_id = 11 What am I doing wrong with the syntax?

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• Preventing click event with jQuery drag and drop

  - by Sasha Yanovets

  I have an elements on page that are draggabe with jQuery. These elements have click event wich navigates to another page (ordinary links for example). What is the best way to prevent click from firing on dropping such element, while allowing clicking it in not drag and drop state? I have this problem with sortable elements, but think it is good to have solution for general drag and drop. I've solved the problem for myself. After that found that same solution exists for Scriptaculous, but maybe someone have a better way to achieve that.

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• What do I put in my Ruby (JRuby) code to break into the debugger?

  - by Daryl Spitzer

  I'm familiarizing myself with some JRuby code, and I'd like to be able to place a breakpoint in the code and run (as usual) from the command-line, having it break into the debugger when it gets to that point. Is there something I can put in my code to force JRuby to break into the debugger? I've tried running jruby -r debug foo.rb (instead of the usual jruby foo.rb), and then setting a breakpoint with b bar.py:98, and then continuing. But the debugger stops every time there's an exception, and there seem to be a lot of them before it gets to the line of code I'm interested in. I'd like to be able to put the "break-into-debugger" line(s) in my code and run jruby foo.rb and have the first place the debugger stops be at that line. (i.e. I'm looking for the Ruby/JRuby equivalent of import pdb;pdb.set_trace() in Python.)

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• Jquery - how to create a sophisticated sidebar that smoothly scrolls down with you

  - by Gal

  I probably couldn't depict it better in the title (and if it has a term let me know), but just to quell the obscurity, I was referring to something like this. After you wait for the page to load, see how when you scroll down, the social media left bar stays fixed, but then when you scroll just enough that it meets your upper side, it sticks to it as you scroll further. I wanted to implement something corny and pretentious like that, so does anybody know a tutorial or a method to get that done in jquery? (I can probably do it myself, if I'm not mistaken, just need some sense of direction from savvy jqueryists). Is there a way to know when and how much a user scrolls? Can it be done with id's like the # url appendix to jump to a specific element? Just some ideas...

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• In what package should a "Settings" class be placed?

  - by Tom

  I'm in the middle of building an application but found myself too easily creating new packages without keeping the project's structure in mind. Now, I'm trying to redo the whole project structure on paper first. I am using a Settings class with public properties, accessed as settings for several other classes around the project. Now, since this Settings class applies for the whole project, I am unsure if it should be packaged and if so, in what kind of package should it exist? Or should it be in the root (the default package) with the main application class? I've been thinking about putting it in my utils package, then again I don't think it really is an utlity. Any strategies on how to decide on such package structure for example for a Settings class?

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• Object initialization sequence in Objective-C

  - by Alex

  Hello everyone. The Cocoa framework has a convention to always call self = [super init] in the init method of an inherited class, because [super init] may return a new instance. What will happen if I do this? @interface MyClass : NSObject /* or any other class */ { int ivar_; } @end @implementation MyClass - (id)init { ivar_ = 12345; if ((self = [super init])) { NSLog(@"ivar_'s value is %d", ivar_); } return self; } @end In the case when [super init] returns a new instance, what will I see in the console? ivar_'s value is 0? I can't think of a way to check this myself, because I don't know which class may return a new instance from its init method. Also, can't seem to find explicit clarification for this scenario in the docs. Could anyone help me out? Thanks!

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• Can ANYONE get _lockroot to work?

  - by webfac

  Hi Guys, I have the following code which ultimately loads a SWF into movieclip 'myloader' using a movie clip loader, code as follows: var myload:MovieClipLoader = new MovieClipLoader(); var listener:Object = new Object(); myload.addListener(listener); listener.onLoadStart = function(){ animcontainer.myloader._lockroot = true; trace("Started"); } listener.onLoadInit = function(){ animcontainer.myloader._lockroot = true; trace("finished and locked"); } listener.onLoadComplete = function(){ animcontainer.myloader._lockroot = true; } myload.loadClip(path, animcontainer.myloader); The swf I am loading has pause, rewind and play buttons that must be referencing _root as they work fine when played alone. Upon loading them into myloader they no longer work. Based on the above code surely the myloader clip should be locking as _root after the load is complete? I have Googled myself dry on this one, no luck. ANY help will be much appreciated, Thanks.

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• Rotating Viewbox contents smoothly

  - by user204562

  I'm looking to teach myself better methods of doing things in WPF that I would normally do manually. In this case, I have a ViewBox with an image in it. I also have a button that uses a DoubleAnimation to rotate the image 90 to the right. This animation works fine, but obviously because it's square as it turns, the image does a "best fit" to the ViewBox which makes the rotation look quite bad, as it gets larger and smaller as its longest edge shrinks or grows to fit to that particular rotation angle. I am looking for any advice on the best way to handle this using appropriate WPF methods. Obviously I could do all the calculations manually, but I would be more interested in finding a way to use the controls and methods built into the .NET architecture. Thanks for your help.

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• Passing a NSString to another ViewController using classes

  - by Jeff Kranenburg

  I know this insanely simple, but I am re-teaching myself the basics and trying to get my head around this:-) I have one ViewController called MainVC and I have one called ClassVC In ClassVC I have this code: @interface ClassVC : UIViewController { NSString *mainLine; } @property (nonatomic, retain) NSString *mainLine; @end and I have this in the implementation file: @synthesize mainLine = _mainLine; -(NSString *)_mainLine { _mainLine = @"This a string from a Class"; return _mainLine; } Now I was thinking that if I #import the ClassVC into MainVC I would be able to transfer that string along as well like so: This code is in the viewDidLoad _mainLabel.text = _secondClass.mainLine; NSLog(@"%@", _secondClass.mainLine); But that is not working - so cannot I not pass strings in through this way???

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• Fastest method for SQL Server inserts, updates, selects

  - by Ian

  I use SPs and this isn't an SP vs code-behind "Build your SQL command" question. I'm looking for a high-throughput method for a backend app that handles many small transactions. I use SQLDataReader for most of the returns since forward only works in most cases for me. I've seen it done many ways, and used most of them myself. Methods that define and accept the stored procedure parameters as parameters themselves and build using cmd.Parameters.Add (with or without specifying the DB value type and/or length) Assembling your SP params and their values into an array or hashtable, then passing to a more abstract method that parses the collection and then runs cmd.Parameters.Add Classes that represent tables, initializing the class upon need, setting the public properties that represent the table fields, and calling methods like Save, Load, etc I'm sure there are others I've seen but can't think of at the moment as well. I'm open to all suggestions.

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• Can JQuery/JavaScript be used to write a substantial client side application?

  - by Ian

  I have an unusual situation - I have an embedded video streaming device with a complicated UI, and I need to use an embedded web server to reproduce that UI through a web browser. I'm thinking of using JavaScript/JQuery on a C++ backend (I am NOT coding all this myself, I need to hire people for the grunt work). The embedded web server is much less powerful than a PC, so I want to write an application that runs the entire UI in the browser, and only communicates with the server to pass new program settings back and forth, get status updates from the device, and control video playback. In other words, the client gets one big page or a small number of big pages (effectively downloading the application), the application maintains significant local memory storage, and once the pages are first loaded the server never sends anything layout-related. The application has two rows of tabs to navigate ~40 menu pages, drag-and-select controls to pick cells in a grid, sorted lists, lots of standard data entry options, and it should be able to control up to 16 embedded video players at once (preferably VLC). Is this possible in JavaScript/JQuery with a C++ backend?

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• How to complete a git clone for a big project on an unstable connection?

  - by LaPingvino

  I am trying to git clone the LibreOffice codebase, but at the moment I have an internet connection by mobile phone of about 300kbps and it's just anything but stable. I can get the connection back any moment, but then the git clone process already stopped working, and no way to get it running again. Is there some way to have a more failure-resistant git clone download? One option I considered myself is to download someone else's .git directory, but that is overly dependent of others and doesn't seem like the best possible solution to me.

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• What's the most performance effective way to have a webbrowser inside a class library ?

  - by Xaqron

  I'm developing a class library. Need some data from internet and this cannot be done with HttpWebRequest in my case so I wanna use WebBrowser component. WebBrowser is used for opening a single page and fetch some data from it, so WebBrowser life-time is very short. Running thread is MTA and no message pump or STA thread is available by default (class library is used by an ASP.NET application). How to create a WebBrowser object, run it with a STA thread, fetch data from a web page and finally dispose it with the least performance impact on the application ? I just need the idea/concept and will find details myself. Thanks guys

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• DLL Load Failed: %1 is not a valid win32 application

  - by glittershark

  So I have a situation where I need to make binary patches and then be able to apply them from within python. I found bsdiff which looks like a great algorithm and has a python extension module, but that extension module doesn't have a windows installer past Python 2.5 Alright, so having never even written C seriously, let alone attempted a python extension module, I set out to compile it myself. After a few hours of bashing my head against a DLL load error with MinGW32, I managed to get it compiled and built using the setup.py provided in the source of the project. However, upon importing the resulting bsdiff module, I get: ImportError: DLL load failed: %1 is not a valid Win32 application. Any advice?

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• ASP.Net Gridview, How to activate Edit Mode based on ID (DataKey)

  - by Jon P

  I have a page, lets call it SourceTypes.aspx, that has a a GridView that is displaying a list of Source Types. Part of the GridView is a DataKey, SourceTypeID. If source TypeID is passed to the page via a query sting, how to I put the Gridview into Edit mode for the appropriate row based on the SourceTypeID? The GridView is bound to a SQlDataSource object. I have a feeling I am going to kick myself when the answer appears!! I have looked at Putting a gridview row in edit mode programmatically but it is some what lacking in specifics

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• extracting multiple fields from a text file using php

  - by Dave

  Hi, what is the best way of extracting multiple (~40 values) from a text file using php? the data is more or less like: NAMEA valuea NAMEB valueb I'm looking for a proper* approach to extracting this data into a data-structure, because i will need to specify regexs for all of them (all 40). did i make myself clear? *meaning, the default/painful method would be for me to do: $namea = extractfunction("regexa", $textfilevalue); $nameb = extractfunction("regeb", $textfilevalue); ... 40 times!

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• Does this interface already exist in the standard .NET libraries?

  - by VoidStar

  I found myself needing a simple generic interface, and I wrote it, but it turned out to be pretty much the world's simplest interface. I was wondering if it already exists by some other name. I just want to make sure I'm not reinventing something that is already included with the .NET framework. interface IReceiver<T> { void Receive(T obj); } I can't really find a good list of "standard" interfaces that came with .NET. Does the structure of this interface look familiar to anyone? Have I reinvented something that is already standard? EDIT: I have a data object and a number of objects interested in receiving the data. Objects interested in receiving the data implement the interface, so that 'routing' lists and maps can send the data to them. The idea is full generalization in the routing, the routing will be data-driven.

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• What is the correct way to fix this Javascript closure

  - by sujoe

  I have been familiarizing myself with javascript closures and ran across this article http://blog.morrisjohns.com/javascript_closures_for_dummies.html Due to the closure, Example 5 does not work as expected. How would one modify result.push( function() {alert(item + ' ' + list[i])} ); to make the code work? function buildList(list) { var result = []; for (var i = 0; i < list.length; i++) { var item = 'item' + list[i]; result.push( function() {alert(item + ' ' + list[i])} ); } return result; } function testList() { var fnlist = buildList([1,2,3]); // using j only to help prevent confusion - could use i for (var j = 0; j < fnlist.length; j++) { fnlist[j](); } } testList(); Thanks!

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• How can I edit a js file sent by the server before it gets to my browser?

  - by pstone

  During a normal browsing session I want to edit a specific javascript file before the browser receives since once it gets there it's impossible to edit. Is there are any tool for this? For what I need it I can't just save it and edit it on my disk. I'm ready to learn how to program it myself but if anyone can point out more or less what I have to do I'd be very grateful. I'd have to intercept the packets until I have the whole file while blocking the browser from receiving it any part of it, then edit it manually and forward it to the same port. I don't think I can do this by just using pcap, I've read a bit about scapy but I'm not sure if it can help me either. Thanks in advance.

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• While programming, what to do when facing with a seemingly unsolvable situation with a time limit?

  - by Ersan Tasan

  This is not a technical question, but rather a social and methodical one. I am a computer sciences student and I usually have really tough programming assignments. I don`t know if it is only happening to me but sometimes, particularly when deadline is approaching, i find myself in a harsh situation. I cannot find my mistake in the code or come up with a another great idea. Then boredom comes in and the problem begins to seem unsolvable. I know there are more-than-great professional coders here. I would like to learn their ideas to cope with this situation. Is it better to focus on something else for a while and try again or try harder and harder and look for the solution on the net etc...

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• MySQL is there a Single Select to Query Various Unrelated Values from a database?

  - by zzapper

  I saw somewhere what seemed to be nested selects, one "master" select on the "outside" and a series of selects inside- is this possible? I'm not talking about joins as there is particular relation between the selects. I seem not to be explaining myself very well. I want to do a single query which will pull out a series of stats from various tables latest order, latest customer, largest order. Obviously I can do that with a series of selects. The example I saw was something like select ( select ... from tbl_1 where .., select ... from tbl_2 where .., select ... from tbl_3 where .., ... )

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• HTML to automatically hide text depending on scrolled size (like in Gmail)?

  - by Stephen Cagle

  Look at your Gmail inbox. You have 3 main columns contains the Sender contains "THE_EMAIL_SUBJECT - THE_EMAIL_BODY" the date the email was sent on I note that when you resize the window, the Gmail web client automatically resizes the displayed text in the second column. It basically just truncates the text so that it always can display the sent on date to the right, and the sender to the left. It is a pretty neat effect, and I would like to have that effect for myself. Does anyone know how to do this in HTML/CSS/JS?

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• Anyway to surround code block with curly braces {} in VS2008?

  - by Jim McKeeth

  I always find myself needing to enclose a block of code in curly braces { }, but unfortunately that isn't included in the C# surround code snippets, which seems to be an oversight. I couldn't find anything on building your own surround snippets either (just other kinds of snippets). I am actually running Resharper too, but it doesn't seem to have this functionality either (or I haven't figured how to activate it). We have a coding standard of including even a single line of code after an if or else in curly braces, so if I could just make Resharper do that refactor automatically that would be even better!

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