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  • Returning references while using shared_ptrs

    - by Goose Bumper
    Suppose I have a rather large class Matrix, and I've overloaded operator== to check for equality like so: bool operator==(Matrix &a, Matrix &b); Of course I'm passing the Matrix objects by reference because they are so large. Now i have a method Matrix::inverse() that returns a new Matrix object. Now I want to use the inverse directly in a comparison, like so: if (a.inverse()==b) { ... }` The problem is, this means the inverse method needs to return a reference to a Matrix object. Two questions: Since I'm just using that reference in this once comparison, is this a memory leak? What happens if the object-to-be-returned in the inverse() method belongs to a boost::shared_ptr? As soon as the method exits, the shared_ptr is destroyed and the object is no longer valid. Is there a way to return a reference to an object that belongs to a shared_ptr?

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  • Is there any way to modify a column before it is ordered in MySQL?

    - by George Edison
    I have a table with a field value which is a varchar(255). The contents of the field can be quite varied: $1.20 $2994 $56 + tax (This one can be ignored or truncated to $56 if necessary) I have a query constructed: SELECT value FROM unnamed_table ORDER BY value However, this of course uses ASCII string comparison to order the results and does not use any numerical type of comparison. Is there a way to truly order by value without changing the field type to DECIMAL or something else? In other words, can the value field be modified ('$' removed, value converted to decimal) on the fly before the results are sorted?

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  • Direct comparator in Java out of the box

    - by KARASZI István
    I have a method which needs a Comparator for one of its parameters. I would like to pass a Comparator which does a normal comparison and a reverse comparator which does in reverse. java.util.Collections provides a reverseOrder() this is good for the reverse comparison, but I could not find any normal Comparator. The only solution what came into my mind is Collections.reverseOrder(Collections.reverseOrder()). but I don't like it because the double method calling inside. Of course I could write a NormalComparator like this: public class NormalComparator<T extends Comparable> implements Comparator<T> { public int compare(T o1, T o2) { return o1.compareTo(o2); } } But I'm really surprised that Java doesn't have a solution for this out of the box.

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  • Merging MySQL Structure and Data

    - by Shahid
    I have a MySQL database running on a deployment machine which also contains data. Then I have another MySQL database which has evolved in terms of STRUCTURE + DATA for some time. I need a way to merge the changes (ONLY) for both structure and data to the DB in deployment machine without disturbing the existing data. Does anyone know of a tool available which can do this safely. I have had a look at a few comparison tools but I need a tool which can automate the merge operation. Note also that most of the data in the tables is in BINARY so I can't use many file comparison tools. Does any one know of a solution to this? thanks

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  • Interesting AS3 hash situation. Is it really using strict equality as the documentation says?

    - by Triynko
    AS3 Code: import flash.utils.Dictionary; var num1:Number = Number.NaN; var num2:Number = Math.sqrt(-1); var dic:Dictionary = new Dictionary( true ); trace(num1); //NaN trace(num2); //NaN dic[num1] = "A"; trace( num1 == num2 ); //false trace( num1 === num2 ); //false trace( dic[num1] ); //A trace( dic[num2] ); //A Concerning the key comparison method... "The Dictionary class lets you create a dynamic collection of properties, which uses strict equality (===) for key comparison. When an object is used as a key, the object's identity is used to look up the object, and not the value returned from calling toString() on it." If Dictionary uses strict equality, as the documentation states, then how is it that num1 === num2 is false, and yet dic[num1] resolves to the same hash slot as dic[num2]?

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  • What is the 'noreq' Filter Type an Alias for?

    - by Alan Storm
    I'm looking in to Magento's filtering options (Ecommerce System and PHP Framekwork with an expansive ORM system). Specifically the addFieldToFilter method. In this method, you specify a SQLish filter by passing in a single element array, with the key indicating the type of filter. For example, array('eq'=>'bar') //eq means equal array('neq'=>'bar') //neq means not equal would each give you a where clause that looks like where field = 'bar'; where field != 'bar'; So, deep in the bowels of the source, I found a comparison type named 'moreq' that maps to a = comparison operator array('moreq'=>'27') where field >= 27 The weird thing is, there's already a 'gteq' comparision type array('gteq'=>'27') where field >= 27 So, my question is, what does moreq stand for? Is is some special SQL concept that's supported in other databases that the Magento guys wants to map to MySQL, or is it just "more required" and an example what happens when you're doing rapid agile and trying to maintain backwards compatibility.

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  • How to store and compare time-zone sensitive times

    - by Chad Moran
    I have a data structure where an entity has times stored as an int (minutes into the day) for fast comparison. The entity also has a Foreign Key reference back to a TimeZone table which contains the .NET CLR ID Name and it's Standard Time/Daylight Time acronyms. Since this information is stored as time-zone insensitive - I was wondering how in LINQ to SQL I could convert this into a UTC DateTime for comparison against other times that will be in UTC. Just to be clear this conversion has to be done server-side so that I can execute filtering on the SQL Server and not the client. I am using .NET 3.5 SP1 and SQL Server 2008.

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  • Check for state change in objects using serialization?

    - by sev7n
    I have a form that is bind to an object, and when the user trying to leave the form, I want to warn them if anything on the form has been changed, and prompt them to save. My question is, is there any way to achieve this without implementing IComparar for all my classes in the binded object? I was thinking if there is a way I can serialize my object when loading the form, and do a simple comparison against the change object that also get serialized. Something like a string comparison. Hope that make sense, Thanks

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  • Is a safe accumulator really this complicated?

    - by Martin
    I'm trying to write an accumulator that is well behaved given unconstrained inputs. This seems to not be trivial and requires some pretty strict planning. Is it really this hard? int naive_accumulator(unsigned int max, unsigned int *accumulator, unsigned int amount) { if(*accumulator + amount >= max) return 1; // could overflow *accumulator += max; // could overflow return 0; } int safe_accumulator(unsigned int max, unsigned int *accumulator, unsigned int amount) { // if amount >= max, then certainly *accumulator + amount >= max if(amount >= max) { return 1; } // based on the comparison above, max - amount is defined // but *accumulator + amount might not be if(*accumulator >= max - amount) { return 1; } // based on the comparison above, *accumulator + amount is defined // and *accumulator + amount < max *accumulator += amount; return 0; }

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  • Optimality of Binary Search

    - by templatetypedef
    Hello all- This may be a silly question, but does anyone know of a proof that binary search is asymptotically optimal? That is, if we are given a sorted list of elements where the only permitted operation on those objects is a comparison, how do you prove that the search can't be done in o(lg n)? (That's little-o of lg n, by the way.) Note that I'm restricting this to elements where the only operation permitted operation is a comparison, since there are well-known algorithms that can beat O(lg n) on expectation if you're allowed to do more complex operations on the data (see, for example, interpolation search). Thanks so much! This has really been bugging me since it seems like it should be simple but has managed to resist all my best efforts. :-)

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  • Is the "==" operator required to be defined to use std::find

    - by user144182
    Let's say I have: class myClass std::list<myClass> myList where myClass does not define the == operator and only consists of public fields. In both VS2010 and VS2005 the following does not compile: myClass myClassVal = myList.front(); std::find( myList.begin(), myList.end(), myClassVal ) complaining about lack of == operator. I naively assumed it would do a value comparison of the myClass object's public members, but I am almost positive this is not correct. I assume if I define a == operator or perhaps use a functor instead, it will solve the problem. Alternatively, if my list was holding pointers instead of values, the comparison would work. Is this right or should I be doing something else?

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  • New Cumulative Updates for SQL Server 2005 & SQL Server 2008 R2

    - by AaronBertrand
    Early this morning, the SQL Server Release Services team pushed out three new cumulative updates for SQL Server. KB #2489375 - SQL Server 2005 SP3 CU #14 (9.00.4317) KB #2489409 - SQL Server 2005 SP4 CU #2 (9.00.5259) KB #2489376 - SQL Server 2008 R2 CU #6 (10.50.1765) There are a lot more fixes in the 2008 R2 update - 43, by my count. In comparison, only 9 fixes for 2005 SP4, and only 2 fixes for 2005 SP3. You can draw your own conclusions from that data, particularly if you are still on SQL Server...(read more)

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  • HTC to launch Windows 7 phone in India

    - by samsudeen
    It is a good news for the Indian smart phone users as the wait is finally over for Windows 7 mobile.The Taiwanese  mobile giant HTC is all set to release its Windows 7 based Smartphone series in India from January. HTC HD7 & HTC Mozart , the two smart phones running on Windows 7 OS started appearing on the HTC Indian website (HTC India) from last week.Though Flip kart (Indian online e-commerce website)  has started getting pre -orders for HTC HD7 a month ago , the buzz has started from last week after the introduction of “HTC Mozart”. The complete feature comparison between both the smart phones is given below. Feature Comparison HTC Mozart HTC HD 7 Microsoft Windows 7 Microsoft Windows 7 Qualcomm Snapdragon Processor QSD 8250 1 GHz CPU Qualcomm Snapdragon Processor QSD 8250 1 GHz CPU 8MegaPixel camera with Xenon Flash 5 MP, 2592?1944 pixels, autofocus, dual-LED flash, 480 x 800 pixels, 3.7 inches 480 x 800 pixels, 4.3 inches 11.9mm thick and Weighs 130g 11.2 mm thick and Weighs 162 g Bluetooth 2.1 Bluetooth 2.1 8 GB of internal storage memory 8 GB of internal storage memory 512MB of ROM and 576 of RAM 512MB of ROM and 576 of RAM 3G HSDPA 7.2 Mbps and HSUPA 2 Mbps 3G HSDPA 7.2 Mbps; HSUPA 2 Mbps Wi-Fi 802.11 b/g/n Wi-Fi 802.11 b/g/n Micro-USB interconnector Micro-USB interconnector 3.5mm audio jack 3.5mm audio jack GPS antenna GPS antenna Standard battery Li-Po 1300 MA Standard battery, Li-Ion 1230 MA Standby 360 h (2G) up to 435 h (3G) Up to 310 h (2G) / Up to 320 h (3G) Talk time Up to 6 h 40 min (2G) and 5 h 30 min (3G) Up to 6 h 20 min (2G) / Up to 5 h 20 min (3G) Estimated Price “HTC HD 7″ is priced between  INR 27855 to 32000. though the price of “HDT Mozart” is officially not announced it is estimated to be around INR 30000. Where to Buy The Windows 7 phone is not yet available in stores directly, but most of the leading mobile stores are getting pre -orders. I have given some of the online store links below. Flip kart UniverCell This article titled,HTC to launch Windows 7 phone in India, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • From the Tips Box: Comics on the iPad, Android’s Power Bar, and Limiting Spotlight Search on the iPad

    - by Jason Fitzpatrick
    Once a week we dump out our tips box and share some of the great reader submitted tips with you. This week we’re looking at reading comic strips on the iPad, quick access via the Android Power Bar, and limiting the spotlight search on the iPad. Amazon’s New Kindle Fire Tablet: the How-To Geek Review HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed

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  • Grand Theft Mario [Video]

    - by Asian Angel
    What do you get when you mix Mario and Grand Theft Auto? The “real” answer to where Mario got his racing kart! Here is the original GTA V official trailer that Grand Theft Mario is based on. Grand Theft Mario [via Dorkly Bits] HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way

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  • Best-selling Author on Servlets and JSP, Marty Hall, to Keynote at GIDS 2010

    Hey Guys,Author of More Servlets and JSP, Marty Hall is coming to Bangalore this April to speak on Choosing an Ajax/JavaScript Toolkit: A Comparison of the Most Popular JavaScript Libraries, Pure Java Ajax: An Overview of GWT 2.0, Integrated Ajax Support in JSF 2.0 and Ajax Support in the Prototype JavaScript Library. You can get more information on developersummit dot com...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • An XEvent a Day (8 of 31) – Targets Week – synchronous_event_counter

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week - Bucketizers , looked at the bucketizer Targets in Extended Events and how they can be used to simplify analysis and perform more targeted analysis based on their output.  Today’s post will be fairly short, by comparison to the previous posts, while we look at the synchronous_event_counter target, which can be used to test the impact of an Event Session without actually incurring the cost of Event collection. What is the synchronous_event_counter? The synchronous_event_count...(read more)

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  • Need help with software licensing? Read on&hellip;

    - by juanlarios
    Figuring out which software licensing options best suit your needs while being cost-effective can be confusing. Some businesses end up making their purchases through retail stores which means they miss out on volume licensing opportunities and others may unknowingly be using unlicensed software which means their business may be at risk. So let me help you make the best decision for your situation. You may want to review this blog post that lays out licensing basics for any organization that needs to license software for more than 5 or less than 250 devices or users. It details the different ways you can buy a license and what choices are available for volume licensing, which can give you pricing advantages and provide flexible options for your business. As technology evolves and more organizations move to online services such as Microsoft Office 365, Microsoft Dynamics CRM Online, Windows Azure Platform, Windows Intune and others, it’s important to understand how to purchase, activate and use online service subscriptions to get the most out of your investment. Once purchased through a volume licensing agreement or the Microsoft Online Subscription Program, these services can be managed through web portals: · Online Services Customer Portal (Microsoft Office 365, Microsoft Intune) · Dynamics CRM Online Customer Portal (Microsoft Dynamics CRM Online) · Windows Azure Customer Portal (Windows Azure Platform) · Volume Licensing Service Center (other services) Learn more >> Licensing Resources: The SMB How to Buy Portal – receive clear purchasing and licensing information that is easy to understand in order to help facilitate quick decision making. Microsoft License Advisor (MLA) – Use MLA to research Microsoft Volume Licensing products, programs and pricing. Volume Licensing Service Center (VLSC) – Already have a volume License? Use the VLSC to get you easy access to all your licensing information in one location. Online Services – licensing information for off-premise options. Windows 7 Comparison: – Compare versions of Windows and find out which one is right for you. Office 2010 Comparison: – Find out which Office suite is right for you. Licensing FAQs – Frequently Asked Questions About Product Licensing. Additional Resources You May Find Useful: · TechNet Evaluation Center Try some of our latest Microsoft products For free, Like System Center 2012 Pre-Release Products, and evaluate them before you buy. · Springboard Series Your destination for technical resources, free tools and expert guidance to ease the deployment and management of your Windows-based client infrastructure.   · AlignIT Manager Tech Talk Series A monthly streamed video series with a range of topics for both infrastructure and development managers.  Ask questions and participate real-time or watch the on-demand recording.

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  • Silverlight Cream for March 29, 2010 -- #824

    - by Dave Campbell
    In this Issue: smartyP(-2-), Al Pascual, Mike Taulty, Shawn Burke(-2-), Vikram Pendse, Tomasz Janczuk, Lee, and Alexey Zakharov. Shoutouts: Jeff Weber announced New Silverlight Game “Snow Spill” by Nick Avery of Liserd Arts Games John Papa summarized links to all the Silverlight and Windows Phone 7 Sessions from MIX 10 Tim Heuer has a post up about OData and the MIX10 feed: MIX10: Yet another way to view video content sessions using their OData feed From SilverlightCream.com: Creating a Windows Phone 7 Metro Style Pivot Application [Part 1] smartyP has a two-part video tutorial up on creating a WP7 pivot navigation app using Expression Blend. He's also looking for feedback. Creating a Windows Phone 7 Metro Style Pivot Application [Part 2] In part 2, smartyP adds gestures to his navigation. He also has some good external links listed. Al Pascual: My First Windows Phone 7 Application Al Pascual extends the MIX10 keynote WP7 sample by adding the ability to send tweets ... with all the code. Silverlight 4 RC and the “silent installation” Mike Taulty discusses and demonstrates installing an OOB app without having to visit a webpage to get it. In other words, pass it around on a USB drive, send it in email, etc. iPhone SDK vs Windows Phone 7 Series SDK Challenge, Part 1: Hello World! Shawn Burke has a 2-part series up comparing iPhone and WP7 development looking at how easy it is to code and lines of code produced by the tools. This first post is the classic Hello World. Check out the comments as well. iPhone SDK vs. Windows Phone 7 Series SDK Challenge, Part 2: MoveMe Shawn Burke's part 2 is comparing the classic iPhone 'MoveMe' app... again, check out all the comments. Silverlight 4 : Indic Support in Silverlight Vikram Pendse demonstrates using the Microsoft Indic Language Input tool. He has some screen shots and discussion about fonts in Silverlight. Comparison of HTTP polling duplex and net.tcp performance in Silverlight 4 RC Tomasz Janczuk is checking out Silverlight4 RC and has a comparison up of the performance of the three mechanisms for asynch data push for the server to the client/. Summary rows in Datagrid with multiple groups Lee revisted a post that displayed Summary/Totals in the group header to also support multiple groups now. Silverlight Commands Hacks: Passing EventArgs as CommandParameter to DelegateCommand triggered by EventTrigger Alexey Zakharov suggests a workaround 'InvokeDelegateCommandAction' to keep Blend from ignoring event args. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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