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  • How do I dynamically reference incremented properties in C#?

    - by Jeff Blankenburg
    I have properties called reel1, reel2, reel3, and reel4. How can I dynamically reference these properties by just passing an integer (1-4) to my method? Specifically, I am looking for how to get an object reference without knowing the name of the object. In Javascript, I would do: temp = eval("reel" + tempInt); and temp would be equal to reel1, the object. Can't seem to figure this simple concept out in C#.

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  • Why is a c++ reference considered safer than a pointer?

    - by anand.arumug
    When the c++ compiler generates very similar assembler code for a reference and pointer, why is using references preferred (and considered safer) compared to pointers? I did see Difference between pointer variable and reference variable in C++ which discusses the differences between them. EDIT-1: I was looking at the assembler code generated by g++ for this small program: int main(int argc, char* argv[]) { int a; int &ra = a; int *pa = &a; }

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  • jquery - How to reference two div elements for a single function?

    - by Ben
    I Have a function that references a specific input text box. I would like to extend the function to be used by two specific input text boxes. Rather than duplicate the code for the other text box, can anyone advise on how to reference the other? Here it uses #Tags, but if i wanted it to reference #Tags2 also, how could I do that? $(function () { $('#Tags').tagSuggest({ separator: ", ", tagContainer: 'div', tags: ["tag1","tag2"] }); });

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  • Would the instance reference parameters passed into the static methods get garbage collected?

    - by 123Developer
    I know that the static objects in .Net managed world are loaded in Loader Heap which is never going to be garbage collected. What happens to the instance reference parameters passed to a static methods. Are they get garbage collected once the static function executed completely Or they are going to live forever as those instance reference variables are once passed to static method? I am really confused this evening; Please guide me. Thanks and regards 123Developer.

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  • Is there a pattern or best practice for passing a reference type to multiple classes vs a static class?

    - by Dave
    My .NET application creates HTML files, and as such, the structure looks like variable myData BuildHomePage() variable graph = new BuildGraphPage(myData) variable table = BuildTablePage(myData) BuildGraphPage and BuildTablePage both require access data, the myData object. In the above example, I've passed the myData object to 2 constructors. This is what I'm doing now, in my current project. The myData object, and it's properties are all readonly. The problem is, the number of pages which will require this object has grown. In the real project, there are currently 4, but the new spec is to have about 20. Passing this object to the constructor of each new object and assigning it to a field is a little time consuming, but not a hardship! This poses the question whether it's better practice to continue as I have, or to refactor and create a new static class for myData which can be referenced from any where in my project. I guess my abilities to use Google are poor, because I did try and find an appropriate pattern as I am sure this type of design must be common place but my results returned nothing. Is there a pattern which is suited, or do best practices lean towards one implementation over another.

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  • Build Dependencies and Silverlight 4

    - by Kyle Burns
    At my current position, I’ve been doing quite a bit of Silverlight development and have also been working with TFS2010 build services to enable continuous integration.  One of the critical pieces of a successful continuous build setup (and also one of the benefits of having one) is that the build system should be able to “get latest” against the source repository and immediately build with no errors.  This can break down both in an automated build scenario and a “new guy” scenario when the solution has external dependencies that may not be present in the build environment. The method that I use to address the dependency issue is to store all of the binaries upon which my solution depends in a folder under the solution root called “Reference Items”.  I keep this folder as part of the solution and check all of the binaries into source control so when I get the latest version of the solution from source control all of the binaries are downloaded to my machine as well and gets me closer to the ideal where a new developer installs the development IDE, get latest and can immediately build and run unit tests before jumping into coding the feature of the day. This all sounds pretty good (and it is), but a little while back I ran into one of those little hiccups that requires a little manual intervention.  The issue that I ran into is that with Silverlight (at least version 4), the behavior of the “Add Reference” command when adding reference to a DLL that is present in the GAC is to omit the HintPath element that it includes with regular .Net projects, so even if the DLL is setting in the Reference Items folder and downloaded to the build machine it cannot be found at compile time and the build will fail. To work around this behavior, you need to be comfortable editing the XML project files generated by Visual Studio (in my case this is typically a .csproj file).  Simply open the project file in your favorite text editor, find the Reference element that refers to the component, and modify the XML to include the HintPath.  Here’s a before and after example of the component that ultimately led me to the investigation behind this post: Before: <Reference Include="Telerik.Windows.Controls, Version=2011.2.920.1040, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL" /> After: <Reference Include="Telerik.Windows.Controls, Version=2011.2.920.1040, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL">       <HintPath>..\Reference Items\Telerik.Windows.Controls.dll</HintPath>     </Reference>

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  • What is Mark Shuttleworth's "Easter eggs" blog a reference to? [closed]

    - by fluteflute
    I saw this blog post today, and I was wondering if there's some meaning within the Ubuntu community that I've missed? (I know what an easter egg is in a computer context.) One of our ducks has started dropping eggs in random locations in the garden. I don’t know which duck, but I assume it’s one of the new females we took in from the SPCA, who hasn’t figured out “nesting” yet. I do love ‘em but they’re not African Grey’s in the IQ department. Anyhow, I think I finally understand why people hide eggs in the garden at Easter. Because ducks used to do it for them! I suppose, for millennia, this has been the season to go hunting for eggs. Now we just substitute chocolate ones instead. For the moment, I’ve kept them in a cool shady spot while I keep an eye out for an actual nest. If a polecat doesn’t find them first, I may be able to slip them onto the nest in time for them to get hatched along with some cousins.

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  • Canonical et Nokia pourraient travailler en collaboration sur Qt, il pourrait devenir le framework de référence pour Ubuntu

    Canonical et Nokia pourraient travailler en collaboration sur Qt Sur les quelques derniers mois, des contacts ont eu lieu entre les développeurs de Qt et Canonical ainsi qu'avec les participants au projet Ubuntu. Mark Zimmerman, CTO de Canonical, disait sur son blog, en octobre : Citation: Envoyé par Mark Zimmerman, CTO de Canonical I have been thinking about Qt recently. We want to make it fast, easy and painless to devel...

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  • Meta package / quick reference for command line string manipulation tools?

    - by Dylan McCall
    The latest version of the Scribes text editor lets us select some text, hit Alt+X, and then run an arbitrary command. For example, I can run the sort command and the selected text is replaced appropriately. This is quite useful but I am also not very well-versed in awk and the like. Is there something I can grab that will provide more of these commands like sort? Maybe a package with a whole bunch of handy, task-specific string manipulation commands?

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  • How do I temporarily reference a new web host using my existing domain name?

    - by Alex Angas
    On provider A I have an existing web hosting account running my site. On provider B I have my domain name registered pointing to the web hosting on provider A. I've just purchased a web hosting account with provider B and want to move my site there. Is there a way to temporarily use my domain name to point to provider B while I set up the site (e.g. just from my computer)? I tried to change the HOSTS file (Windows) and while pings resolved to what I set, HTTP requests don't.

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  • In a 2D tile-based game, how should NPCs and tiles reference each other?

    - by lezebulon
    I'm making a tile engine for 2D games (seen from the top). Basically the world is composed of a grid of tiles. Now I want to put for instance NPCs that can move on the map. What do you think is best: 1) each tile has a pointer to the NPC that is on its tile, or a NULL pointer 2) having a list of NPCs, and they have the coordinates of the tile they are on. 3) something else? 1) is faster for collision detection but it would use much more memory space and it is slower to find all NPCs in a map. 2) is the opposite. thanks

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  • Storing a pass-by-reference parameter as a pointer - Bad practice?

    - by Karl Nicoll
    I recently came across the following pattern in an API I've been forced to use: class SomeObject { public: // Constructor. SomeObject(bool copy = false); // Set a value. void SetValue(const ComplexType &value); private: bool m_copy; ComplexType *m_pComplexType; ComplexType m_complexType; }; // ------------------------------------------------------------ SomeObject::SomeObject(bool copy) : m_copy(copy) { } // ------------------------------------------------------------ void SomeObject::SetValue(const ComplexType &value) { if (m_copy) m_complexType.assign(value); else m_pComplexType = const_cast<ComplexType *>(&value); } The background behind this pattern is that it is used to hold data prior to it being encoded and sent to a TCP socket. The copy weirdness is designed to make the class SomeObject efficient by only holding a pointer to the object until it needs to be encoded, but also provide the option to copy values if the lifetime of the SomeObject exceeds the lifetime of a ComplexType. However, consider the following: SomeObject SomeFunction() { ComplexType complexTypeInstance(1); // Create an instance of ComplexType. SomeObject encodeHelper; encodeHelper.SetValue(complexTypeInstance); // Okay. return encodeHelper; // Uh oh! complexTypeInstance has been destroyed, and // now encoding will venture into the realm of undefined // behaviour! } I tripped over this because I used the default constructor, and this resulted in messages being encoded as blank (through a fluke of undefined behaviour). It took an absolute age to pinpoint the cause! Anyway, is this a standard pattern for something like this? Are there any advantages to doing it this way vs overloading the SetValue method to accept a pointer that I'm missing? Thanks!

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  • Is there a definitive reference on Pinball playfield design?

    - by World Engineer
    I'm looking at designing tables for Future Pinball but I'm not sure where to start as I've little background in game design per se. I've played scores of pinball tables over the years so I've a fairly good idea of what is "fun" in those terms. However, I'd like to know if there is a definitive "bible" of pinball design as far as layout and scoring/mode design goes. I've looked but there doesn't seem to be anything really coherent that I could find. Is it simply a lost art or am I missing some buried gem?

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  • What reference point/ tutorial could I use to help me make a "Ball rolling" game in flash?

    - by user1798964
    I am a complete newbie to programming, only took high school Computer science so I kind of know what im doing, I just want to know how I can make a ball rolling game that I want to make, could anyone show me an example of a good "ball rolling game" that has good physics and everything, I have tried to use Box2D for the physics portion of the game, but I found that using that is just code and I can't figure out how to make the graphics and details of the world I want to make in my game, all I would like to do would have a game that has the collision detection and physics of box2d only apply to one ball in it and use the left and right keys to move it. sorry if I am too unclear, if anyone could show a tutorial or something to me on how to make a proper "Ball rolling" game that has good physics that would be appreciated, thank you for taking the time to read this

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  • I am getting error when using Attributes in Rcpp and have RcppArmadillo code

    - by howard123
    I am trying to create a package with RcppArmadillo. The code uses the new attributes methodology of Rcpp. The sourceCpp works fine and compiles the code, but when I build a package I get errors when I use RcppArmadillo code. Without the RcppArmadillo code and using regulare C++, I do not get these errors. The C++ code (it is essentially the fastLm sample code) is: // [[Rcpp::depends(RcppArmadillo)]] #include <Rcpp.h> #include <RcppArmadillo.h> using namespace Rcpp; // [[Rcpp::depends(RcppArmadillo)]] #include <RcppArmadillo.h> // [[Rcpp::export]] List fastLm(NumericVector yr, NumericMatrix Xr) { int n = Xr.nrow(), k = Xr.ncol(); arma::mat X(Xr.begin(), n, k, false); arma::colvec y(yr.begin(), yr.size(), false); arma::colvec coef = arma::solve(X, y); arma::colvec resid = y - X*coef; double sig2 = arma::as_scalar(arma::trans(resid)*resid/(n-k)); arma::colvec stderrest = arma::sqrt( sig2 * arma::diagvec( arma::inv(arma::trans(X)*X)) ); return List::create(Named("coefficients") = coef, Named("stderr") = stderrest); } Here is the compilation error, after I execute "R Rcpp::compileAttributes() * Updated src/RcppExports.cpp == Rcmd.exe INSTALL --no-multiarch NewPackage * installing to library 'C:/Users/Howard/Documents/R/win-library/2.15' * installing *source* package 'NewPackage' ... ** libs g++ -m64 -I"C:/R/R-2-15-2/include" -DNDEBUG -I"C:/Users/Howard/Documents/R/win-library/2.15/Rcpp/include" -I"C:/Users/Howard/Documents/R/win-library/2.15/RcppArmadillo/include" -I"d:/RCompile/CRANpkg/extralibs64/local/include" -O2 -Wall -mtune=core2 -c RcppExports.cpp -o RcppExports.o g++ -m64 -I"C:/R/R-2-15-2/include" -DNDEBUG -I"C:/Users/Howard/Documents/R/win-library/2.15/Rcpp/include" -I"C:/Users/Howard/Documents/R/win-library/2.15/RcppArmadillo/include" -I"d:/RCompile/CRANpkg/extralibs64/local/include" -O2 -Wall -mtune=core2 -c test_arma3.cpp -o test_arma3.o g++ -m64 -shared -s -static-libgcc -o NewPackage.dll tmp.def RcppExports.o test_arma3.o C:/Users/Howard/Documents/R/win-library/2.15/Rcpp/lib/x64/libRcpp.a -Ld:/RCompile/CRANpkg/extralibs64/local/lib/x64 -Ld:/RCompile/CRANpkg/extralibs64/local/lib -LC:/R/R-2-15-2/bin/x64 -lR test_arma3.o:test_arma3.cpp:(.text+0xae4): undefined reference to `dgemm_' test_arma3.o:test_arma3.cpp:(.text+0x19db): undefined reference to `dgemm_' test_arma3.o:test_arma3.cpp:(.text+0x1b0c): undefined reference to `dgemv_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma6auxlib8solve_odIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EE[_ZN4arma6auxlib8solve_odIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EE]+0x702): undefined reference to `dgels_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma6auxlib8solve_udIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EE[_ZN4arma6auxlib8solve_udIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EE]+0x51c): undefined reference to `dgels_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma6auxlib10det_lapackIdEET_RKNS_3MatIS2_EEb[_ZN4arma6auxlib10det_lapackIdEET_RKNS_3MatIS2_EEb]+0x14b): undefined reference to `dgetrf_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma6auxlib5solveIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EEb[_ZN4arma6auxlib5solveIdNS_3MatIdEEEEbRNS2_IT_EES6_RKNS_4BaseIS4_T0_EEb]+0x375): undefined reference to `dgesv_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma4gemvILb1ELb0ELb0EE15apply_blas_typeIdEEvPT_RKNS_3MatIS3_EEPKS3_S3_S3_[_ZN4arma4gemvILb1ELb0ELb0EE15apply_blas_typeIdEEvPT_RKNS_3MatIS3_EEPKS3_S3_S3_]+0x17d): undefined reference to `dgemv_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma27glue_times_redirect2_helperILb1EE5applyINS_2OpINS_3MatIdEENS_9op_htransEEES5_EEvRNS4_INT_9elem_typeEEERKNS_4GlueIS8_T0_NS_10glue_timesEEE[_ZN4arma27glue_times_redirect2_helperILb1EE5applyINS_2OpINS_3MatIdEENS_9op_htransEEES5_EEvRNS4_INT_9elem_typeEEERKNS_4GlueIS8_T0_NS_10glue_timesEEE]+0x37a): undefined reference to `dgemm_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x2c1): undefined reference to `dgetrf_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x322): undefined reference to `dgetri_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x398): undefined reference to `dgetri_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x775): undefined reference to `dgetrf_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x7d6): undefined reference to `dgetri_' test_arma3.o:test_arma3.cpp:(.text$_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE[_ZN4arma10op_diagvec5applyINS_2OpINS_4GlueINS2_INS_3MatIdEENS_9op_htransEEES5_NS_10glue_timesEEENS_6op_invEEEEEvRNS4_INT_9elem_typeEEERKNS2_ISC_S0_EE]+0x892): undefined reference to `dgetri_' collect2: ld returned 1 exit status ERROR: compilation failed for package 'NewPackage' * removing 'C:/Users/Howard/Documents/R/win-library/2.15/NewPackage' * restoring previous 'C:/Users/Howard/Documents/R/win-library/2.15/NewPackage' Exited with status 1.

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  • USB drive errors after airport scan

    - by bobobobo
    Well, I just got a new PNY usb drive and it passed through an airport scanner yesterday. For some reason, I wrote to it and then tried to read from it today, and it gave me a corrupted error! chkdsk reports errors like: Bad links in lost chain at cluster 1179 corrected. Lost chain cross-linked at cluster 1200. Orphan truncated. Lost chain cross-linked at cluster 1228. Orphan truncated. Lost chain cross-linked at cluster 1236. Orphan truncated. Lost chain cross-linked at cluster 1237. Orphan truncated. Lost chain cross-linked at cluster 1244. Orphan truncated. Lost chain cross-linked at cluster 1250. Orphan truncated. Lost chain cross-linked at cluster 1266. Orphan truncated. Lost chain cross-linked at cluster 1278. Orphan truncated. etc. What is this from? Could it possibly be from the airport scanner, or is it likely a defective USB chip? How can I check the chip to see if I should just return/throw it away or continue to use it?

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  • Firefox and Chrome do not support cross-domian ajax by default?

    - by Ethan
    The following code works as expected in IE8 and Safari4, but not work in Firefox3.6 and Chrome. All browsers are on Windows. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/smoothness/jquery-ui.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script> <script type="text/javascript"> $(function() { $('#tabs').tabs(); }); </script> </head> <body> <div id="tabs"> <ul> <li><a href="http://www.google.com/">Google</a></li> <li><a href="http://www.msn.com/">MSN</a></li> </ul> </div> </body> </html> Seems that Firefox and Chrome do not support cross-domian ajax by default, right? Is there any easy way to turn on cross-domian ajax in Firefox and Chrome?

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  • Is it still true, to make cross broswer layouts for desktop browsers using table+css is easier then

    - by metal-gear-solid
    My one of web designer friend still making sites with table but he use css very nicely and I also use css nicely but with <div> and i face cross browser problem in layout more than my friend. and i given some reason to my friend about cons of <table>. read my whole discussion with friend? I - you site will be problematic with screen reader My friend - OK, but i never got any call from any client regarding this. I - you will devote more time to make any changes in layout, if changes comes from client My friend - I don't think so, but if it is then show me how can i save time with <div>? I - your sites will not work well with search engine. My friend - it's not true. I've made many site and no problem with any site or client regarding this I - layout is old way, non w3c and non standard way. My friend - what is old and what is new, Who is W3C i don't know, What is standard? Whatever i make works in all browsers, it's enough for me and my client will not pay for standard and W3C guidelines rules I - Your site will not work in mobile browsers My friend - No problem for me, my client don't care about mobile phone I - Your sites are not accessible? My Friend - What do u mean not accessible? Whatever i make works in all browsers. my any client never asked about accessibility I - You will not get more work in future, with table? My friend - OK, no problem when clients will not accept site with table then i will learn about div based layouts in future. My questions? Is it still true, to make cross browser layouts for desktop browsers using table+css is easier then div+css? What is the benefit for developer to use DIV+CSS layout in place of <table> layouts if client would not mind if i use ?

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  • Can someone find me a reference to this quote?

    - by Robot
    I'm looking for a reasonable reference to a known software personality who said something along the lines "make sure your software runs the most common cases fast/easy but all cases are possible". I'm sure there are many 80/20 quotes, so I'm looking for the most famous that gets that point across. -Robot

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