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  • Let and construct versus let in sequence

    - by Stringer
    Consider this OCaml code: let coupe_inter i j cases = let lcases = Array.length cases in let low,_,_ = cases.(i) and _,high,_ = cases.(j) in low,high, Array.sub cases i (j-i+1), case_append (Array.sub cases 0 i) (Array.sub cases (j+1) (lcases-(j+1))) Why the expression let ... and ... in is used in place of a let ... in let ... in sequence (like F# force you to do)? This construct seems quite frequent in OCaml code. Thanks!

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  • Why is "display: table-cell" messing up my div's?

    - by eric01
    I'm trying to center the strings "1","2" and "3" vertically as seen here: But when I use display: table-cell; vertical-align: middle; for all 3 div's, but then I get his unwanted result: HTML is <div id='alldivs'> <div id='red' class='each_div'>1</div> <div id='blue' class='each_div'>2</div> <div id='green' class='each_div'>3</div> </div> CSS is .each_div { width: 80px; height: 50px; text-align: center; display: table-cell; vertical-align: middle; } Demo How do I keep the 3 div's aligned vertically while keeping vertical alignment within each div?

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  • C#: Union of two ICollections? (equivlaent of Java's addAll())

    - by Rosarch
    I have two ICollections of which I would like to take the union. Currently, I'm doing this with a foreach loop, but that feels verbose and hideous. What is the C# equivalent of Java's addAll()? Example of this problem: ICollection<IDictionary<string, string>> result = new HashSet<IDictionary<string, string>>(); // ... ICollection<IDictionary<string, string>> fromSubTree = GetAllTypeWithin(elementName, element); foreach (IDictionary<string, string> dict in fromSubTree) // hacky { result.Add(dict); } // result is now the union of the two sets

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  • Why do so many mathematicians format code so poorly? [closed]

    - by marcog
    I have done a fair amount of programming together with mathematicians. Now I am even teaching some high school kids coming from a mathematics background how to program. Most of these people format their code so hideously it's hard to believe. I've even worked with and taught mathematicians who will fight the auto-indenter! Why is this so common amongst mathematicians? BTW, this is one reason I have started teaching Python. Yet still they find ways other than indentation to produce whacked coding styles!

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  • Should .net comments start with a capital letter and end with a period?

    - by Hamish Grubijan
    Depending on the feedback I get, I might raise this "standard" with my colleagues. This might become a custom StyleCop rule. is there one written already? So, Stylecop already dictates this for summary, param, and return documentation tags. Do you think it makes sense to demand the same from comments? On related note: if a comment is already long, then should it be written as a proper sentence? For example (perhaps I tried too hard to illustrate a bad comment): //if exception quit vs. // If an exception occurred, then quit. If figured - most of the time, if one bothers to write a comment, then it might as well be informative. Consider these two samples: //if exception quit if (exc != null) { Application.Exit(-1); } and // If an exception occurred, then quit. if (exc != null) { Application.Exit(-1); } Arguably, one does not need a comment at all, but since one is provided, I would think that the second one is better. Please back up your opinion. Do you have a good reference for the art of commenting, particularly if it relates to .Net? Thanks.

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  • Navbar Dropdown in Bootstrap 3

    - by user2333842
    I recently started learning and using Bootstrap 3. I figured I would start with something simple- a header and a dropdown bar. I used the code from the Bootstrap website. I started out with the basic Bootstrap template, then added the bootstrap navbar. This is my code so far. <!DOCTYPE html> <html> <head> <title>WEBSITE NAME</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Bootstrap --> <link href="css/bootstrap.min.css" rel="stylesheet" media="screen"> <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries --> <!--[if lt IE 9]> <script src="../../assets/js/html5shiv.js"></script> <script src="../../assets/js/respond.min.js"></script> <![endif]--> </head> <body> <h1>WEBSITE NAME</h1> <nav class="navbar navbar-default" role="navigation"> <!-- Brand and toggle get grouped for better mobile display --> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> </div> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse navbar-ex1-collapse"> <ul class="nav navbar-nav"> <li class="active"><a href="#">Home</a></li> <li><a href="#">Tutorials</a></li> <li><a href="#">Software</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a> <ul class="dropdown-menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li><a href="#">Separated link</a></li> <li><a href="#">One more separated link</a></li> </ul> </li> </ul> <form class="navbar-form navbar-left" role="search"> <div class="form-group"> <input type="text" class="form-control" placeholder="Search"> </div> <button type="submit" class="btn btn-default">Submit</button> </form> <ul class="nav navbar-nav navbar-right"> <li><a href="https://twitter.com/"><span class="glyphicon glyphicon-comment"></span> Twitter</a></li> <li><a href="https://youtube.com/"><span class="glyphicon glyphicon-facetime-video"></span> YouTube</a></li> </ul> </li> </ul> </div><!-- /.navbar-collapse --> </nav> <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --> <script src="//code.jquery.com/jquery.js"></script> <!-- Include all compiled plugins (below), or include individual files as needed --> <script src="js/bootstrap.min.js"></script> </body> </html> The dropdown menu is absolutely not working at all- hovering or clicking it. What do I need to do?

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  • C++ iterators & loop optimization

    - by Quantum7
    I see a lot of c++ code that looks like this: for( const_iterator it = list.begin(), const_iterator ite = list.end(); it != ite; ++it) As opposed to the more concise version: for( const_iterator it = list.begin(); it != list.end(); ++it) Will there be any difference in speed between these two conventions? Naively the first will be slightly faster since list.end() is only called once. But since the iterator is const, it seems like the compiler will pull this test out of the loop, generating equivalent assembly for both.

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  • How to use SQLiteOpenHelper without or less restrictive use of Context?

    - by Pentium10
    If you extend SQLiteOpenHelper, for the Constructor you have to use a Context. I am wondering if there is a way to leave this out, and be able to work with database tables without a Context. Or at least be least restrictive, I mean a way of project/class structure that will make history the several context passings I have to do now. As it is my application has several level of classes, chained in each other, and there are a few that connects to the database, but have no whatsoever influence on the interface, so they don't actually need the Context. Are you creating your classes in the way that you pass each time a Context to them? If not, how you do, how you reuse a Context in a short class?

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  • Center aligning list of images

    - by Praneeth
    Can some CSS guru help me getting this layout. What I have here is <div class="movieList"> <div class="image" selected = true> <img class="poster" src="image1" selected = true/> </div> <div class="image"> <img class="poster" src="image1"/> </div> <div class="image"> <img class="poster" src="image2"/> </div> . . </div> Thanks

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  • how to set length and postion for repeat-x and scroll background-image?

    - by user550945
    Hi all, I have an to set background image. it is a red line under the input value. background-attachment:scroll; background-color:#FFFFFF; background-image:url("../images/errorLine.gif"); background-position:left bottom; background-repeat:repeat-x; the input value is like "123; 456; 789;". the red line cover all the string, its length is the same as the input width. Is there any way to make the red line only under the "456;"? Is there anyway to do it by CSS? Thanks a lot. Best regards, Ryanivanka

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  • Acceptable to have spaces before dot?

    - by Rudy
    What is the general opinion on the 2nd indentation method below. // Normal indentation a.Value = "foobar"; ab.Checked = false; foo.Value = "foobar"; foobar.Checked = true; // Spaces before the dot to align the properties/methods a .Value = "foobar"; ab .Checked = false; foo .Value = "foobar"; foobar.Checked = true; This should probably be a wiki, but I either don't have enough privileges or don't know how to change it.

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  • Scrolling Panel Printing Issue

    - by Paul
    Hi I have a site where we have the content in scrolling panels to make it neater and line up. The issue comes when trying to print the contents of my panel hidden by the scroll. Here is my panel <asp:Panel Height="400px" ID="pnlContent" class="ContentPanel ScrollBars="Vertical" runat="server" > <!-- Content bla bla bla --> </asp:Panel> Here is my media="print" style sheet code for the ContentPanel .ContentScroller { overflow:visible; } The overflow:visible does not seem to remover the ScrollBars="Vertical" Any ideas on how to get this hidden content to print?

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  • Purpose of IF, ELSE, FOR macros ?

    - by psihodelia
    I have a source code of a library which has a lot of strange IF, ELSE, FOR, etc. macros for all common C-keywords instead of using just usual if,else,for,while keywords. These macros are defined like this: #define IF( a) if( increment_if(), a) where increment_if() function is defined so: static __inline void increment_if( void) { // If the "IF" operator comes just after an "ELSE", its counter // must not be incremented. ... //implementation } I don't really understand, what is the purpose of such macros? This library is for a real-time application and I suppose that using such macros must slow-down an application.

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  • Overlapping elements stop overlapping in IE7 on class change

    - by Gazzer
    On this page http://zenchan.com/program/ When I rollover the right box 2nd from the top suddenly the overlapping (negative margin disappears). What's happening is that a 'hover' class is being added to shift the background sprite. The two yellow boxes are debugging: if the hover class is put their in advance there is no problem. So fundamentally the CSS is not a problem for IE7 but adding the class is. Any ideas what's causing this. I've tried adding haslayout to various elements but to little effect.

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  • Rvalues in C++03

    - by DeadMG
    How can you tell whether or not a given parameter is an rvalue in C++03? I'm writing some very generic code and am in need of taking a reference if possible, or constructing a new object otherwise. Can I overload to take by-value as well as by-reference and have the rvalue returns call the by-value function? Or do I have a very sickening feeling that this is why rvalue references are in C++0x?

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  • Semantic #region usage

    - by Luca
    What's your opinion about using #region folding using application semantic, instead of folding for "syntax". For example: #region Application Loop #region User Management #region This Kinf of stuffs instead of #region Private Routines #region Public Properties #region ThisRoutine // (Yes, I've seen this also!) In this logic, I'm starting fold even routine bodies. I'm starting to love #region directive (even using #pragma region when using C++!).

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  • Transparent Select/Option text in IE

    - by Valchris
    I've created the JS fiddle to demonstrate my problem: http://jsfiddle.net/C8NUf/1/ HTML: <select> <option> Test </option> <option> Another Test </option> </select> Style: select { color: transparent; } In chrome, the selected text "test" is properly blanked out by setting the color to transparent, in IE the test is still black. How can I fix this issue in IE? Ideally I want to make this change via JQuery, but that doesn't seem very relevant to the overall problem. Thanks, Daniel

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  • Does any language have a while-else flow structure?

    - by dotancohen
    Consider this flow structure which I happen to use often: if ( hasPosts() ) { while ( hasPosts() ) { displayNextPost(); } } else { displayNoPostsContent(); } Are there any programming languages which have an optional else clause for while, which is to be run if the while loop is never entered? Thus, the code above would become: while ( hasPosts() ) { displayNextPost(); } else { displayNoPostsContent(); } I find it interesting that many languages have the do-while construct (run the while code once before checking the condition) yet I have never seen while-else addressed. There is precedent for running an N block of code based on what was run in N-1 block, such as the try-catch construct. I wasn't sure whether to post here or on programmers.SE. If this question is more appropriate there, then please move it. Thanks.

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  • z index background issue in IE

    - by Michael
    I have a jQuery tools scroller set up with controls managing two separate divs of info - one images, the other related text that needs to sit over the top of the images with a transparent bg image. I am using z-indexing to achieve this and am aware of IE's issues with this but am unable to sort it (tested in IE6-8). Image of the issue below: http://test.shakingpaper.com.au/not_working.png It seems that the overlayed div is taking on the containers white. Try as I might, I can't resolve this. HTML/CSS code below: <div id="content"> <div id="nav"></div> <div class="s4 slideshow"> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> </div> <div id="overlay_bg"></div> <div class="s4 information"> <div> <h1>Support</h1> <p>Quisque lacus quam, egestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Support Us</a></p> </div> <div> <h1>Events</h1> <p>Quisque lacegestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Read More</a></p> </div> <div> <h1>Regional</h1> <p>Quisque lacus quam, egestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Support Us</a></p> </div> </div> </div> <!-- end of content --> #content { height: auto; min-height: 300px !important; overflow: hidden; position:relative; margin-left: 27px; width: 770px; padding-bottom: 43px; } #nav { width: 60px; z-index: 10000; position: absolute; top:340px; left: 28px; } .s4 { width: 770px; height: 370px; overflow: hidden; } #nav a { background-color: transparent; background-image: url(images/transition.png); background-position: 0 0; text-indent: -1000em; width: 10px; height: 10px; display: block; float: left; margin-right: 5px; } #nav a.activeSlide { background-position: 0 -10px; } #overlay_bg { background: url(images/soild_block.png) no-repeat; width: 318px; height: 339px; z-index: 5000; position: absolute; top: 28px; } .information { position: absolute; top: 60px; left: 28px; z-index: 16000; width: 290px; height: 260px; color: #FFF; } .information h1 { font-size: 50px; font-style: italic; text-transform: uppercase; } .information p { font-size: 17px; line-height: 27px; margin-top: 37px; } .information a { font-size: 13px; padding-bottom: 2px; border-bottom: 1px solid; color: #FFF; text-transform: uppercase; font-style: italic; } .information a:hover { color: #000; } Any help would be greatly appreciated.

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  • Is it a good idea to apply some basic macros to simplify code in a large project?

    - by DoctorT
    I've been working on a foundational c++ library for some time now, and there are a variety of ideas I've had that could really simplify the code writing and managing process. One of these is the concept of introducing some macros to help simplify statements that appear very often, but are a bit more complicated than should be necessary. For example, I've come up with this basic macro to simplify the most common type of for loop: #define loop(v,n) for(unsigned long v=0; v<n; ++v) This would enable you to replace those clunky for loops you see so much of: for (int i = 0, i < max_things; i++) With something much easier to write, and even slightly more efficient: loop (i, max_things) Is it a good idea to use conventions like this? Are there any problems you might run into with different types of compilers? Would it just be too confusing for someone unfamiliar with the macro(s)?

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  • Creating triangles using borders

    - by Interstellar_Coder
    I recently needed to create speech bubbles. To create the little tip at the end of the speech bubble, i used a css technique where the element is given a 0 width and 0 height and given borders. Making certain borders transparent would create diagonals. This works great, and i am able to manipulate different borders to create triangles/shapes to my liking. The problem is, i don't fully understand why this works. I understand that it all starts out with a rectangle and as you set one or more of the borders to transparent it creates a diagonal. My question is how does this work ? And why does it create a diagonal in the first place ? EDIT: To clarify, i would like to know the theory behind why this technique works.

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  • How to align checkboxes and their labels consistently cross-browsers

    - by One Crayon
    This is one of the minor CSS problems that plagues me constantly. How do folks around StackOverflow vertically align checkboxes and their labels consistently cross-browser? Whenever I align them right in Safari (usually using vertical-align: baseline on the input), they're completely off in Firefox and IE. Fix it in Firefox, and Safari and IE are inevitably messed up. I waste time on this every time I code a form. Here's the standard code that I work with: <form> <div> <label><input type="checkbox" /> Label text</label> </div> </form> I usually use Eric Meyer's reset, so form elements are relatively clean of overrides. Looking forward to any tips or tricks that you have to offer!

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  • What causes extra space and random alignment in my divs using the 960 grid system?

    - by tomdot
    I have an issue where elements in divs seemingly align randomly, not responding to any align tag, and where divs create extra space above or below its element. I'm using the 960 grid system and I have not altered the stock CSS file lest my fingers blow it up. I've put up a test page here, and please excuse some of the dodgy code :-D It's still in it's very early stages (as am I), but I don't feel I can move on until I can comfortably understand what is causing the issue. The best example on that page is the bottom horizontal bar and elements underneath. The bar adds a few pixels of dead space, and the elements below that align to different parts of their respective divs. Why is it that elements seemingly do not standardise their alignment given no instruction, and what causes extra space again where no instruction was given? My own thought was to relatively position everything individually, but I'm worried this will cause issues and 'break' the grid. Other than that, I unno. Thanks

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