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Why should the “PIMPL” idiom be used? [duplicate]

...() to be able to use private members of CatImpl. Cat::Purr() would not be allowed such an access without a friend declaration. Because you then don't mix responsibilities: one class implements, one class forwards. share...
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What is the difference between a generative and a discriminative algorithm?

...|x) - which you should read as "the probability of y given x". Here's a really simple example. Suppose you have the following data in the form (x,y): (1,0), (1,0), (2,0), (2, 1) p(x,y) is y=0 y=1 ----------- x=1 | 1/2 0 x=2 | 1/4 1/4 p(y|x) is y=0 y=1 -----------...
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How to Set Variables in a Laravel Blade Template

...ise within the view). I don't want to build the title in each controller call, I just want to send the view the page number - just in case some day I want to change the base title. I'm using <?php $title = ... ?> now, but is there a more correct way? – jdavidbakr ...
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Enabling auto layout in iOS 6 while remaining backwards compatible with iOS 5

...ve of your .app file. Does having two targets make that process harder at all? Thanks. – Crystal May 16 '13 at 2:55 add a comment  |  ...
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How does '20 seconds' work in Scala?

... There are a few things going on. First, Scala allows dots and parens to be omitted from many method calls, so 20 seconds is equivalent to 20.seconds()*. Second, an "implicit conversion" is applied. Since 20 is an Int and Int has no seconds method, the compiler searches ...
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Return XML from a controller's action in as an ActionResult?

...aled class XmlActionResult : ActionResult { private readonly XDocument _document; public Formatting Formatting { get; set; } public string MimeType { get; set; } public XmlActionResult(XDocument document) { if (document == null) throw new ArgumentNullExcepti...
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How do I sort an array of hashes by a value in the hash?

... Actually, Array#sort_by! is new in Ruby 1.9.2. Available today to all Ruby version by requiring my backports gem too :-) – Marc-André Lafortune Jul 1 '10 at 4:19 ...
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Javascript checkbox onChange

... Here's a JsFiddle where all the different ways can be tested: click, keyboard, label and accesskey. They all trigger the event in Firefox. – Roman Starkov May 8 '15 at 12:59 ...
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Long press gesture on UICollectionViewCell

...ILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; lpgr.delegate = self; lpgr.delaysTouchesBegan = YES; [self.collectionView addGestureRecognizer:lpgr]; } -(void)handleLongPress:...
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Disable sorting for a particular column in jQuery DataTables

...nType" : "bootstrap", "oLanguage" : { "sLengthMenu" : "_MENU_ records per page" }, // Disable sorting on the first column "aoColumnDefs" : [ { 'bSortable' : false, 'aTargets' : [ 0 ] } ] }); }); EDIT: You can disable ...