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Why do we need C Unions?

...le types together: enum Type { INTS, FLOATS, DOUBLE }; struct S { Type s_type; union { int s_ints[2]; float s_floats[2]; double s_double; }; }; void do_something(struct S *s) { switch(s->s_type) { case INTS: // do something with s->s_ints break; case F...
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How to analyze a java thread dump?

I am trying to understand more about java, especially about memory management and threads. For this reason I have recently found interest in looking at thread dumps. ...
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Find location of a removable SD card

...l Android 4.4, the official Android platform has not supported SD cards at all except for two special cases: the old school storage layout where external storage is an SD card (which is still supported by the platform today), and a small feature added to Android 3.0 where it would scan additional SD...
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Laravel redirect back to original destination after login

...n Redirect::to($redirect); } }); // on controller public function get_login() { $this->layout->nest('content', 'auth.login'); } public function post_login() { $credentials = [ 'username' => Input::get('email'), 'password' => Input::get('password') ]; ...
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Callback when CSS3 transition finishes

...AnimationEnd MSAnimationEnd", function(){ ... }); Note that you can pass all of the browser prefixed event strings into the bind() method simultaneously to support the event firing on all browsers that support it. Update: Per the comment left by Duck: you use jQuery's .one() method to ensure the...
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What is Linux’s native GUI API?

...heir own APIs to handle windows, events and other OS stuff. I have never really got a clear answer as to what Linux’s equivalent is? ...
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How to use a RELATIVE path with AuthUserFile in htaccess?

... different versions in my codebase, and have the deployment process set it all up (i. e. replace placeholders or rename / move the appropriate file). On Java projects, I use Maven to do this type of work, on, say, PHP projects, I like to have a build.sh and / or install.sh shell script that tunes t...
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How to check if a symlink exists

... do you really see a difference between -L and -h ? in my bash ( version 4.2.53(1)-release (x86_64-redhat-linux-gnu ) man bash is identical for both -L and -h and they behave the same, ie they check that file actualy is a link and don'...
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jQuery validate: How to add a rule for regular expression validation?

... || re.test(value); }, "Please check your input." ); now all you need to do to validate against any regex is this: $("#Textbox").rules("add", { regex: "^[a-zA-Z'.\\s]{1,40}$" }) Additionally, it looks like there is a file called additional-methods.js that contains the method "pa...
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How to draw a custom UIView that is just a circle - iPhone app

How would I go about drawing a custom UIView that is literally just a ball (a 2D circle)? Would I just override the drawRect method? And can someone show me the code for drawing a blue circle? ...