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Objective-C Runtime: best way to check if class conforms to protocol?
I have a Class (but no instance) and need to know if it conforms to a certain protocol. However, Class can be subclassed several times and class_conformsToProtocol() ignores protocols declared on superclasses.
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Generic TryParse
... edited Jan 9 '17 at 7:57
meJustAndrew
4,44244 gold badges3434 silver badges6161 bronze badges
answered Jun 2 '10 at 21:23
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How to avoid annoying error “declared and not used”
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That error is here to force you to write better code, and be sure to use everything you declare or import. It makes it easier to read code written by other people (you are always sure that all declared variables will be used), and avoid some possible dead code.
But, if you real...
How to set the style -webkit-transform dynamically using JavaScript?
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The JavaScript style names are WebkitTransformOrigin and WebkitTransform
element.style.webkitTransform = "rotate(-2deg)";
Check the DOM extension reference for WebKit here.
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PHP substring extraction. Get the string before the first '/' or the whole string
...me/cat1/subcat2/';
$first = strtok($mystring, '/');
echo $first; // home
and
$mystring = 'home';
$first = strtok($mystring, '/');
echo $first; // home
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Undo git mv (rename)
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Non-cheeky answer:
git mv file2 file1
Updates the index for both old and new paths automatically.
Check documentation of git mv
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Arrow operator (->) usage in C
...g a book called "Teach Yourself C in 21 Days" (I have already learned Java and C# so I am moving at a much faster pace). I was reading the chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions (like the equivalent of...
What does the tilde (~) mean in my composer.json file?
...o put it is that the ~ allows the last digit to go up. e.g. ~2.2 means 2.2 and any 2.x where x is 2 or above. ~2.1.3 on the is also any 2.1.x where x is 3 or above.
– Seldaek
Sep 24 '13 at 11:36
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Why is a ConcurrentModificationException thrown and how to debug it
... (a HashMap used indirectly by the JPA, it so happens), but apparently randomly the code throws a ConcurrentModificationException . What is causing it and how do I fix this problem? By using some synchronization, perhaps?
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Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
...s say you have 4 cores:
With IRIX mode on, 1 fully utilized core is 100% and 4 cores are 400%.
With IRIX mode off, 1 fully utilized core is 25% and 4 cores are 100%.
This means that by default, top on Linux will show an infinite loop as ~100% and Windows will show it as ~25%, and it means exac...