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What is your single most favorite command-line trick using Bash? [closed]
...es with suffixes quickly:
cp /home/foo/realllylongname.cpp{,-old}
This expands to:
cp /home/foo/realllylongname.cpp /home/foo/realllylongname.cpp-old
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answered Sep 16 '0...
How to connect android emulator to the internet
How can I connect my Android emulator to the internet, e.g. to use the browser? I've found lots of advice on what do to when your connected through a proxy, but that's not the case here, my machine (Windows 7) is directly connected to the router.
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How to Implement Custom Table View Section Headers and Footers with Storyboard
...ue id and viewForHeaderInSection you can dequeue the cell with that ID and cast it to a UIView.
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How can I turn a List of Lists into a List in Java 8?
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If you need to do explicit casting (array of primitives to List for example) then lambdas may be necessary as well.
– Michael Fulton
May 28 '17 at 3:58
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How do I find the location of my Python site-packages directory?
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There are two types of site-packages directories, global and per user.
Global site-packages ("dist-packages") directories are listed in sys.path when you run:
python -m site
For a more concise list run getsitepackages from the site module in Python code:
python -c 'import sit...
How can I mask a UIImageView?
...! But i have two troubles : Warning on "kCGImageAlphaPremultipliedLast" (i cast to "CGBitmapInfo" for fix it) AND does not work for retina images !! can you help me ??...
– fingerup
Apr 21 '15 at 9:14
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C++ code file extension? .cc vs .cpp [closed]
I have seen C++ code saved as both .cc and .cpp files. Is there a difference between the two?
17 Answers
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...bunch of mutexes or a single one for an object.
If you have many threads and the access to the object happens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e....
Remove insignificant trailing zeros from a number?
...55555).toFixed(2);
//-> "4.56"
(4).toFixed(2);
//-> "4.00"
If you cast the return value to a number, those trailing zeroes will be dropped. This is a simpler approach than doing your own rounding or truncation math.
+(4.55555).toFixed(2);
//-> 4.56
+(4).toFixed(2);
//-> 4
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Programmatically add custom event in the iPhone Calendar
... access to the user's calendar via "requestAccessToEntityType:completion:" and execute the event handling inside of a block.
2) You need to commit your event now or pass the "commit" param to your save/remove call
Everything else stays the same...
Add the EventKit framework and #import <EventK...