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How do I declare class-level properties in Objective-C?

...mething that's equivalent to a static variable? E.g. only one instance for all types of Foo? To declare class functions in Objective-C you use the + prefix instead of - so your implementation would look something like: // Foo.h @interface Foo { } + (NSDictionary *)dictionary; // Foo.m + (NSDicti...
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Should a return statement be inside or outside a lock?

... L_0011: stloc.0 L_0012: leave.s L_001b L_0014: ldloc.1 L_0015: call void [mscorlib]System.Threading.Monitor::Exit(object) L_001a: endfinally L_001b: ldloc.0 L_001c: ret .try L_000c to L_0014 finally handler L_0014 to L_001b } method private hidebysig static int32...
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How do I get the filepath for a class in Python?

...e=\"evenodd\" d=\"M25.6622 17.6335C27.8049 17.6335 29.3739 16.9402 30.2537 15.6379C30.8468 14.7755 30.9615 13.5579 30.9615 11.9512V6.59049C30.9615 5.28821 30.4833 4.66231 29.4502 4.66231C28.9913 4.66231 28.4555 4.94978 28.1109 5.50789C27.499 4.86533 26.7335 4.56087 25.7005 4.56087C23.1369 4.56087 21...
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Concurrent.futures vs Multiprocessing in Python 3

... I wouldn't call concurrent.futures more "advanced" - it's a simpler interface that works very much the same regardless of whether you use multiple threads or multiple processes as the underlying parallelization gimmick. So, like virtuall...
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remove None value from a list without removing the 0 value

...lakjamylak 104k2222 gold badges206206 silver badges215215 bronze badges 23 ...
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How can I find where I will be redirected using cURL?

...topt($ch, CURLOPT_FOLLOWLOCATION, true); Erm... I don't think you're actually executing the curl... Try: curl_exec($ch); ...after setting the options, and before the curl_getinfo() call. EDIT: If you just want to find out where a page redirects to, I'd use the advice here, and just use Curl to ...
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Oracle TNS names not showing when adding new connection to SQL Developer

...cognized, use the following procedure: Define an environmental variable called TNS_ADMIN to point to the folder that contains your tnsnames.ora file. In Windows, this is done by navigating to Control Panel > System > Advanced system settings > Environment Variables... In Linux, define...
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How to obtain a Thread id in Python?

... Using the logging module you can automatically add the current thread identifier in each log entry. Just use one of these LogRecord mapping keys in your logger format string: %(thread)d : Thread ID (if available). %(threadName)s : Thread name (if available). a...
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Difference Between One-to-Many, Many-to-One and Many-to-Many?

...to a skill, but the skill need not relate back to just those people. Typically it would, but such symmetry is not a requirement. Take love, for example -- it is bi-directional ("I-Love", "Loves-Me"), but often asymmetric ("I love her, but she doesn't love me")! All of these are well supported by H...
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Writing handler for UIAlertAction

...ActionStyle.Destructive,handler: { action in print("pressed") })) All the answers above are correct i am just showing another way that can be done. share | improve this answer | ...