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Difference between dispatch_async and dispatch_sync on serial queue?

...rialQueue, ^{ printf("3"); }); printf("4"); It may print 2413 or 2143 or 1234 but 1 always before 3 for this code dispatch_sync(_serialQueue, ^{ printf("1"); }); printf("2"); dispatch_sync(_serialQueue, ^{ printf("3"); }); printf("4"); it always print 1234 Note: For first code, it won't pri...
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Is “else if” a single keyword?

...They are not a single keyword if we go to the draft C++ standard section 2.12 Keywords table 4 lists both if and else separately and there is no else if keyword. We can find a more accessible list of C++ keywords by going to cppreferences section on keywords. The grammar in section 6.4 also makes ...
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How do you write tests for the argparse portion of a python module? [closed]

...ou should refactor your code and move the parsing to a function: def parse_args(args): parser = argparse.ArgumentParser(...) parser.add_argument... # ...Create your parser as you like... return parser.parse_args(args) Then in your main function you should just call it with: parse...
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Resolve Type from Class Name in a Different Assembly

... | edited Oct 2 '18 at 8:12 answered May 14 '16 at 12:32 s...
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Does this app use the Advertising Identifier (IDFA)? - AdMob 6.8.0

... ? – Rukshan Marapana Jul 29 '14 at 12:47 7 To clarify, the first box is the line: "Serve adverti...
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Unique fields that allow nulls in Django

...e DRY I suppose. – Ashish Gupta Dec 12 '15 at 10:52 6 ...
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Python date string to date object

... Jean-François Corbett 33.6k2525 gold badges124124 silver badges172172 bronze badges answered Mar 20 '15 at 6:53 SchopenhauerSchopenhauer ...
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nodejs get file name from absolute path?

...other platforms – OwnageIsMagic Jan 12 '18 at 23:10 @OwnageIsMagic Yes, it does indeed. Always use the methods of the ...
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Real world example about how to use property feature in python?

...changing terms. Complex calculation hidden behind an attribute: class PDB_Calculator(object): ... @property def protein_folding_angle(self): # number crunching, remote server calls, etc # all results in an angle set in 'some_angle' # It could also reference a ca...
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Getting the last argument passed to a shell script

... Laurence GonsalvesLaurence Gonsalves 120k2929 gold badges213213 silver badges259259 bronze badges ...