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What should my Objective-C singleton look like? [closed]
...y and do something like [[MySingelton alloc] init] you will get a run time error (though not a compile time error unfortunately). I don't understand how all the details of the object creation, but you implement + (id) allocWithZone:(NSZone *)zone which is called in sharedSingleton
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How should equals and hashcode be implemented when using JPA and Hibernate
...d; otherwise you may end up with strange behavior (ultimately resulting in errors and / or data corruption) because your entity may be allocated to a bucket not matching its current hashCode().
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Using getopts to process long and short command line options
...comes with caveats:
getopts can't enforce the opt spec. It can't return errors if the user supplies an invalid option. You have to do your own error-checking as you parse OPTARG.
OPTARG is used for the long option name, which complicates usage when your long option itself has an argument. You end...
403 Forbidden vs 401 Unauthorized HTTP responses
...s a problem with 401 Unauthorized, the HTTP status code for authentication errors. And that’s just it: it’s for authentication, not authorization.
Receiving a 401 response is the server telling you, “you aren’t
authenticated–either not authenticated at all or authenticated
incorrectl...
self referential struct definition?
...ive things... I would like each cell to contain another cell, but I get an error along the lines of "field 'child' has incomplete type". What's up?
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Why is “import *” bad?
...ity).
Because you can't use cool tools like pyflakes to statically detect errors in your code.
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How to spread django unit tests over multiple files?
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This is great but I ran into an error where, when running an app level test (python manage.py test appName) the second bit of code would throw an error stating that __path__ was not available. I avoided it by wrapping the second snippet in a if '__path__'...
Can't pickle when using multiprocessing Pool.map()
...some way, anyhow: Using the code at pastebin.ca/1693348 I now get a RuntimeError: maximum recursion depth exceeded. I looked around and one forum post recommended increasing the maximum depth to 1500 (from the default 1000) but I had no joy there. To be honest, I can't see what part (of my code, at ...
How to check if a string is a valid date
...
require 'date'
begin
Date.parse("31-02-2010")
rescue ArgumentError
# handle invalid date
end
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Command prompt won't change directory to another drive
...ttempt to change to a directory on a different drive, it would give you an error message saying "ERROR - the file you're trying to access resides on another driver. Specify -d..."
– committedandroider
Oct 22 '19 at 22:21
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