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What should my Objective-C singleton look like? [closed]
...s is not used.) The runtime sends the initialize message to classes in a thread-safe manner. Superclasses receive this message before their subclasses.
So you could do something akin to this:
static MySingleton *sharedSingleton;
+ (void)initialize
{
static BOOL initialized = NO;
if(!init...
Is there a standardized method to swap two variables in Python?
...for this subject. It's quite interesting and I would like to have a futher read. Thanks.
– Catbuilts
Sep 16 '19 at 11:35
2
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How to pip install a package with min and max version range?
...so use:
pip install package==0.5.*
which is more consistent and easy to read.
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How does a debugger work?
... how does a debugger work? Particulary the one that can be 'attached' to already running executable. I understand that compiler translates code to machine language, but then how does debugger 'know' what it is being attached to?
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Where should signal handlers live in a django project?
...e of the application they relate to. Signal receivers are connected in the ready() method of your application configuration class. If you’re using the receiver() decorator, simply import the signals submodule inside ready().
Changed in Django 1.7: Since ready() didn’t exist in previous vers...
in iPhone App How to detect the screen resolution of the device
...iplying by the screen's scale you get the actual pixel resolution.
A good read on the difference between points and pixels in iOS can be read here.
EDIT: (Version for Swift)
let screenBounds = UIScreen.main.bounds
let screenScale = UIScreen.main.scale
let screenSize = CGSize(width: screenBounds.s...
Pip freeze vs. pip list
...pecify ==1.4.2, the latest version available would be installed.
You can read more in "Virtualenv and pip Basics",
and the official "Requirements File Format" documentation.
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Can “git pull --all” update all my local branches?
...years old, but I asked myself the very same question and did not found any ready made solution. So, I created a custom git command shell script my self.
Here it goes, the git-ffwd-update script does the following...
it issues a git remote update to fetch the lates revs
then uses git remote show ...
What are the differences between struct and class in C++?
This question was already asked in the context of C#/.Net .
30 Answers
30
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Can unit testing be successfully added into an existing production project? If so, how and is it wor
...he last big project I was involved with where I did this the product was already in production with zero unit tests when I arrived to the team. When I left - 2 years later - we had 4500+ or so tests yielding about 33 % code coverage in a code base with 230 000 + production LOC (real time financial W...