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How do I implement an Objective-C singleton that is compatible with ARC?
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In exactly the same way that you (should) have been doing it already:
+ (instancetype)sharedInstance
{
static MyClass *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[MyClass alloc] init];
// Do any ...
Android List Preferences: have summary as selected value?
...ou need API >= 11 for "%s" ? In my tests, "%s" doesn't work with Gingerbread and earlier versions.
– andreas1724
Mar 14 '16 at 23:56
1
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How can I beautify JavaScript code using Command Line?
...retty Print/Beautifier from step 1 to write a small shell script that will read in your javascript file and run it through the Pretty Print/Beautifier from step one. For example
//original code
(function() { ... js_beautify code ... }());
//new code
print(global.js_beautify(readFile(arguments...
Are negative array indexes allowed in C?
I was just reading some code and found that the person was using arr[-2] to access the 2nd element before the arr , like so:
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Open two instances of a file in a single Visual Studio session
...o edit the registry for C# files as the 'New Window' menu item should be already enabled for C# files (in VS 2010). You only need to do this for VB, HTML or JScript. According to this MS Connect issue report any issues with this are fixed for VB, you just need to remove or rename the registry entry ...
Declaring an unsigned int in Java
...g the ability to use unsigned datatypes. From the various sources online I read from, it seems like it revolves around just widening the maximum value, and the implicit by nature guarantee that it's a positive number. Is my understanding correct, or are there other major reasons? Also, now that the ...
How to write inline if statement for print?
...n always write the regular if statement on a single line, though it's less readable and there is really no reason to avoid the two-line variant.
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How to detect if a script is being sourced
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After reading @DennisWilliamson's answer, there are some issues, see below:
As this question stand for ksh and bash, there is another part in this answer concerning ksh... see below.
Simple bash way
[ "$0" = "$BASH_SOURCE" ]
L...
Regex to get string between curly braces
...use the position is zero-based, i.e. g.length-1 is the last position.
For readers other than the original poster: If it has to be a regex, use /{([^}]*)}/ if you want to allow empty strings, or /{([^}]+)}/ if you want to only match when there is at least one character between the curly braces. Bre...
How to make fill height
... That could work. Let me get back to you when I've tried. I did read up on the subject and understood that <div> needs a specified height to be able to scale to 100%. From what I read that was possible to do with jQuery though, since it can calculate it for me.
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