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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...
SQL Switch/Case in 'where' clause
...elow, you formed the SQL incorrectly. I tested mine in SQLServer 2005 and it worked fine.
– Bob Probst
Oct 16 '08 at 0:48
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How to count total number of watches on a page?
...);
};
f(root);
// Remove duplicate watchers
var watchersWithoutDuplicates = [];
angular.forEach(watchers, function(item) {
if(watchersWithoutDuplicates.indexOf(item) < 0) {
watchersWithoutDuplicates.push(item);
}
});
console.log(watchers...
ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden
...e above mentioned error message whenever I try to type the URL of the web site. (Note: development machine: Vista Home Premium, IIS7)
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submitting a GET form with query string params and hidden params disappear
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Isn't that what hidden parameters are for to start with...?
<form action="http://www.example.com" method="GET">
<input type="hidden" name="a" value="1" />
<input type="hidden" name="b" value="2" />
<input type="hidden" name="c" value="3" />
&...
rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
I made a basic rails app with a simple pages controller with an index function and when I load the page I get:
14 Answers
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Tools for JPEG optimization? [closed]
...ate into our build environment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size.
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Find duplicate lines in a file and count how many time each line was duplicated?
...rt <file> | uniq -c
You can use the more verbose --count flag too with the GNU version, e.g., on Linux:
sort <file> | uniq --count
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How to ssh to vagrant without actually running “vagrant ssh”?
I would like to reproduce the way Vagrant logs in to my VM within a shell script using an ssh command, so I create an alias to my Vagrant instance.
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How to set size for local image using knitr for markdown?
... image that I would like to include in an .Rmd file which I will then knit and convert to HTML slides with Pandoc . Per this post , this will insert the local image :
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