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Using a dispatch_once singleton model in Swift
...edInstance: Singleton {
struct Static {
static var onceToken: dispatch_once_t = 0
static var instance: Singleton? = nil
}
dispatch_once(&Static.onceToken) {
Static.instance = Singleton()
}
return Static.instance!
}
}...
How do I select an element in jQuery by using a variable for the ID?
... having an ID that starts with a number is not valid HTML:
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
...
iOS start Background Thread
... Put a breakpoint in this line: SpotMain *mirror = [[SpotMain alloc] init]; and tell me if its hit and, if tehn, which line crashes. Enable zombies please so we can get a clear error log.
– Nicolas S
Aug 14 '11 at 7:16
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LINQ where vs takewhile
...
Indeed. It's also really useful for parsing a sequence of tokens.
– Aluan Haddad
Sep 4 at 21:50
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How to convert int to QString?
...
Then you probably want to work on pre-allocated buffers... but this sounds like a separate question.
– Georg Fritzsche
Apr 6 '17 at 4:45
a...
How to convert CFStringRef to NSString?
...ne fewer thing you need to release later. (CF uses Create where Cocoa uses alloc, so either way, you would have needed to release it.)
The resulting code:
NSString *escapedString;
NSString *unescapedString = [(NSString *) CFXMLCreateStringByUnescapingEntities(NULL, (CFStringRef) escapedString, NUL...
Grep regex NOT containing string
...rep -P (?<\!1\.2\.3\.4) test.log -bash: syntax error near unexpected token `('
– jwbensley
May 2 '12 at 10:20
Yo...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
...s'
There are things that your code cannot do from user mode - things like allocating memory or accessing hardware (HDD, network, etc.). These are under the supervision of the kernel, and it alone can do them. Some operations like malloc orfread/fwrite will invoke these kernel functions and that the...
Remove an onclick listener
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i wonder if listeners cause memory allocation ? Do we need to free them ? Will that raise performance of app ?
– alicanbatur
Nov 4 '13 at 11:42
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Expansion of variables inside single quotes in a command in Bash
...d of
repo forall -c '....$variable'
use printf to replace the variable token with the expanded variable.
For example:
template='.... %s'
repo forall -c $(printf "${template}" "${variable}")
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