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Why are arrays covariant but generics are invariant?
...e array, so it should be possible to write a single function that works on all types of arrays. It is easy to implement functions of type
boolean equalArrays (Object[] a1, Object[] a2);
void shuffleArray(Object[] a);
However, if array types were treated as invariant, it would only be possible...
How do I use the lines of a file as arguments of a command?
...re using bash. I realize that there are other shells out there, but almost all of the *nix machines I have worked on either ran bash or some equivalent. IIRC, this syntax should work the same on ksh and zsh.
– Will
Nov 19 '10 at 21:43
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Allow multiple roles to access controller action
Right now I decorate a method like this to allow "members" to access my controller action
9 Answers
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Is there a JSON equivalent of XQuery/XPath?
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Yup, it's called JSONPath. The source is now on GitHub.
It's also integrated into DOJO.
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In Objective-C why should I check if self = [super init] is not nil?
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For example:
[[NSData alloc] initWithContentsOfFile:@"this/path/doesn't/exist/"];
[[NSImage alloc] initWithContentsOfFile:@"unsupportedFormat.sjt"];
[NSImage imageNamed:@"AnImageThatIsntInTheImageCache"];
... and so on. (Note: NSData might throw...
Do copyright dates need to be updated? [closed]
...e work.
Therefore, if the claim is based on common law copyright (not formally registered), then the date should be the date of first publication. If the claim is a registered copyright, then the date should be the date claimed in the registration. In cases where the work was substantially revised ...
What does the servlet value signify
... that this servlet should be loaded (instantiated
and have its
init() called) on the startup of the Web application. The element content of this
element must be an integer indicating the order in which the servlet should be
loaded. If the value is a negative integer, or the element is not pr...
Install Application programmatically on Android
I'm interested in knowing if it is possible to programmatically install a dynamically downloaded apk from a custom Android application.
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Android update activity UI from service
I have a service which is checking for new task all the time. If there is new task, I want to refresh the activity UI to show that info.
I did find https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/ this example. Is that a good approch ? Any other examples?
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in iPhone App How to detect the screen resolution of the device
...l give you the entire screen's resolution in points, so it would most typically be 320x480 for iPhones. Even though the iPhone4 has a much larger screen size iOS still gives back 320x480 instead of 640x960. This is mostly because of older applications breaking.
CGFloat screenScale = [[UIScreen main...