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Can we instantiate an abstract class?
...that here: -
Whenever a new class instance is created, memory space is allocated
for it with room for all the instance variables declared in the class
type and all the instance variables declared in each superclass of the
class type, including all the instance variables that may be hidden....
WKWebView not loading local files under iOS 8
...athComponent;
... then start it up like so:
_webServer = [[GCDWebServer alloc] init];
[_webServer addGETHandlerForBasePath:@"/" directoryPath:docRoot indexFilename:@"index.html" cacheAge:3600 allowRangeRequests:YES];
[_webServer startWithPort:port bonjourName:nil];
To stop it:
[_webServer stop...
Batch script: how to check for admin rights
...put, you need to do the following: setlocal enabledelayedexpansion for /f "tokens=* delims=" %%s in ('sfc 2^>^&1^|MORE') do @set "output=!output!%%s" echo "%output%"|findstr /I /C:"/scannow">nul 2>&1 (3 separate lines). This should work on Windows 2000 through Windows 2012 R2. On a ...
When do I need to use Begin / End Blocks and the Go keyword in SQL Server?
... the following lines. It doesn't "see" the symbol until it encounters a GO token which tells it to execute the preceding SQL since the last GO, at which point the symbol is applied to the database and becomes visible to the parser.
Why it doesn't just treat the semi-colon as a semantic break and ap...
Location Services not working in iOS 8
...
- (void)startLocationManager
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; //whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdat...
Why is try {…} finally {…} good; try {…} catch{} bad?
...atement. If you are only using a 'try' in order to ensure resources are de-allocated in the 'finally' block, you might consider the 'using' statement instead:
using (StreamReader reader = new StreamReader('myfile.txt'))
{
// do stuff here
} // reader.dispose() is called automatically
You can ...
What are the differences between vector and list data types in R?
...
As someone who's just gotten into R, but comes from a C/Java/Ruby/PHP/Python background, here's how I think of it.
A list is really an array + a hashmap. It's a PHP associative array.
> foo = list(bar='baz')
> foo[1]
'baz'
> foo$bar
'baz'
> foo[['bar']]
'baz'
A vector is a f...
Why is string concatenation faster than array join?
...y overhead.
On the other hand ['abc', 'def'].join('') would usually just allocate memory to lay out the new string flat in memory. (Maybe this should be optimized)
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How to quit android application programmatically
...nishAffinity(); without System.exit(0); your application will quit but the allocated memory will still be in use by your phone, so... if you want a clean and really quit of an app, use both of them.
This is the simplest method and works anywhere, quit the app for real, you can have a lot of activit...
Picking a random element from a set
...w array? docs.oracle.com/javase/7/docs/api/java/util/… "this method must allocate a new array even if this collection is backed by an array"
– anton1980
Nov 22 '14 at 3:19
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