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Usages of Null / Nothing / Unit in Scala
...mple is this:
implicit def zeroNull[B >: Null] =
new Zero[B] { def apply = null }
Nothing is used in the definition of None
object None extends Option[Nothing]
This allows you to assign a None to any type of Option because Nothing 'extends' everything.
val x:Option[String] = None
...
Under what circumstances are linked lists useful?
...
I should add that the "linked lists in an array" approach in case of the Dictionary saves significantly more in .NET: otherwise each node would require a separate object on the heap - and every object allocated on the heap have some overhead. (en.csharp-online.net/Common_Ty...
UTF-8, UTF-16, and UTF-32
...nding of the encodings, I find that the Wikipedia articles are a much more approachable source.
– Adam Rosenfield
Oct 18 '13 at 16:50
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show...
How to implement a custom AlertDialog View
...
You are correct, it's because you didn't manually inflate it. It appears that you're trying to "extract" the "body" id from your Activity's layout, and that won't work.
You probably want something like this:
LayoutInflater inflater = getLayoutInflater();
FrameLayout f1 = (FrameLayout)ale...
Context switches much slower in new linux kernels
...force them on during periods of brief inactivity, which are almost always happening unless an all core consuming synthetic benchmark (e.g., stress) is running. You can monitor C state transitions, along with other useful information related to processor frequencies, using the wonderful Google i7z to...
How do I fix PyDev “Undefined variable from import” errors?
...Eclipse, do Project>Pydev>Remove error markers, and numpy should now appear in the Forced builtins.
– smci
Nov 1 '17 at 16:43
...
Submit form on pressing Enter with AngularJS
...ent) {
if(event.which === 13) {
scope.$apply(function(){
scope.$eval(attrs.ngEnter, {'event': event});
});
event.preventDefault();
}
});
};
});
HTML:
<d...
Not able to access adb in OS X through Terminal, “command not found”
...Mac system. I am able to program using Eclipse and have created few sample applications. But I am still not able to access adb through the terminal window. I have tried following command in terminal:
...
How do I obtain a Query Execution Plan in SQL Server?
...your query completes you should see an extra tab entitled "Execution plan" appear in the results pane. If you ran many statements then you may see many plans displayed in this tab.
From here you can inspect the execution plan in SQL Server Management Studio, or right click on the plan and select...
What's the difference between django OneToOneField and ForeignKey?
...shell execute the following:
OneToOneField Example
>>> from testapp.models import Car, Engine
>>> c = Car.objects.get(name='Audi')
>>> e = Engine.objects.get(name='Diesel')
>>> e.car
<Car: Audi>
ForeignKey with unique=True Example
>>> from test...