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How do you cast a List of supertypes to a List of subtypes?
...termediate wildcard type and it will be allowed (since you can cast to and from wildcard types, just with an unchecked warning):
List<TestB> variable = (List<TestB>)(List<?>) collectionOfListA;
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Java: Detect duplicates in ArrayList?
...of detecting the elements in a 2D array be the same? For example, checking from array[0][0] to array[0][6] (a 'row')..? Many thanks, Terry
– Terry
Feb 18 '09 at 21:29
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How to delete and replace last line in the terminal using bash?
...e return with \r
seq 1 1000000 | while read i; do echo -en "\r$i"; done
from man echo:
-n do not output the trailing newline
-e enable interpretation of backslash escapes
\r carriage return
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Is APC compatible with PHP 5.4 or PHP 5.5?
...with the current SVN releases, there is still the odd report of edge cases from people under certain configurations, or under heavy load.
As with everything you would want to use in a production environment, make sure you thoroughly test any release (beta or stable) in development or pre-production ...
How to dismiss keyboard iOS programmatically when pressing return
...Application.sharedApplication().sendAction("resignFirstResponder", to:nil, from:nil, forEvent:nil)
Swift 3
UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
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Is there documentation for the Rails column types?
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Guidelines built from personal experience:
String:
Limited to 255 characters (depending on DBMS)
Use for short text fields (names, emails, etc)
Text:
Unlimited length (depending on DBMS)
Use for comments, blog posts, etc. General rule ...
Make sure only a single instance of a program is running
...tform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version is available singleton.py. Please file bugs here.
You can install tend using one of the f...
Looping in a spiral
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C++ anyone? Quick translation from python, posted for completeness
void Spiral( int X, int Y){
int x,y,dx,dy;
x = y = dx =0;
dy = -1;
int t = std::max(X,Y);
int maxI = t*t;
for(int i =0; i < maxI; i++){
if ((-X/2 <= ...
How does inline Javascript (in HTML) work?
... use the variable event to retrieve the event (and the originating element from it via event.target), from my inline JS snippet! Cool.
– Steven Lu
May 15 '12 at 20:03
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Catch an exception thrown by an async void method
Using the async CTP from Microsoft for .NET,
is it possible to catch an exception thrown by an async method in the calling method?
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