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Function pointers, Closures, and Lambda
I am just now learning about function pointers and, as I was reading the K&R chapter on the subject, the first thing that hit me was, "Hey, this is kinda like a closure." I knew this assumption is fundamentally wrong somehow and after a search online I didn't find really any analysis of this compari...
Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...ferenceManager.setDefaultValues(this, R.xml.preference, false);
It will load your preferences from XML, and last parameter (readAgain) will guarantee that user preferences won't be overwritten. That means setting the readAgain argument to false means this will only set the default values if this me...
What's the difference between @Component, @Repository & @Service annotations in Spring?
... but, by annotating them with @Repository, @Service, or @Controller
instead, your classes are more properly suited for processing by tools
or associating with aspects.
For example, these stereotype annotations
make ideal targets for pointcuts. @Repository, @Service, and
@Controller can...
How to work around the lack of transactions in MongoDB?
...es to MongoDB that enable transactions do not impact performance for workloads that do not require them.
For more details see here.
Having distributed transactions, doesn't mean that you should model your data like in tabular relational databases. Embrace the power of the document model and follo...
window.close and self.close do not close the window in Chrome
...he best way to deal with this is to make a Chrome extension and/or Firefox add-on instead. These can reliably close the current window.
However, since the security risks, posed by window.close, are much less for a Greasemonkey/Tampermonkey script; Greasemonkey and Tampermonkey could reasonably pro...
C# Thread safe fast(est) counter
What is the way to obtain a thread safe counter in C# with best possible performance?
5 Answers
...
Execute AsyncTask several times
...
AsyncTask instances can only be used one time.
Instead, just call your task like new MyAsyncTask().execute("");
From the AsyncTask API docs:
Threading rules
There are a few threading rules that must be followed for this class to work properly:
The task instance must be create...
How to find the lowest common ancestor of two nodes in any binary tree?
...on, resulting in (steps not shown): {1, 2}
Now compare the two lists you made looking for the first element where the list differ, or the last element of one of the lists, whichever comes first.
This algorithm requires O(h) time where h is the height of the tree. In the worst case O(h) is equivale...
Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
...al representation before optimizing or executing the query, so the human-readable syntax makes no difference.
I also try to evangelize the SQL-92 syntax. Sixteen years after it was approved, it's about time people start using it! And all brands of SQL database now support it, so there's no reason...
Path of assets in CSS files in Symfony 2
...it point the image in /web/bundles/mynicebundle/images/devil.png
I have made a test with ALL possible (sane) combinations of the following:
@notation, relative notation
Parse with cssrewrite, without it
CSS image background vs direct <img> tag src= to the very same image than CSS
CSS parse...