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Mapping two integers to one, in a unique and deterministic way
...d for e.g. dovetailing. Have a look at this PDF for an introduction to so-called pairing functions. Wikipedia introduces a specific pairing function, namely the Cantor pairing function:
Three remarks:
As others have made clear, if you plan to implement a pairing function, you may soon find you ...
Convert List to List
...iterate over the list and cast the elements. This can be done using ConvertAll:
List<A> listOfA = new List<C>().ConvertAll(x => (A)x);
You could also use Linq:
List<A> listOfA = new List<C>().Cast<A>().ToList();
...
How to add Action Bar from support library into PreferenceActivity?
...ected void onCreate(Bundle savedInstanceState) {
getDelegate().installViewFactory();
getDelegate().onCreate(savedInstanceState);
super.onCreate(savedInstanceState);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(sa...
Why is Thread.Sleep so harmful
...
The problems with calling Thread.Sleep are explained quite succinctly here:
Thread.Sleep has its use: simulating lengthy operations while testing/debugging on an MTA thread. In .NET there's no other reason to use it.
Thread.Sleep(n) m...
Serving gzipped CSS and JavaScript from Amazon CloudFront via S3
... a backup if they can't.
Then do something similar in the footer assuming all of your js is in one file and can go in the footer.
<div id="sr_js"></div>
<script type="text/javascript">
(function () {
var sr_js_file = 'http://d2ft4b0ve1aur1.cloudfront.net/js-050/sr-br-min.js...
How can I read and parse CSV files in C++?
I need to load and use CSV file data in C++. At this point it can really just be a comma-delimited parser (ie don't worry about escaping new lines and commas). The main need is a line-by-line parser that will return a vector for the next line each time the method is called.
...
Position Relative vs Absolute?
... regardless of what content passes through, under or over the element (visually).
The four positioning properties are:
top
right
bottom
left
To use them, you need to think of them as offset properties. In other words, an element positioned right: 2px is not moved right 2px. It's right side is o...
How to make Java honor the DNS Caching Timeout?
...rkaddress.cache.negative.ttl as System Properties by using the -D flag or calling System.setProperty because these are not System properties - they are Security properties.
If you want to use a System property to trigger this behavior (so you can use the -D flag or call System.setProperty), you wil...
How does Hadoop process records split across block boundaries?
...mapper already knows if it neds to discard the first line or not.
So basically if you have 2 lines of each 100Mb in the same file, and to simplify let's say the split size is 64Mb. Then when the input splits are calculated, we will have the following scenario:
Split 1 containing the path and the ...
For i = 0, why is (i += i++) equal to 0?
...d
i + 1; // Note that you are discarding the calculation result
What actually happens is more involved than that - take a look at MSDN, 7.5.9 Postfix increment and decrement operators:
The run-time processing of a postfix increment or decrement operation of the form x++ or x-- consists of the ...