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Java Class.cast() vs. cast operator
...avoid warnings in "generics land". I often see methods doing things like this:
@SuppressWarnings("unchecked")
<T> T doSomething() {
Object o;
// snip
return (T) o;
}
It's often best to replace it by:
<T> T doSomething(Class<T> cls) {
Object o;
// snip
re...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
... multi-dimensional arrays, the current best option in Haskell, in my view, is repa.
Repa provides high performance, regular, multi-dimensional, shape polymorphic parallel arrays. All numeric data is stored unboxed. Functions written with the Repa combinators are automatically parallel provided y...
Determine if running on a rooted device
... certain piece of functionality that will only work on a device where root is available. Rather than having this feature fail when it is used (and then show an appropriate error message to the user), I'd prefer an ability to silently check if root is available first, and if not,hide the respective o...
Excel “External table is not in the expected format.”
... an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our network. H...
Difference between the 'controller', 'link' and 'compile' functions when defining a directive
...ular homepage uses controller for one and link for another directive. What is the difference between the two?
4 Answers
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Is this the right way to clean-up Fragment back stack when leaving a deeply nested stack?
...
Well there are a few ways to go about this depending on the intended behavior, but this link should give you all the best solutions and not surprisingly is from Dianne Hackborn
http://groups.google.com/group/android-developers/browse_thread/thread/d2a5c203dad6ec42...
Why doesn't requests.get() return? What is the default timeout that requests.get() uses?
...
What is the default timeout that get uses?
The default timeout is None, which means it'll wait (hang) until the connection is closed.
What happens when you pass in a timeout value?
r = requests.get(
'http://www.justdial.co...
Why does integer overflow on x86 with GCC cause an infinite loop?
...f happens".
Yes, on x86 CPUs, integers usually wrap the way you expect. This is one of those exceptions. The compiler assumes you won't cause undefined behavior, and optimizes away the loop test. If you really want wraparound, pass -fwrapv to g++ or gcc when compiling; this gives you well-defined (...
Time complexity of Sieve of Eratosthenes algorithm
...
Your n/2 + n/3 + n/5 + … n/97 is not O(n), because the number of terms is not constant. [Edit after your edit: O(n2) is too loose an upper bound.] A loose upper-bound is n(1+1/2+1/3+1/4+1/5+1/6+…1/n) (sum of reciprocals of all numbers up to n), which is...
What's the valid way to include an image with no src?
...te with a src later with javascript but for ease I want the image tag to exist at pageload but just not display anything. I know <img src='' /> is invalid so what's the best way to do this?
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