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Is volatile expensive?
...LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are effectively no-ops on X86 CPUs. Does this mean that volatile read operations can be done without a explicit cache invalidation on x86, and is as fast as a normal variable read (disregarding the reordering co...
Ruby: How to get the first character of a string
...= "Smith"
first_name = "John"
Then you can get the initials very cleanly and readably:
puts first_name.initial # prints J
puts last_name.initial # prints S
The other method mentioned here doesn't work on Ruby 1.8 (not that you should be using 1.8 anymore anyway!--but when this answer was p...
In Git, how can I write the current commit hash to a file in the same commit
...-parse HEAD > filename or perhaps git describe [--tags] > filename), and it avoids doing anything crazy like ending up with a file that's different from what git's tracking.
Your code can then reference this file when it needs the version number, or a build process could incorporate the infor...
Null or default comparison of generic argument in C#
...is respects IEquatable<T> (without boxing) as well as object.Equals, and handles all the Nullable<T> "lifted" nuances. Hence:
if(EqualityComparer<T>.Default.Equals(obj, default(T))) {
return obj;
}
This will match:
null for classes
null (empty) for Nullable<T>
zero/f...
Invoking JavaScript code in an iframe from the parent page
Basically, I have an iframe embedded in a page and the iframe has some JavaScript routines I need to invoke from the parent page.
...
SecurityException: Permission denied (missing INTERNET permission?)
this error is really really really strange and I don't know how to reproduce it and how to fix it because I made a lot of searches but nothing was useful.
...
Best PHP IDE for Mac? (Preferably free!) [closed]
.... Be prepared to allow half a gig of memory then you'll need to shut down and restart.
Komodo
A step above a Text Editor. Does not support database connections or split views. Color coding and syntax checking are there to an extent. The project control on Komodo is very unwieldy and strange compar...
Retrieve only static fields declared in Java class
...
I stumbled across this question by accident and felt it needed a Java 8 update using streams:
public static List<Field> getStatics(Class<?> clazz) {
List<Field> result;
result = Arrays.stream(clazz.getDeclaredFields())
// filter ...
Which C++ idioms are deprecated in C++11?
With the new standard, there are new ways of doing things, and many are nicer than the old ways, but the old way is still fine. It's also clear that the new standard doesn't officially deprecate very much, for backward compatibility reasons. So the question that remains is:
...
Google Play Services Library update and missing symbol @integer/google_play_services_version
...eased on Halloween 2013 ), you are now supposed to add a new tag into the AndroidManifest.xml file.
26 Answers
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