internals

I've just installed android studio. For the first time when I run that after a short while (after showing a loading bar), It shows me this error. So I searched in Internet and I did Everything I could,(downloading the last version on Java, re-installing the Program and run it for the first time as administrator, Adding the system variable JAVA_HOME and etc.)but still it shows me a dialog with this information: Internal error. Please report to https://code.google.com/p/android/issues java.lang.RuntimeException: java.lang.NullPointerException at com.intellij.idea.IdeaApplication.run

The ability to customize the fetch mode was removed from L5.4 and is defaulted to PDO::FETCH_OBJ. The upgrade guide states that you can override this by using an event listener: Event::listen(StatementPrepared::class, function ($event) { $event->statement->setFetchMode(...); }); I can't for the life of me understand how to implement this: 1) Where should I place the code? Should I register it with the EventServiceProvider ? 2) When does the StatementPrepared event fire? (I only need to change the Fetch Mode for specific repository functions, not on a global scale). 3) Does the FetchMode revert

(Disclaimer: I don't know what the C++ standard might say about this..I know, I'm horrible) while operating on very large strings I noticed that std::string is using copy-on-write. I managed to write the smallest loop that would reproduce the observed behaviour and the following one, for instance, runs suspiciously fast: #include <string> using std::string; int main(void) { string basestr(1024 * 1024 * 10, 'A'); for (int i = 0; i < 100; i++) { string a_copy = basestr; } } when adding a write in the loop body a_copy[1] = 'B'; , an actual copy apparently took place, and the program ran in 0.3s

Based on this answer , I learned of a special class of internal functions that can be accessed from R: a set of functions accessed via .Internal(specialFunction) . If one queries ?.Internal this excerpt may be found: Only true R wizards should even consider using this function, and only R developers can add to the list of internal functions. I want to master potions and defense against the Dark Arts for my OWLs interesting R functions. Where can R wizards find a list and description of the internal functions? So long as it doesn't involve splitting my soul. They're in src/main/names.c but they

I came across this ruby object_id allocation question sometime back and then read this awesome article which talks about VALUE and explains why object_id of true, nil and false the way they are. I have been toying with ruby2.0 object_id when I found the apparent change that has been made regarding object_id of true and nil. forbidden:~$ ruby -v ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux] forbidden:~$ forbidden:~$ irb irb(main):001:0> true.object_id => 20 irb(main):002:0> false.object_id => 0 irb(main):003:0> nil.object_id => 8 irb(main):004:0> exit forbidden:~$ forbidden:~$ rvm use

One thing that RVM can do is notice when you've changed directories, look for an .rvmrc , and change your current Ruby version and gemset according to that file's contents. It makes this change as soon as you change into that directory and outputs a message accordingly. How does it detect a change in the current working directory? I can imagine an extremely crude way of doing this: run a daemon that runs as the current user and keeps checking the results of pwd . But I'm sure that's not what it does. Another approach might be to alias cd to change directories but also check for an .rvmrc and

Perhaps somebody who implemented node.js module can explain the protocol between node.js queue processed on a single thread and a blocking IO operations that will be performed by a module. I suspect that it goes something like this: node.js thread registers a callback in a form of a closure and saves it with some correlation id. node.js invokes a method (which should perform blocking IO) on a module and passes method parameters and correlation id to it. module method spins off a thread and blocks on IO operation. when IO operation completes, modules' thread calls back to node.js thread and