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Clojure differences between Ref, Var, Agent, Atom, with examples
...duce a short snip-it of the motivations for each:
start by watching this video on the notion of Identity and/or studying here.
Refs are for Coordinated Synchronous access to "Many Identities".
Atoms are for Uncoordinated synchronous access to a single Identity.
Agents are for Uncoordinated asynch...
How can I access “static” class variables within class methods in Python?
...
@Constantin -- I didn't realize that, it's an interesting distinction. Thanks for the correction :-)
– bedwyr
Apr 3 '09 at 1:14
...
Golang tests in sub-directory
... exported content.
you wouldn't access non-exported content.
That being said, I would still prefer keep the _test.go file right beside the main source file: it is easier to find.
share
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improve th...
Is there a Java equivalent to C#'s 'yield' keyword?
...ore portable (for example, I don't think Aviad's library will work on Android).
Interface
Aviad's library has a cleaner interface - here's an example:
Iterable<Integer> it = new Yielder<Integer>() {
@Override protected void yieldNextCore() {
for (int i = 0; i < 10; i++)...
Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll
... private SampleClass sampleClass;
@BeforeClass
public static void beforeClassFunction(){
System.out.println("Before Class");
}
@Before
public void beforeFunction(){
sampleClass=new SampleClass();
System.out.println("Before Function");
}
@Afte...
Why is a 3-way merge advantageous over a 2-way merge?
...
"But how would it know what to do with the differences?" Didn't get it. If it can already see the differences between the two files (without reference to the original), why can't it apply both changes serially in increasing order of files' timestamps? That is: It starts off with my ...
Why are my JavaScript function names clashing?
..."Me original.");
}
f();
Which explains what you're getting, you're overriding the function. More generally, multiple var declarations are allowed in JavaScript - var x = 3; var x = 5 is perfectly legal. In the new ECMAScript 6 standard, let statements forbid this.
This article by @kangax does a ...
Which, if any, C++ compilers do tail-recursion optimization?
...x.
For GCC, Clang and ICC, use -O3
An easy way to check if the compiler did the optimisation is to perform a call that would otherwise result in a stack overflow — or looking at the assembly output.
As an interesting historical note, tail call optimisation for C was added to the GCC in the cour...
Heroku/devise - Missing host to link to! Please provide :host parameter or set default_url_options[:
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Hi sam! I am sorry but i didn't get it. I just add the line config.action_mailer.default_url_options = { :host => 'localhost' } in my env.rb but my rails 3 app crashes on heroku. Did I have to put something on the env/prod.rb too? (sorry my english...
Exclude a sub-directory using find
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Thank you for this code snippet, which might provide some limited short-term help. A proper explanation would greatly improve its long-term value by showing why this is a good solution to the problem, and would make it more useful to future readers with other, similar quest...