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How does a language expand itself? [closed]
...nner core of pure hardware to the outermost application layer. Each layer exposes parts of itself to the next outer layer, so that the outer layer may use some of the inner layers functionality.
In the case of e.g. Windows the operating system exposes the so-called WIN32 API for applications runnin...
Is “else if” a single keyword?
...tement containing the original substatement.
and provides the following example:
if (x)
int i;
can be equivalently rewritten as
if (x) {
int i;
}
So how is your slightly extended example parsed?
if
statement_0;
else
if
statement_1;
else
if
statement_2 ;
will be p...
Where does Visual Studio look for C++ header files?
...ssor in VS 2010 looks into the current dir only if the quoted include syntax is used (e.g #include "whatever.h"). Using angle brackets (e.g #include <whatever.h>) omits the current dir ( msdn.microsoft.com/en-us/library/36k2cdd4(v=VS.100).aspx )
– Dennis Münkle
...
Why is it common to put CSRF prevention tokens in cookies?
...hout the application in client script for use in both regular forms and AJAX POSTs. This will make sense in a JavaScript heavy application such as one employed by AngularJS (using AngularJS doesn't require that the application will be a single page app, so it would be useful where state needs to flo...
#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular s
...hy:
First, you can use DEBUG_ENABLED in preprocessor and compiled tests. Example - Often, I want longer timeouts when debug is enabled, so using #if, I can write this
DoSomethingSlowWithTimeout(DEBUG_ENABLED? 5000 : 1000);
... instead of ...
#ifdef DEBUG_MODE
DoSomethingSlowWithTimeout(5000...
When to use ' (or quote) in Lisp?
...
Short answer
Bypass the default evaluation rules and do not evaluate the expression (symbol or s-exp), passing it along to the function exactly as typed.
Long Answer: The Default Evaluation Rule
When a regular (I'll come to that later) function is invoked, all arguments passed to it are evaluated...
Asynchronous method call in Python?
...rgs[, kwds[, callback]]])
E.g.:
from multiprocessing import Pool
def f(x):
return x*x
if __name__ == '__main__':
pool = Pool(processes=1) # Start a worker processes.
result = pool.apply_async(f, [10], callback) # Evaluate "f(10)" asynchronously calling callback when fin...
Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?
I am trying to support CORS in my Node.js application that uses the Express.js web framework. I have read a Google group discussion about how to handle this, and read a few articles about how CORS works. First, I did this (code is written in CoffeeScript syntax):
...
Undefined reference to static class member
Can anyone explain why following code won't compile? At least on g++ 4.2.4.
7 Answers
...
Javascript and regex: split string and keep the separator
...
Use (positive) lookahead so that the regular expression asserts that the special character exists, but does not actually match it:
string.split(/<br \/>(?=&#?[a-zA-Z0-9]+;)/g);
See it in action:
var string = "aaaaaa<br />&dagger; bbbb<br /&...