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What does the exclamation mark mean in a Haskell declaration?
...n evaluated, will return a "thunk": that is, the code to execute to figure out its value. At that point, a Foo doesn't even exist yet, just the code.
But at some point someone may try to look inside it, probably through a pattern match:
case f of
Foo 0 _ _ _ -> "first arg is zero"
_ ...
How can you integrate a custom file browser/uploader with CKEditor?
...in PHP, that goes to $_FILES['upload']. What CKEditor wants your server to output is a complete JavaScript block:
$output = '<html><body><script type="text/javascript">window.parent.CKEDITOR.tools.callFunction('.$callback.', "'.$url.'","'.$msg.'");</script></body></...
List vs List
... This doesn't explain what the difference is between with or without ? extends. Nor does it explain the correlation with super/subtypes or co/contravariance (if there is any).
– Abel
Mar 28 '12 at 7:14
...
How to save/restore serializable object to/from file?
...f (string.IsNullOrEmpty(fileName)) { return default(T); }
T objectOut = default(T);
try
{
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(fileName);
string xmlString = xmlDocument.OuterXml;
using (StringReader r...
How to properly add cross-site request forgery (CSRF) token using PHP
...y
md5() doesn't add entropy, it just mixes it deterministically
Try this out:
Generating a CSRF Token
PHP 7
session_start();
if (empty($_SESSION['token'])) {
$_SESSION['token'] = bin2hex(random_bytes(32));
}
$token = $_SESSION['token'];
Sidenote: One of my employer's open source projects ...
Create a pointer to two-dimensional array
...[1] = ...; // also possible now
It has the benefit that it preserves the outer dimension's size. So you can apply sizeof on it
sizeof (*matrix_ptr) == sizeof(uint8_t) * 10 * 20
There is one other answer that makes use of the fact that items in an array are contiguously stored
uint8_t *matrix...
What is the difference between char s[] and char *s?
...
I'd like to point out that char s = "xx" doesn't have to be in read-only memory (some implementations have no MMUs, for example). The n1362 c1x draft simply states that modifying such an array causes undefined behavior. But +1 anyway, since re...
A fast method to round a double to a 32-bit int explained
... the fact that the mantissa is 52 bits wide.
The other interesting fact about adding 251+252 is that it affects the mantissa only in the two highest bits - which are discarded anyway, since we are taking only its lowest 32 bits.
Last but not least: the sign.
IEEE 754 floating point uses a magni...
Fast Linux File Count for a large number of files
I'm trying to figure out the best way to find the number of files in a particular directory when there are a very large number of files ( > 100,000).
...
When should I use mmap for file access?
... file into memory. If the operating system has to swap part of A's memory out, it must write the contents of the buffer to swap before it can reuse the memory. In B's case any unmodified mmap'd pages can be reused immediately because the OS knows how to restore them from the existing file they wer...