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How do malloc() and free() work?
...found that is bigger than the needed memory, it is divided into two parts. One is returned to caller, the other is put back into the free list.
There are many different optimizations to this standard behaviour (for example for small chunks of memory). But since malloc and free must be so universal,...
Compare double to zero using epsilon
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Assuming 64-bit IEEE double, there is a 52-bit mantissa and 11-bit exponent. Let's break it to bits:
1.0000 00000000 00000000 00000000 00000000 00000000 00000000 × 2^0 = 1
The smallest representable number greater than 1:
1.0000 00000000 00000000 00000000 00000000 00000000 00000001 × 2^0 ...
Decimal number regular expression, where digit after decimal is optional
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/\d+\.?\d*/
One or more digits (\d+), optional period (\.?), zero or more digits (\d*).
Depending on your usage or regex engine you may need to add start/end line anchors:
/^\d+\.?\d*$/
Debuggex Demo
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Is there a way to loop through a table variable in TSQL without using a cursor?
...ch every single row in the table, the EXISTS only needs to touch the first one (see Josef's answer below).
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favicon.png vs favicon.ico - why should I use PNG instead of ICO?
...nel ICOs as well, such as the Dynamic Drive tool and Photoshop plugin mentioned by @mercator.
Feel free to consult the other answers here for more details.
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Sort array by firstname (alphabetically) in Javascript
I got an array (see below for one object in the array) that I need to sort by firstname using JavaScript.
How can I do it?
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Why does NULL = NULL evaluate to false in SQL server
...hould be treated as x = y, where x and y are unbound variables. Now if someone asks you, what is the value of x = y? The only reasonable answer is, "some z". So we have (x = y) = z - or, transcribing it back to SQL, (NULL = NULL) = NULL.
– Pavel Minaev
Dec 4 '0...
How can I selectively merge or pick changes from another branch in Git?
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You use the cherry-pick command to get individual commits from one branch.
If the change(s) you want are not in individual commits, then use the method shown here to split the commit into individual commits. Roughly speaking, you use git rebase -i to get the original commit to edit, the...
Access Container View Controller from Parent iOS
...ributes inspector in Storyboard. Then have the parent view controller (the one housing the container view) implement a method like this:
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSString * segueName = segue.identifier;
if ([segueName isEqualToString: @"alertview...
@property retain, assign, copy, nonatomic in Objective-C
As someone that's new to Objective-C can someone give me an overview of the retain, assign, copy and any others I'm missing, that follow the @property directive? What are they doing and why would I want to use one over another?
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