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What are the applications of binary trees?
....
Treap - Randomized data structure used in wireless networking and memory allocation.
T-tree - Though most databases use some form of B-tree to store data on the drive, databases which keep all (most) their data in memory often use T-trees to do so.
The reason that binary trees are used more of...
What is the copy-and-swap idiom?
...t's a terrible thing.
In our case, the core of it is only two lines (the allocation and the copy), but with more complex resources this code bloat can be quite a hassle. We should strive to never repeat ourselves.
(One might wonder: if this much code is needed to manage one resource correctly, wh...
Clearing a string buffer/builder after loop
...
It's well known that allocation (new keyword in Java) is more expensive than just changing some fields of the same object. For "mostly", which you could replave with highly, there's more than 1.5Billion of Android Devices, all using Java.
...
How can I make setuptools install a package that's not on PyPI?
...t;/<repo>.git
Github provides the ability to create personal OAuth tokens which can be cycled
git+https://<oauth token>:x-oauth-basic@github.com/<user>/<repo>.git
requirements.txt
requirements.txt is used to specify project dependencies:
requirements.txt
package1
pack...
Get push notification while App in foreground iOS
...alert view.
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Did receive a Remote Notification" message:[NSString stringWithFormat:@"Your App name received this notification while it was running:\n%@",[[userInfo objectForKey:@"aps"] objectForKey:@"alert"]]delegat...
How to launch Safari and open URL from iOS app
...has a scheme:
NSString* text = @"www.apple.com";
NSURL* url = [[NSURL alloc] initWithString:text];
if (url.scheme.length == 0)
{
text = [@"http://" stringByAppendingString:text];
url = [[NSURL alloc] initWithString:text];
}
[[UIApplication sharedApplication] openURL:url];
...
Remove duplicate elements from array in Ruby
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If you care about memory, to_set will allocate 4 objects, while uniq allocates one.
– Jan Klimo
Jul 2 '19 at 5:48
add a comment
...
Deep copying an NSArray
...ly need a one-level-deep copy:
NSMutableArray *newArray = [[NSMutableArray alloc]
initWithArray:oldArray copyItems:YES];
The above code creates a new array whose members are shallow copies of the members of the old array.
Note that if you need to deeply copy an entire...
Named colors in matplotlib
...'#2F4F4F',
'darkturquoise': '#00CED1',
'darkviolet': '#9400D3',
'deeppink': '#FF1493',
'deepskyblue': '#00BFFF',
'dimgray': '#696969',
'dodgerblue': '#1E90FF',
'firebrick': '#B22222',
'floralwhite': '#FFFAF0',
'forestgr...
Python memory leaks [closed]
...
Tracemalloc module was integrated as a built-in module starting from Python 3.4, and appearently, it's also available for prior versions of Python as a third-party library (haven't tested it though).
This module is able to output ...