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How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...r the first case, go for a hash. It is simpler and cleaner code. Easier to test and maintain. For a more ellaborated use case where prefixes or sufixes matter, go for a trie.
And if you do it just for fun, implementing a trie would put a Sunday afternoon to a good use.
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datatrigger on enum to change image
... I added the xmlns like this: xmlns:local="clr-namespace:MyCompany.Testbench" and the trigger like that <DataTrigger Binding="{Binding Path=LapCounterPingStatus}" Value="{x:Static local:PingStatus.PING_UNKNOWN}">. No I get the error Cannot find the type 'PingStatus'.
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Simple and fast method to compare images for similarity
...u can be sure to have precise alignment of your template (the icon) to the testing region, then any old sum of pixel differences will work.
If the alignment is only going to be a tiny bit off, then you can low-pass both images with cv::GaussianBlur before finding the sum of pixel differences.
If ...
Flask-SQLAlchemy how to delete all rows in a single table
...User.query.delete() as query object as 'BaseQuery' object is not callable. Tested and verified.
– Shirish Kadam
Jul 13 '19 at 23:29
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Simple C example of doing an HTTP POST and consuming the response
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Handle added.
Added Host header.
Added linux / windows support, tested (XP,WIN7).
WARNING: ERROR : "segmentation fault" if no host,path or port as argument.
#include <stdio.h> /* printf, sprintf */
#include <stdlib.h> /* exit, atoi, malloc, free */
#include <unistd.h> /...
What is a domain specific language? Anybody using it? And in what way?
...ose language but it can be used to write DSLs. docs.groovy-lang.org/docs/latest/html/documentation/…
– Charlie Martin
Jul 27 '15 at 13:10
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Backwards migration with Django South
...he bare "state" number - in this case 00xx - is enough. When improving and testing a migration you can have both commands in the history: forward (no argument), backward with previous state number.
– Tomasz Gandor
Feb 1 '13 at 9:14
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How can I reverse a NSArray in Objective-C?
...nal array is not mutated. Apple documents that immutability should not be tested for at run time, but be assumed based on the returned type, so returning an NSMutableArray in this case is perfectly correct code.
– Peter N Lewis
Feb 26 '15 at 0:06
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Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar
...I personally needed this for a dynamic navbar rather than a toolbar, but I tested it with a toolbar and the code is nearly the same:
// create button
UIButton* backButton = [UIButton buttonWithType:101]; // left-pointing shape!
[backButton addTarget:self action:@selector(backAction) forControlEvent...
Why is a boolean 1 byte and not 1 bit of size?
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I think bt addresses a byte offset and then tests the bit at a given offset, regardless, when specifying an address you go in bytes...bit offset literals would get a bit wordy (excuse the pun).
– user7116
Jan 7 '11 at 16:12
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