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How do I get the full path to a Perl script that is executing?
...ch environments, I use __FILE__ and get the path from that using the File::Basename module:
use File::Basename;
my $dirname = dirname(__FILE__);
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How to safely open/close files in python 2.4
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Determine what attributes were changed in Rails after_save callback?
... 5.1+
Use saved_change_to_published?:
class SomeModel < ActiveRecord::Base
after_update :send_notification_after_change
def send_notification_after_change
Notification.send(…) if (saved_change_to_published? && self.published == true)
end
end
Or if you prefer, saved_chang...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...码一一比对进行阅读。而且，最好也把连接选项的Dynamic Base (ASLR)禁用。编译器 解析 Try Catch Throw
Explicitly calling return in a function or not
... version 2.15
The picture above may slightly difffer on your platform.
Based on measured data, the size of returned object is not causing any difference, the number of repeats (even if scaled up) makes just a very small difference, which in real word with real data and real algorithm could not b...
Is “else if” a single keyword?
...tandard? In ASM its: jeq (if | else if), jne (if | else if), jmp (else). Based on that, I'd have said it was a single keyword.. probably not syntactically but instruction-wise.
– Brandon
Jun 23 '14 at 23:02
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urlencode vs rawurlencode?
... it is.
RAWURLENCODE:
Allocates memory for the string
Iterates over it based on length provided in function call (not calculated in function as with URLENCODE).
Note: Many programmers have probably never seen a for loop iterate this way, it's somewhat hackish and not the standard convention us...
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar
I'm trying to implement search code in my CoreData-based iPhone app. I'm not sure how to proceed. The app already has an NSFetchedResultsController with a predicate to retrieve the data for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confus...
Loop through files in a directory using PowerShell
...file
$content | Where-Object {$_ -match 'step[49]'} | Set-Content ($_.BaseName + '_out.log')
}
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Regex Email validation
... here: C# – Email Regular Expression
Also, this checks for RFC validity based on email syntax, not for whether the email really exists. The only way to test that an email really exists is to send and email and have the user verify they received the email by clicking a link or entering a token.
T...