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Is multiplication and division using shift operators in C actually faster?
...difficult to do meaningfully, but we can look at a few facts. From http://www.penguin.cz/~literakl/intel/s.html#SAL and http://www.penguin.cz/~literakl/intel/i.html#IMUL we get an idea of x86 clock cycles needed for arithmetic shift and multiplication. Say we stick to "486" (the newest one list...
How to send email from Terminal?
...://hints.macworld.com/article.php?story=20081217161612647
See also:
http://www.mactricksandtips.com/2008/09/send-mail-over-your-network.html
Eg:
mail -s "hello" "example@example.com" <<EOF
hello
world
EOF
This will send an email to example@example.com with the subject hello and the message
H...
Sublime Text 2: Trim trailing white space on demand
...
I found a soulution here:
http://www.sublimetext.com/forum/viewtopic.php?f=4&t=4958
You can modify the package
trim_trailing_white_space.py
located in the default packages directory, this way:
import sublime, sublime_plugin
def trim_trailing_white...
How can I check if a URL exists via PHP?
...
Here:
$file = 'http://www.example.com/somefile.jpg';
$file_headers = @get_headers($file);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
$exists = false;
}
else {
$exists = true;
}
From here and right below the above...
nginx: [emerg] could not build the server_names_hash, you should increase server_names_hash_bucket_s
...ror when I left off a ; on the server_name line.
had:
server_name www.mydomain.com
access_log /var/log/nginx/www.mydomain.com;
fix:
server_name www.mydomain.com;
access_log /var/log/nginx/www.mydomain.com;
All directives in nginx config files must end with a ;
I ofte...
Can Git hook scripts be managed along with the repository?
...uld also work across all platforms.
If you need any more info see https://www.viget.com/articles/two-ways-to-share-git-hooks-with-your-team/
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Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...ebug:
http://railscasts.com/episodes/54-debugging-with-ruby-debug
http://www.sitepoint.com/article/debug-rails-app-ruby-debug/
http://www.datanoise.com/articles/2006/7/12/tutorial-on-ruby-debug
It's incredibly helpful!
s...
Windbg Step 2 分析程序堆栈实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Windbg Step 2 分析程序堆栈实战转载+整理http: www.cnblogs.com killmyday#include"stdafx.h"#include<tchar.h>#ifdef_UNICODE#define_ttol_wtol#else#define_ttolatol#e...转载+整理 http://www.cnblogs.com/killmyday
#include "stdafx.h"
#include <tchar.h>
#ifdef _UNICODE
#define _tt...
What does “xmlns” in XML mean?
...n an XML instance document.
Check out this tutorial on namespaces: http://www.sitepoint.com/xml-namespaces-explained/
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How can I handle the warning of file_get_contents() function in PHP?
...severity, $severity, $file, $line);
}
);
try {
file_get_contents('www.google.com');
}
catch (Exception $e) {
echo $e->getMessage();
}
restore_error_handler();
Seems like a lot of code to catch one little error, but if you're using exceptions throughout your app, you would only nee...