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How to implement a rule engine?
...ad of 'greater_than' etc. - this is because 'GreaterThan' is the .NET name for the operator, therefore we don't need any extra mapping.
If you need custom names you can build a very simple dictionary and just translate all operators before compiling the rules:
var nameMap = new Dictionary<string,...
How to determine whether code is running in DEBUG / RELEASE build?
...s build settings under 'Apple LLVM - Preprocessing', 'Preprocessor Macros' for debug to ensure that DEBUG is being set - do this by selecting the project and clicking on the build settings tab. Search for DEBUG and look to see if indeed DEBUG is being set.
Pay attention though. You may see DEBUG c...
Portable way to get file size (in bytes) in shell?
On Linux, I use stat --format="%s" FILE , but Solaris I have access to doesn't have stat command. What should I use then?
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Ruby: require vs require_relative - best practice to workaround running in both Ruby =1.
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A workaround for this was just added to the 'aws' gem so thought I'd share as it was inspired by this post.
https://github.com/appoxy/aws/blob/master/lib/awsbase/require_relative.rb
unless Kernel.respond_to?(:require_relative)
module...
ImportError: numpy.core.multiarray failed to import
...
Was in the exact same condition... For me the issue was dual installation of numpy which was in a conflicting version with other libraries and it was shadowing the correct numpy version installed by conda. Solution: pip uninstall numpy ... this removed the f...
Linux - Replacing spaces in the file names
...
This should do it:
for file in *; do mv "$file" `echo $file | tr ' ' '_'` ; done
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How can we match a^n b^n with Java regex?
...nly write a Java regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are given as the solution is slowly cons...
Concatenating two one-dimensional NumPy arrays
...e able to concatenate them using numpy.concatenate . But I get this error for the code below:
6 Answers
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关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...塞的古老模型：属于同步阻塞 IO 模型，代码如下：
socket_server.php
<?php
/**
* SocketServer Class
* By James.Huang <shagoo#gmail.com>
**/
set_time_limit(0);
class SocketServer
{
private stati...
What does the PHP error message “Notice: Use of undefined constant” mean?
...age = mysql_real_escape_string($_POST['message']);
As is, it was looking for constants called department, name, email, message, etc. When it doesn't find such a constant, PHP (bizarrely) interprets it as a string ('department', etc). Obviously, this can easily break if you do defined such a cons...