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wildcard * in CSS for classes
...I'm styling with .tocolor , but I also need the unique identifier 1,2,3,4 etc. so I'm adding that it as another class tocolor-1 .
...
Dynamic variable names in Bash
..." # outputs “lolilol”
echo "${!name%lol}" # outputs “loli”
# etc.
Unfortunately, there is no counterpart syntax for modifying the aliased variable. Instead, you can achieve assignment with one of the following tricks.
1a. Assigning with eval
eval is evil, but is also the simplest and ...
What are the differences between Helper and Utility classes?
...becoming useless. Examples: Vector3, RandomNumberGenerator, StringMatcher, etc...
A "helper" seems to be any class whose design is to aid another class. These may or may not depend on your project. If you're creating a GameNetworkClient class, you could say the GameNetworkConnection class is a 'he...
Advantages of std::for_each over for loop
... your mind to the rest of the STL-algorithms, like find_if, sort, replace, etc and these won't look so strange anymore. This can be a huge win.
Update 1:
Most importantly, it helps you go beyond for_each vs. for-loops like that's all there is, and look at the other STL-alogs, like find / sort / pa...
MySQL: Large VARCHAR vs. TEXT?
... If all the columns are short and predictable (ex: MAC address, IMEI, etc... are things that never change) then use CHAR columns and you can make your row size fixed, which should speed things up considerably if using MyISAM, possibly also InnoDb although I am not sure about it.
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Conventions for exceptions or error codes
...tion can then contain code to check whether the file exists, or is locked, etc)
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How to initialize log4j properly?
...sed to initialize itself, which loggers / appenders got configured and how etc.
The configuration file can be a java properties file or an xml file. Here is a sample of the properties file format taken from the log4j intro documentation page:
log4j.rootLogger=debug, stdout, R
log4j.appender.stdo...
Image comparison - fast algorithm
... if a good match is found at the faster level.
file-hash based (md5,sha1,etc) for exact duplicates
perceptual hashing (phash) for rescaled images
feature-based (SIFT) for modified images
I am having very good results with phash. The accuracy is good for rescaled images. It is not good ...
C/C++ Struct vs Class
...no other class-like features: no methods, no constructor, no base classes, etc. Although C++ inherited the keyword, it extended the semantics. (This, however, is why things default to public in structs—a struct written like a C struct behaves like one.)
While it's possible to fake some OOP in C...
Redis - Connect to Remote Server
...did not help me (albeit well written).
The solution is here : check your /etc/redis/redis.conf, and make sure to change the default
bind 127.0.0.1
to
bind 0.0.0.0
Then restart your service (service redis-server restart)
You can then now check that redis is listening on non-local interface wi...