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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.
...
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 ...
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 .
...
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...
What is the difference between the kernel space and the user space?
...r processes have to use the predefined system calls i.e. open, read, write etc. Also, the C library functions like printf call the system call write in turn.
The system calls act as an interface between the user processes and the kernel processes. The access rights are placed on the kernel space i...
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...
git produces Gtk-WARNING: cannot open display
...d that it was this script setting this variable on my CentOS 6.7 system: /etc/profile.d/gnome-ssh-askpass.sh
– hshib
Mar 25 '16 at 21:15
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