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How to sum up elements of a C++ vector?
...easurably faster on current Intel x86 CPUs. Also, counting a loop-counter down to zero can save the compiler an instruction in the asm, which can be significant if it doesn't unroll the loop. Prefetching sometimes works slightly better when looping forwards, though, so in general it's not better t...
Java 256-bit AES Password-Based Encryption
...olicy (else you'll encounter InvalidKeyException: Illegal Key Size). It's downloadable for Java 6, Java 7 and Java 8.
Example usage
import org.springframework.security.crypto.encrypt.Encryptors;
import org.springframework.security.crypto.encrypt.TextEncryptor;
import org.springframework.security.cr...
live output from subprocess command
...rent process, your Python program simply needs to use write() to send data down the pipe. You can do this yourself, e.g.:
proc = subprocess.Popen(cmd, stdin=subprocess.PIPE)
proc.stdin.write('here, have some data\n') # etc
or you can pass the stdin data to proc.communicate(), which then does the...
Is there a practical use for weak references? [duplicate]
...t the garbage collector needs to reclaim space, it can do so safely.
The downside is of course that the cleanup policy of the garbage collector is tuned to meet the goals of the whole system, not your specific cache problem. If the GC policy and your desired cache policy are sufficiently aligned t...
How to solve Permission denied (publickey) error when using Git?
...hould be good to clone and checkout.
Further information can be found at https://help.github.com/articles/generating-ssh-keys (thanks to @Lee Whitney)
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If the user has generated a ssh public/private key pair set before
check which key have been authorized on your github or gitlab account sett...
Set up DNS based URL forwarding in Amazon Route53 [closed]
...NS service (Nettica) allowed me to route requests to "aws.example.com" to "https://myaccount.signin.aws.amazon.com/console/".
...
Just what is Java EE really? [closed]
...
Why are Java EE libraries not "standard" and included in the regular JVM download and/or the SDK?
Java EE in a way was one of the first attempts to split up the already massive JDK into chunks that are easier to manage and download. People are already complaining that the graphical classes (AWT, ...
Using the “final” modifier whenever applicable in Java [closed]
... it...
Adding final to all things which should not change simply narrows down the possibilities that you (or the next programmer, working on your code) will misinterpret or misuse the thought process which resulted in your code. At least it should ring some bells when they now want to change your ...
Best practice for Python assert
...hey shouldn't have access to. It wouldn't work, but I want to swiftly shut down their attempt with an assert, so having that optimized away in production would defeat the purpose. I guess I'll just raise an Exception instead. Oh - I just discovered an aptly named SuspiciousOperation Exception with s...
How to grep for two words existing on the same line? [duplicate]
...ge and 'word1' occurs frequently, then you may be passing significant data down the pipe where a single command avoids that overhead. Against that, the regex is more complex; you might need to benchmark it to find out what's best — but only if performance really matters. If you run two commands,...