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What are the git concepts of HEAD, master, origin?
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I highly recommend the book "Pro Git" by Scott Chacon. Take time and really read it, while exploring an actual git repo as you do.
HEAD: the current commit your repo is on. Most of the time HEAD points to the latest commit in your current branch, but that doesn't have to be the case. HEAD rea...
Do I cast the result of malloc?
... someone suggested in a comment that I should not cast the result of malloc , i.e.
29 Answers
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Small Haskell program compiled with GHC into huge binary
Even trivially small Haskell programs turn into gigantic executables.
2 Answers
2
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How do I execute a command and get the output of the command within C++ using POSIX?
...use the C stdio API, I prefer the iostreams API. popen requires you to manually clean up the FILE handle, pstreams do that automatically. popen only accepts a const char* for the argument, which requires care to avoid shell injection attacks, pstreams allows you to pass a vector of strings similar t...
List vs Set vs Bag in NHibernate
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NHibernate semantics:
List: Ordered collection of entities, duplicate allowed. Use a .NET IList in code. The index column will need to be mapped in NHibernate.
Set: Unordered collection of unique entities, duplicates not allowed. Use Iesi.Collection.ISet in code (NH prior to v4) or System.Colle...
Parsing IPv6 extension headers containing unknown extensions
... you don't know how to interpret.
Routers can route such packets, because all they need is the routing header. Deep packet inspection gadgets and suchlike need to know a lot, but then that's their fate anyway.
Edited to add: This design means that middleboxes can only change what they know. If a m...
Detect if stdin is a terminal or pipe?
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Summary
For many use cases the POSIX function isatty() is all what it is needed to detect if stdin is connected to a terminal. A minimal example:
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv)
{
if (isatty(fileno(stdin)))
puts("stdin is co...
Order discrete x scale by frequency/value
... rearrange it so that it is ordered by the value of the y-axis (i.e., the tallest bar will be positioned on the left).
5 An...
Is it possible to do start iterating from an element other than the first using foreach?
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Good call. WTB auto-complete (gahh can't remember the real name of it) in stackoverflow ;)
– MoarCodePlz
Jun 21 '11 at 17:56
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Hexadecimal To Decimal in Shell Script
...not on his list:
[ghoti@pc ~]$ dc -e '16i BFCA3000 p'
3217698816
But if all you want to do is subtract, why bother changing the input to base 10?
[ghoti@pc ~]$ dc -e '16i BFCA3000 17FF - p 10o p'
3217692673
BFCA1801
[ghoti@pc ~]$
The dc command is "desk calc". It will also take input from st...