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Why would I ever use push_back instead of emplace_back?
C++11 vectors have the new function emplace_back . Unlike push_back , which relies on compiler optimizations to avoid copies, emplace_back uses perfect forwarding to send the arguments directly to the constructor to create an object in-place. It seems to me that emplace_back does everything p...
How to elegantly check if a number is within a range?
...>= 1 && x <= 100)
//true
Also, check out this SO post for regex options.
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How to find unused/dead code in java projects [closed]
...sed/dead code in large java projects? Our product has been in development for some years, and it is getting very hard to manually detect code that is no longer in use. We do however try to delete as much unused code as possible.
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Starting python debugger automatically on error
This is a question I have wondered about for quite some time, yet I have never found a suitable solution. If I run a script and I come across, let's say an IndexError, python prints the line, location and quick description of the error and exits. Is it possible to automatically start pdb when an err...
django import error - No module named core.management
Ok, I see plenty of these errors around. I have tried everything I know to do and have yet to figure this out.
29 Answers
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Dynamic variable names in Bash
..._variable[$1]}
}
If you can't use associative arrays (e.g., you must support bash 3), you can use declare to create dynamic variable names:
declare "magic_variable_$1=$(ls | tail -1)"
and use indirect parameter expansion to access the value.
var="magic_variable_$1"
echo "${!var}"
See BashFAQ...
SELECT INTO a table variable in T-SQL
...the UserData 'oldlocation' variable. Will SQL just map these automatically or will it throw some kind of exception?
– Aran Mulholland
Nov 17 '15 at 7:23
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What does this thread join code mean?
...mean?
To quote from the Thread.join() method javadocs:
join() Waits for this thread to die.
There is a thread that is running your example code which is probably the main thread.
The main thread creates and starts the t1 and t2 threads. The two threads start running in parallel.
The main...
Set Django IntegerField by choices=… name
...
Do as seen here. Then you can use a word that represents the proper integer.
Like so:
LOW = 0
NORMAL = 1
HIGH = 2
STATUS_CHOICES = (
(LOW, 'Low'),
(NORMAL, 'Normal'),
(HIGH, 'High'),
)
Then they are still integers in the DB.
Usage would be thing...
.classpath and .project - check into version control or not?
...multiple modules in a tree of dependencies. All those modules are subdirectories in a subversion repository. For newcomers to our project, it's a lot of work to set all that up manually in eclipse.
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