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Purpose of returning by const value? [duplicate]
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In the hypothetical situation where you could perform a potentially expensive non-const operation on an object, returning by const-value prevents you from accidentally calling this operation on a temporary. Imagine that + returned a non-const value, and you could write:
(a + b).expensiv...
How to send only one UDP packet with netcat?
...ght as well write
echo -n "hello" >/dev/udp/localhost/8000
and avoid all the idiosyncrasies and incompatibilities of netcat.
This also works sending to other hosts, ex:
echo -n "hello" >/dev/udp/remotehost/8000
These are not "real" devices on the file system, but bash "special" aliases....
Rollback to last git commit
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OK all is not lost! You can do git reflog this will allow you to see commits you did before the reset. You can then checkout those commits
– Chris Nevill
Aug 7 '15 at 11:50
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Is there a python equivalent of Ruby's 'rvm'?
Q: Do we have anything functionally equivalent in Python to the Ruby version manager 'rvm' ?
6 Answers
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How do I show a MySQL warning that just happened?
... - this may be version dependent, but I'm pretty sure it's been in MySQL 5 all this time.
– HorusKol
Feb 4 '11 at 0:14
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Latex Remove Spaces Between Items in List
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If you want to remove the spacing globally for every list in your document just put \setlist[itemize]{noitemsep} in your preamble.
– Fabian Winkler
Mar 13 '13 at 15:52
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How do I show multiple recaptchas on a single page?
...ave 2 forms on a single page. One of the forms has a recaptcha displaying all the time. The other should display a recaptcha only after a certain event such as maxing out login attempts. So there are times when I would need 2 recaptchas to appear on the same page. Is this possible? I know I cou...
Convert XLS to CSV on command line
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Open Notepad, create a file called XlsToCsv.vbs and paste this in:
if WScript.Arguments.Count < 2 Then
WScript.Echo "Error! Please specify the source path and the destination. Usage: XlsToCsv SourcePath.xls Destination.csv"
Wscript.Quit
End I...
How can a Metro app in Windows 8 communicate with a backend desktop app on the same machine?
... If anything this is the rule I would think that might be quoted "3.9 All app logic must originate from, and reside in, your app package You app must not attempt to change or extend the packaged content through any form of dynamic inclusion of code or data that changes how the application inter...
Should I use != or for not equal in T-SQL?
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Technically they function the same if you’re using SQL Server AKA T-SQL. If you're using it in stored procedures there is no performance reason to use one over the other. It then comes down to personal preference. I prefer to us...