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Test if a command outputs an empty string
...er of maximally 1 character using head -c1(thanks to netj for posting this idea in the comments below)
compare that number with zero
So for example, instead of:
if [[ $(ls -A) ]]
I would use:
if [[ $(ls -A | wc -c) -ne 0 ]]
# or:
if [[ $(ls -A | head -c1 | wc -c) -ne 0 ]]
Instead of:
if [ ...
Scala vs. Groovy vs. Clojure [closed]
... work we have a codebase of 11 milions lines of Scala, which is not a good idea but it works.
– Joan
Mar 8 '16 at 14:25
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Differences between distribute, distutils, setuptools and distutils2?
...te and become the standard tool included in Python's standard library. The idea was that distutils2 would be distributed for old Python versions, and that distutils2 would be renamed to packaging for Python 3.3, which would include it in its standard library. These plans did not go as intended, howe...
Avoiding if statement inside a for loop?
... a functor. It gets inlined at compile-time, no performance penalty.
The idea of passing in what varies is ubiquitous in the C++ Standard Library. It is called the strategy pattern.
If you are allowed to use C++11, you can do something like this:
#include <iostream>
#include <set>
#i...
Can I list-initialize a vector of move-only type?
...gt; idiom described on cpptruths (cpptruths.blogspot.com/2013/09/…). The idea is to determine lvalue/rvalue at run-time and then call move or copy-construction. in<T> will detect rvalue/lvalue even though the standard interface provided by initializer_list is const reference.
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Getting command-line password input in Python
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@asf107 - The idea behind requesting a password is so that you can pass it along to authenticate with something (IE, I'm using this to request a password to authenticate with an online server). If a hacker commented out the line, the progr...
Getting “CHECKOUT can only be performed on a version resource” when trying to commit using Eclipse s
...igured out what happened.
If you use SVN add-on with Eclipse or IntelliJ IDEA and delete some files our of it (from system's file browser, then you will get this message as well.
The only way I was able to solve it in IDEA was to commit changes via external SVN tool, then reopened the IDE and ch...
Try catch statements in C
...ldn't resist replying to this. Let me first say I don't think it's a good idea to simulate this in C as it really is a foreign concept to C.
We can use abuse the preprocessor and local stack variables to give use a limited version of C++ try/throw/catch.
Version 1 (local scope throws)
#include &...
How to set IntelliJ IDEA Project SDK
I just installed IntelliJ IDEA and when I try to create my first Project it asks for me to set up the Project SDK. When I click on "JDK" it asks for me to select the home directory of the JDK as shown in this image.
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Splitting a string into chunks of a certain size
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@MartinStettner: That's certainly a decent idea if this is a common operation.
– Eamon Nerbonne
Sep 21 '09 at 8:05
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