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Covariance, Invariance and Contravariance explained in plain English?

Today, I read some articles about Covariance, Contravariance (and Invariance) in Java. I read the English and German Wikipedia article, and some other blog posts and articles from IBM. ...
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Creating a daemon in Linux

In Linux I want to add a daemon that cannot be stopped and which monitors filesystem changes. If any changes are detected, it should write the path to the console where it was started plus a newline. ...
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mysql update column with value from another table

I have two tables, both looking like 8 Answers 8 ...
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Oracle query to fetch column names

I have a mySQL query to get columns from a table like this: 12 Answers 12 ...
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Angularjs if-then-else construction in expression

Can I somehow use if-then-else construction (ternary-operator) in angularjs expression, for example I have function $scope.isExists(item) that has to return bool value. I want something like this, ...
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SVN checkout ignore folder

Can I ignore a folder on svn checkout? I need to ignore DOCs folder on checkout at my build server. 10 Answers ...
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What is the “assert” function?

I've been studying OpenCV tutorials and came across the assert function; what does it do? 9 Answers ...
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Fastest sort of fixed length 6 int array

Answering to another Stack Overflow question ( this one ) I stumbled upon an interesting sub-problem. What is the fastest way to sort an array of 6 integers? ...
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Split files using tar, gz, zip, or bzip2 [closed]

I need to compress a large file of about 17-20 GB. I need to split it into several files of around 1GB per file. 4 Answers ...
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When would anyone use a union? Is it a remnant from the C-only days?

I have learned but don't really get unions. Every C or C++ text I go through introduces them (sometimes in passing), but they tend to give very few practical examples of why or where to use them. When would unions be useful in a modern (or even legacy) case? My only two guesses would be programming ...