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Covariance and contravariance real world example

... you have a method that returns an IEnumerable<Teacher>. Covariance allows you to directly use that result for the methods that take an IEnumerable<Person>, substituting a more derived type for a less derived (more generic) type. Contravariance, counter-intuitively, allows you to use a...
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Utilizing the GPU with c# [closed]

...OpenTK -- dead/Cloo) - many of these are just bindings - ie enable you to call the GPU from C#, but your kernel code (code which is actually run on the GPU) needs to be written in C or OpenCL, meaning you must use (and learn) another language. As I said, I would recommend Cudafy over all the other...
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Why “decimal” is not a valid attribute parameter type?

It is really unbelievable but real. This code will not work: 3 Answers 3 ...
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How to replace a whole line with sed?

... Michael J. Barber, g replace all the instance of regexp with replacement – A-IV Mar 28 '17 at 19:06 ...
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Do Google refresh tokens expire?

...ion of refresh tokens. Instead of issuing a long lasting token (typically good for a year or unlimited lifetime), the server can issues a short-lived access token and a long lived refresh token. So in short you can use refresh tokens again and again until the user who authorized the ac...
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Create a hexadecimal colour based on a string with JavaScript

I want to create a function that will accept any old string (will usually be a single word) and from that somehow generate a hexadecimal value between #000000 and #FFFFFF , so I can use it as a colour for a HTML element. ...
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Why use non-member begin and end functions in C++11?

...r that container. However, C++11 has apparently introduced free functions called std::begin and std::end which call the begin and end member functions. So, instead of writing ...
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Getting an object from an NSSet

...rate through (e.g. with enumerateObjectsUsingBlock or NSFastEnumeration), call containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects. A set is appropriate when you don't want duplicates, don't care about...
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jQuery .hasClass() vs .is()

... Just because a function has less funtionality does NOT mean it's automatically faster. – Kris Feb 4 '11 at 19:54 15 ...
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“Active Directory Users and Computers” MMC snap-in for Windows 7?

...able for use in Windows 7? I just need to browse the membership of some small Active Directory groups that are deep within a huge hierarchy, so I can eventually write code to work with those groups. The Windows Server 2003 version of the installer works, but the resulting MMC snap in just won't st...