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Covariance and contravariance real world example

... contravariantFish = contravariantAnimal; }//method }//class // .NET Framework Examples: public interface IList<T> : ICollection<T>, IEnumerable<T>, IEnumerable { } public interface IEnumerable<out T> : IEnumerable { } class Delegates { // When T is used as b...
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How can I use different certificates on specific connections?

...ev-server.pem. Password: changeit Restart JVM Source: How to solve javax.net.ssl.SSLHandshakeException? share | improve this answer | follow | ...
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What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?

... or lang-arg mode, you need to use :map!, etc. (Source: vimdoc.sourceforge.net/htmldoc/map.html#map-overview) – Ken Bellows Jun 26 '13 at 14:00 3 ...
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asynchronous vs non-blocking

...(as supported by Windows sockets), or the asynchronous IO pattern used in .NET, are more convenient. You call a method to start an operation, and the framework calls you back when it's done. Even here, there are basic differences. Asynchronous Win32 sockets "marshal" their results onto a specific GU...
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Set focus on TextBox in WPF from view model

...overflow :). The best way to track down issues with Focus is... debugging .Net source code. No kidding. It saved me a lot of time many times. To enable .net source code debugging refer to Shawn Bruke's blog. Finally, general approach that I use to set focus from ViewModel is Attached Properties. I w...
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How can I build a small operating system on an old desktop computer? [closed]

... http://www.osdev.org/ and http://www.osdever.net/ welcome to the OS Development world. See also other x86 documentation links in SO's x86 tag wiki: Intel and AMD manuals, compiler / assembler docs, and various guides. It also suggests using BOCHS or other virtual en...
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Can you explain the concept of streams?

...hout changing your processing logic. For example, to read your data from a network socket instead of a file: Stream stream = new NetworkStream(mySocket); StreamReader reader = new StreamReader(stream); int x = ReadInt(reader); As easy as it can be. And the beauty continues, as you can use any kin...
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Running a Haskell program on the Android OS

... small tests before you go full on. jhc does have a manual http://repetae.net/computer/jhc/manual.html and a section on setting-up cross-compilation and .ini file with options: http://repetae.net/computer/jhc/manual.html#crosscompilation. L01man: The second part is an alternative to the first. ...
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How can I parse a CSV string with JavaScript, which contains comma in data?

...'); } char = '"' '"' { return '"'; } / [^"] Test at http://jsfiddle.net/knvzk/10 or https://pegjs.org/online. Download the generated parser at https://gist.github.com/3362830. share | improv...
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Seeding the random number generator in Javascript

...ss is so low, that improper use can actually cause bugs in your program! Nonetheless, it is significantly better than some answers suggesting to use Math.sin or Math.PI! It's a one-liner though, which is nice :). var LCG=s=>()=>(2**31-1&(s=Math.imul(48271,s)))/2**31; This implementation...