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John Carmack's Unusual Fast Inverse Square Root (Quake III)

...tation, 0x5f3759df" https://mrob.com/pub/math/numbers-18.html On the same site it explains the whole thing. https://mrob.com/pub/math/numbers-16.html#le009_16 share | improve this answer |...
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How should I ethically approach user password storage for later plaintext retrieval?

As I continue to build more and more websites and web applications I am often asked to store user's passwords in a way that they can be retrieved if/when the user has an issue (either to email a forgotten password link, walk them through over the phone, etc.) When I can I fight bitterly against thi...
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BLE(二)信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区,...

文章源自:https://www.gandalf.site/2018/11/ble_23.html 参考低功耗蓝牙(BLE)安全初探 0x1 信道BLE的物理通道即“频道,分别是‘f=2402+k*2 MHz, k=0, … ,39’,带宽为2MHz”的40个RF Channel。 其中,有3个信道是advertising channel(广播通道)...
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不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...种方法 利用linux的策略路由 网上查找的参考资料 http://www.cnblogs.com/gunl/archive/2010/09/14/1826234.html 知识准备 一、原理说明 1、路由表(table)从0到255进行编号,每个编号可以对应一个别名,编号和别名的对应关系在linux下放...
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What to gitignore from the .idea folder?

...e file generated for IntelliJ contains the following # Created by https://www.gitignore.io/api/intellij ### Intellij ### # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles...
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Reserved keywords in JavaScript

...lter, removeFilter (they, among others, are reserved methods). See http://www.jabcreations.com/blog/internet-explorer-9 for a more extensive 'currently known' list specific to IE9. I have yet find any official reference to them on msdn (or elsewhere). ...
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Do I really need to encode '&' as '&'?

I'm using an ' & ' symbol with HTML5 and UTF-8 in my site's <title> . Google shows the ampersand fine on its SERPs, as do all the browsers in their titles. ...
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Drawing Isometric game worlds

...rect, complete one. However, I combined his hints with those from another site to create code that works in my app (iOS/Objective-C), which I wanted to share with anyone who comes here looking for such a thing. Please, if you like/up-vote this answer, do the same for the originals; all I did was "...
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Is quoting the value of url() really necessary?

...th usage. This might feel like that is not important, but high traffic websites prefer to save bandwidth and over lots of css files, and url references in them it make sense to choose the option that make the file smaller... Even because there is no advantage in not doing so. Note: you might have ...
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serve current directory from command line

...: ~ $ cd tmp ~/tmp $ serve # ~/tmp served on port 3000 ~/tmp $ cd ../www ~/www $ serve 5000 # ~/www served on port 5000 share | improve this answer | follow ...