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Bash empty array expansion with `set -u`
...]+"${arr[@]}"} (column +"). Of note, several other expansions fail in Bash 4.2, including (unfortunately) the shorter ${arr[@]:0} idiom, which doesn't just produce an incorrect result but actually fails. If you need to support versions prior to 4.4, and in particular 4.2, this is the only working id...
When would anyone use a union? Is it a remnant from the C-only days?
I have learned but don't really get unions. Every C or C++ text I go through introduces them (sometimes in passing), but they tend to give very few practical examples of why or where to use them. When would unions be useful in a modern (or even legacy) case? My only two guesses would be programming ...
What's the right OAuth 2.0 flow for a mobile app
...n-8.2
The OAuth 2.0 implicit grant authorization flow (defined in Section 4.2 of OAuth 2.0 [RFC6749]) generally works with the practice of performing the authorization request in the browser and receiving the authorization response via URI-based inter-app communication.
However, as the implicit flo...
What does “=>” mean in PHP?
...i}: {$type}\n";
}
// prints:
// 0: car
// 1: truck
// 2: van
// 3: bike
// 4: rickshaw
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Virtual/pure virtual explained
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344
From Wikipedia's Virtual function
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In object-oriented programming, in languages such as ...
Trusting all certificates using HttpClient over HTTPS
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424
Note: Do not implement this in production code you are ever going to use on a network you do n...
O2O江湖:2015大洗牌 2016 BAT等巨头将“肉搏” - 资讯 - 清泛网 - 专注C/C++及内核技术
O2O江湖:2015大洗牌 2016 BAT等巨头将“肉搏”最冷的寒潮已经过去，春天的脚步将至，我们乐见O2O的重生，笑看曾经的模式辞旧迎新，迸发出新的活力。去年跨年前后，朋友圈几乎被各式的O2O盘点文给刷屏了，一年之后，2016年的1...
“using namespace” in c++ headers
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edited Feb 13 '13 at 0:14
answered May 1 '11 at 16:24
Mar...
UIView Hide/Show with animation
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In iOS 4 and later, there's a way to do this just using the UIView transition method without needing to import QuartzCore. You can just say:
Objective C
[UIView transitionWithView:button
duration:0.4
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