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Why are arrays covariant but generics are invariant?
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153
Via wikipedia:
Early versions of Java and C# did not include generics (a.k.a. parametric pol...
How to detect if CMD is running as Administrator/has elevated privileges?
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13 Answers
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How to detect that animation has ended on UITableView beginUpdates/endUpdates?
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293
What about this?
[CATransaction begin];
[CATransaction setCompletionBlock:^{
// animation ...
All possible array initialization syntaxes
...s above, the first two could replace the string[] on the left with var (C# 3+), as the information on the right is enough to infer the proper type. The third line must be written as displayed, as array initialization syntax alone is not enough to satisfy the compiler's demands. The fourth could also...
How can I return NULL from a generic method in C#?
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13 Answers
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File Upload using AngularJS
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348
Some of the answers here propose using FormData(), but unfortunately that is a browser object ...
How to install JSTL? The absolute uri: http://java.sun.com/jstl/core cannot be resolved
...web.xml is declared conform at least Servlet 2.4 and thus not as Servlet 2.3 or older. Otherwise EL expressions inside JSTL tags would in turn fail to work. Pick the highest version matching your target container and make sure that you don't have a <!DOCTYPE> anywhere in your web.xml. Here's a...
Is it safe to parse a /proc/ file?
...atomic, as someone mentioned in another answer -- but only since Linux 2.6.30, which is less than two years old. So even this tiny, trivial file was subject to a race condition until then, and still is in most enterprise kernels. See fs/proc/uptime.c for the current source, or the commit that made...
Block Comments in a Shell Script
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356
In bash:
#!/bin/bash
echo before comment
: <<'END'
bla bla
blurfl
END
echo after commen...
Floating View 扩展：悬浮视图扩展，将组件转换为悬浮窗口 · App Inventor 2 中文网
.... 聊天应用悬浮窗
2. 音乐播放器悬浮控制
3. 视频播放悬浮窗
4. 快捷工具悬浮窗
5. 通知悬浮窗
6. 组件重叠布局
使用说明
基本使用步骤
重要提示
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