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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 ...
BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...与前面几代不同的是，蓝牙4.0版引入的BLE协议更注重功耗问题，而非通信速率的提升。这也使得低功耗蓝牙更加节能，能使设备的电池维持很长时间，因此在很多可穿戴设备中得到了应用。
0x2 BLE工作流程0x21 工作过程蓝牙适用...
Why does multiprocessing use only a single core after I import numpy?
...affinity on import. As far as I can tell, this problem seems to be specifically caused by them linking against multithreaded OpenBLAS libraries.
A workaround is to reset the task affinity using
os.system("taskset -p 0xff %d" % os.getpid())
With this line pasted in after the module imports, my ex...
Implement C# Generic Timeout
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The really tricky part here was killing the long running task through passing the executor thread from the Action back to a place where it could be aborted. I accomplished this with the use of a wrapped delegate that passes out th...
Mac OS X 入门操作常见问题集锦（持续更新） - 更多技术 - 清泛网 - 专注C/...
Mac OS X 入门操作常见问题集锦（持续更新）如何截图：shift + command + 3 截整屏shift + command + 4 截窗口（默认png，并保存到桌面）shift + command + Ctrl + 4 如何截图：
shift + command + 3 截整屏
shift + command + 4 截窗口（默认png，并保存...
Discuz与phpsso整合时无法同步登录：通过js load 另一个 script 文件导致的...
...t;/' + 'script>');复制代码通常来说用这个方法是没有什么问题的，但是最近在帮人分析整合 phpcms 与 discuzx 同步登录时，发现在 discuzx 登录后无论如何也没能让 phpcms 同步登录。原因是 dz 的登录采用的是 ajax 方式，ucenter 返回的...
Android中Java和JavaScript交互 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ChromeClient() {});
Uncaught ReferenceError: functionName is not defined
问题出现原因，网页的js代码没有加载完成，就调用了js方法。解决方法是在网页加载完成之后调用js方法：
myWebView.setWebViewClient(new WebViewClient() {
@Override
public void o...
Greenlet Vs. Threads
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Greenlets provide concurrency but not parallelism. Concurrency is when code can run independently of other code. Parallelism is the execution of concurrent code simultaneously. Parallelism is particularly useful when there's a lot of work to be done in userspace, an...
Virtual functions and performance - C++
...e a very slight effect on performance, but it's unlikely to affect the overall performance of your application. Better places to look for performance improvements are in algorithms and I/O.
An excellent article that talks about virtual functions (and more) is Member Function Pointers and the Fastes...
SQL Server Management Studio, how to get execution time down to milliseconds
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The part regarding the Properties window is really the answer to this thread. "Elapsed Time" is sitting there staring you in the face.
– Eric
Jan 20 '15 at 23:32
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