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Difference between Covariance & Contra-variance
...uence of Tigers can be used where a sequence of Animals is needed, but the opposite is not true. A sequence of animals cannot necessarily be used where a sequence of Tigers is needed.
That's covariance. Now consider this subset of the set of all types:
{ IComparable<Tiger>,
IComparable<...
When is it right for a constructor to throw an exception?
...
I'd say the opposite is the case - if we don't want partially created objects, the constructor should throw when there's a problem - that way the caller will know something went wrong.
– Blair Conrad
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Grep and Sed Equivalent for XML Command Line Processing
...I'd point out that there are Windows binaries available on the Sourceforge site.
– Steve Bennett
Jun 8 '11 at 5:26
Doe...
What does “javascript:void(0)” mean?
...it behaves like a button, that's how really you should mark it up.
(*: in site authoring, anyway. Obviously they are useful for bookmarklets. javascript: pseudo-URLs are a conceptual bizarreness: a locator that doesn't point to a location, but instead calls active code inside the current location. ...
What are major differences between C# and Java?
...uperior language in terms of productivity and readability. If you feel the opposite, could you clarify your levels of experience in both languages? I think it's pretty relevant to the discussion.
– Jon Skeet
Jan 19 '11 at 12:06
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Is embedding background image data into CSS as Base64 good or bad practice?
...css file it will take the browser longer to download the file leaving your site without any of the style information until the download completes. For small images that you don't intend on changing often if ever it is a fine solution.
as far as generating the base64 encoding:
http://b64.io/
http...
Reconnection of Client when server reboots in WebSocket
...sing PHP5 and the Chrome browser as client.
I have taken the code from the site http://code.google.com/p/phpwebsocket/ .
9...
HTML table headers always visible at top of window when viewing a large table
... Could you add a fiddle with a working code? (I know that there is in the site...)
– Michel Ayres
Mar 14 '14 at 14:53
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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）...
What is a columnar database?
...s columnar, et al. If you're not an IDC client you can get it free on our site. He's doing a webinar on June 16th, too (also on our site).
(BTW, one comment above lists asterdata but I don't think they are columnar.)
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