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Formula to determine brightness of RGB color
...Note that both of these emphasize the physiological aspects: the human eyeball is most sensitive to green light, less to red and least to blue.
– Bob Cross
Feb 27 '09 at 19:28
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Override back button to act like home button
... like stop animations and other things that consume a noticeable amount of CPU in order to make the switch to the next activity as fast as possible, or to close resources that are exclusive access such as the camera.
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Fast way of finding lines in one file that are not in another?
...ind lines common to both files
comm -12 file1 file2
The man file is actually quite readable for this.
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Condition within JOIN or WHERE
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The relational algebra allows interchangeability of the predicates in the WHERE clause and the INNER JOIN, so even INNER JOIN queries with WHERE clauses can have the predicates rearrranged by the optimizer so that they may already be excluded durin...
How often should you use git-gc?
...ons that could create many loose objects." Anyone know which commands actually run it?
– Joshua Dance
Jul 8 '14 at 15:36
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Why is ArrayDeque better than LinkedList
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Also another small disadvantage (for real-time applications) is that on a push/add operation it takes a bit more when the internal array of the ArrayDeque is full, as it has to double its size and copy all the data.
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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...也可以解决多用户需要同时访问外网但公有IP地址不足的问题。同时可以作为一个防火墙，隔离内网与外网，并且能提供监控网络和记录传输信息的功能，加强局域网的安全性等。它的主要作用有以下几点。
1．共享网络
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What's the equivalent of Java's Thread.sleep() in JavaScript? [duplicate]
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Spinning a loop cause High CPU utilization.
– Niger
Sep 19 '09 at 1:10
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What are bitwise operators?
I'm someone who writes code just for fun and haven't really delved into it in either an academic or professional setting, so stuff like these bitwise operators really escapes me.
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Difference between malloc and calloc?
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calloc() gives you a zero-initialized buffer, while malloc() leaves the memory uninitialized.
For large allocations, most calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mm...