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How do you declare an interface in C++?
...hat does not provide an implementation of foo() will also be abstract. In order to stop being abstract, a derived class must provide implementations for all pure virtual functions it inherits.
Note that an abstract base class can be more than an interface, because it can contain data members and m...
Do Java arrays have a maximum size?
...vote answers that are plain and simply wrong. Does the difference of five bytes actually matter in the real world, NO, of course not. But it concerns me that people are willing to give an answer "authoritatively" without even trying it to see if it really works. As for the memory limit, well, DUH....
Cosmic Rays: what is the probability they will affect a program?
...rror Rate of 10-12 for their memory modules", "a observed error rate is 4 orders of magnitude lower than expected". For data-intensive tasks (8 GB/s of memory reading) this means that single bit flip may occur every minute (10-12 vendors BER) or once in two days (10-16 BER).
2009 Google's paper "DR...
Solution to INSTALL_FAILED_INSUFFICIENT_STORAGE error on Android [closed]
... root access do: # su # du /data | sort -g to get a list of folders/files ordered by size
– JuanMa Cuevas
Aug 13 '13 at 12:06
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What are Unwind segues for and how do you use them?
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In a Nutshell
An unwind segue (sometimes called exit segue) can be used to navigate back through push, modal or popover segues (as if you popped the navigation item from the navigation bar, closed the popover or dismissed the modally presented view controller). On to...
BAT file: Open new cmd window and execute a command in there
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Adding /k between two commands executes both command in order.
Example:
cmd /k echo "hello"
this command will first open command prompt then execute echo "hello" command
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新浪是如何分析处理32亿条实时日志的？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...们起初采用官方Kibana v3，用户提出的类似SQL中的多个group by，画百分比，求指定区间占比等常见需求无法满足。之后通过三斗大神(微博@argv)定制版的Kibana 3满足了一些用户需求。Kibana 4诞生后，代码几乎是对Kibana3的重写，做了大...
Is there still any reason to learn AWK?
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+1 Sold. I am going to order this book. I have used awk for years as a quick and powerful one-liner scripting language. Awk is a great pre-processor for files that would otherwise take a dozen lines to code. I cannot count how many times I have use...
How are the points in CSS specificity calculated
...n CSS:
Specificities are compared by comparing the three components in order: the specificity with a larger A value is more specific; if the two A values are tied, then the specificity with a larger B value is more specific; if the two B values are also tied, then the specificity with a larger c...
How can I use Autolayout to set constraints on my UIScrollview?
..., Command click both the content view and the scroll view's parent view in order to select them both. Then set the heights to be equal (Control drag from the Content View to the Scroll View). This is also key. Because we are scrolling horizontally, the scroll view's content view won't know how high ...