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Why use pointers? [closed]
I know this is a really basic question, but I've just started with some basic C++ programming after coding a few projects with high-level languages.
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What is a lambda expression in C++11?
...rently in scope by reference [&]
same as 3, but by value [=]
You can mix any of the above in a comma separated list [x, &y].
The argument list
The argument list is the same as in any other C++ function.
The function body
The code that will be executed when the lambda is actually calle...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...个Master都提供read-write服务。这个模型是Master-Slave的加强版，数据间同步一般是通过Master间的异步完成，所以是最终一致性。 Master-Master的好处是，一台Master挂了，别的Master可以正常做读写服务，他和Master-Slave一样，当数据没有被...
What's the fastest way to merge/join data.frames in R?
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Thought it would be interesting to post a benchmark with dplyr in the mix: (had a lot of things running)
test replications elapsed relative user.self sys.self
5 dplyr 1 0.25 1.00 0.25 0.00
3 data.tableGood 1 0.28 1.12 0.27 ...
Comparing Haskell's Snap and Yesod web frameworks
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The dual nature of friendly competition and mix-and-match in Haskell web development seems very promising. That said, I'd recommend getting snap-auth over to hackage asap. Sessions and authentication are a big deal.
– Dan Burton
A...
How to use java.net.URLConnection to fire and handle HTTP requests?
...e");
Uploading files
You'd normally use multipart/form-data encoding for mixed POST content (binary and character data). The encoding is in more detail described in RFC2388.
String param = "value";
File textFile = new File("/path/to/file.txt");
File binaryFile = new File("/path/to/file.bin");
Stri...
Multithreading: What is the point of more threads than cores?
...e of threads, which is parallelism: to run several separate lines of execution at once. In an 'ideal' system, you would have one thread executing per core: no interruption. In reality this isn't the case. Even if you have four cores and four working threads, your process and it threads will const...
How can I unit test Arduino code?
...icrocontroller Device/Emulator/Sim-based tests
There's a lot of discussion about what unit test means and I'm not
really trying to make an argument about that here. This post is not
telling you to avoid all practical testing on your ultimate target
hardware. I am trying to make a point abo...
What is “entropy and information gain”?
...ss into the purest possible children nodes (ie: nodes that don't contain a mix of both male and female, rather pure nodes with only one class).
This measure of purity is called the information. It represents the expected amount of information that would be needed to specify whether a new instance (...
How to parse/format dates with LocalDateTime? (Java 8)
...d.
This still did not cover the complexity of the time zones. And yet, the mix of the above APIs was really a pain to work with. So as Java developers started working on global web applications, libraries that targeted most use cases, like JodaTime, got quickly popular. JodaTime was the de-facto sta...