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Is there YAML syntax for sharing part of a list or map?
... don't see anything on it in the current official YAML spec: yaml.org/spec/1.2/spec.html. That page doesn't contain the word "merge", nor the text "<<", nor the phrase "key type". The << syntax does work in the Python yaml package though. Do you know where I can find out more about these...
Callback functions in C++
...llers of certain events which enables a certain amount of static / compile time flexibility.
Personally, I use a local optimization library that uses two different callbacks:
The first callback is called if a function value and the gradient based on a vector of input values is required (logic cal...
SQL JOIN and different types of JOINs
...nerates all the days in January 2017
FROM generate_series(
'2017-01-01'::TIMESTAMP,
'2017-01-01'::TIMESTAMP + INTERVAL '1 month -1 day',
INTERVAL '1 day'
) AS days(day)
-- Here, we're combining all days with all departments
CROSS JOIN departments
Which combines all rows from one table with ...
How to make my custom type to work with “range-based for loops”?
...; such an overload will not be called by a for(:) loop. See [stmt.ranged] 1.2-1.3 from n4527.
² Either call the begin/end method, or ADL-only lookup of free function begin/end, or magic for C-style array support. Note that std::begin is not called unless range_expression returns an object of typ...
Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...获得基础车费3.5倍的收入，平常时段为2倍，其他系列为1.2倍。以人民优步为例，在上下班高峰期，司机接下一个车费为20元的下单并完成后，其收入是：基础车费20元3.5倍的收入70元，系统收取20%佣金后如数返还，基础车费45%的...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...户分别对这两台机器进行读写于是数据又不同步了。
1.2 分布式文件系统
对网上很多分布式文件系统进行了简单的了解和阅读。
如Lustre、
HDFS
MogileFS
FastDFS
OpenAFS
MooseFS
pNFS
GoogleFS
TFS（taobao）。
仔细阅读下来，发现上...
How do I measure request and response times at once using cURL?
...r our purposes we’ll focus just on the timing details that are provided. Times below are in seconds.
Create a new file, curl-format.txt, and paste in:
time_namelookup: %{time_namelookup}s\n
time_connect: %{time_connect}s\n
time_appconnect: %{time_appconnect}s\n
time_pretran...
How to retrieve an element from a set without removing it?
...t(s)[0] by three characters and is otherwise dramatically superior in both time and space complexity. So, while the claim of "least code" is trivially true, it's also trivially true that this is the worst possible approach. Even manually removing and then re-adding the removed element to the origina...
How to calculate time elapsed in bash script?
I print the start and end time using date +"%T" , which results in something like:
20 Answers
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Python logging: use milliseconds in time format
By default logging.Formatter('%(asctime)s') prints with the following format:
10 Answers
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