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Adding up BigDecimals using Streams
...lueOf(8)));
invoices.add(new Invoice("C4", "I-004", BigDecimal.valueOf(1.2), BigDecimal.valueOf(7)));
// Java 8 approach, using Method Reference for mapping purposes.
invoices.stream().map(Invoice::total).forEach(System.out::println);
System.out.println("Sum = " + invoices.stream()....
How to use Sphinx's autodoc to document a class's __init__(self) method?
...those with names like __special__) be documented by autodoc.
Since Sphinx 1.2, this option takes arguments which makes it more useful than it was previously.
Use automethod:
.. autoclass:: MyClass
:members:
.. automethod:: __init__
This has to be added for every class (cannot be us...
Simple explanation of clojure protocols
...had Protocols since version 1.0: Seq is a Protocol, for example. But until 1.2, you couldn't write Protocols in Clojure, you had to write them in the host language.
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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...动的时候，是100ms，当有IO线程抢到listen的权利后，这个timer会被改成60s，随后，每60s进行一次listen的切换,而之前拥有listen权利的IO线程则会停掉它的read_watcher
3.4 设定io线程的执行体函数easy_io_on_thread_start
3.5 设定io线程被...
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...