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重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...
...要测试同学干嘛？”有过这种想法的自觉举手~
提高编程速度：好的代码才更容易扩展功能，烂的代码，你想加个功能都加不进去，告诉我不是一个人有这种经历。。。
重构的时机？
三次法则、添加功能时、修补错...
How do I add the contents of an iterable to a set?
...
@eipxen: There's | for union, & for intersection, and ^ for getting elements that are in one or the other but not both. But in a dynamically typed language where it's sometimes difficult to read the code and know the types of objects flying aro...
Get difference between two lists
...the following simple function.
def diff(list1, list2):
c = set(list1).union(set(list2)) # or c = set(list1) | set(list2)
d = set(list1).intersection(set(list2)) # or d = set(list1) & set(list2)
return list(c - d)
or
def diff(list1, list2):
return list(set(list1).symmetric_d...
How to generate a range of numbers between two numbers?
...0
DECLARE @endnum INT=1050
;
WITH gen AS (
SELECT @startnum AS num
UNION ALL
SELECT num+1 FROM gen WHERE num+1<=@endnum
)
SELECT * FROM gen
option (maxrecursion 10000)
share
|
improv...
The maximum recursion 100 has been exhausted before statement completion
...nt int;
;with DateList as
(
select @STARTDATE DateValue
union all
select DateValue + 1 from DateList
where DateValue + 1 < convert(VARCHAR(15),@EntDt,101)
)
select count(*) as DayCnt from (
select DateValue,DATENAME(WEEKDAY, DateValue ) as WE...
Condition within JOIN or WHERE
...left/right table rows extended by NULLs. FULL JOIN returns INNER JOIN rows UNION ALL unmatched left & right table rows extended by NULLs. Always know what INNER JOIN you want as part of an OUTER JOIN. A WHERE or ON that requires a possibly NULL-extended column to be not NULL after an OUTER JOIN ...
ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
...码就可以达到很好的效果。使用 Custom draw 来对控件外观编程甚至可以代替很多的古老方法。
以下代码是在WIN98 和VC6 SP2的环境下写的，common controls DLL的版本是5.0。我已经对其在WinNT 4上进行了测试。系统要运行这些代码，它的com...
Selecting data from two different servers in SQL Server
... 'Server=YOUR SERVER;Trusted_Connection=yes;','SELECT * FROM Table1') AS a
UNION
SELECT * FROM OPENROWSET('SQLNCLI', 'Server=ANOTHER SERVER;Trusted_Connection=yes;','SELECT * FROM Table1') AS a
share
|
...
【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...值。这是一个列表的列表！
“列表的列表”是数据科学编程的重要数据结构。数据通常采用这种格式。想象一个每行包含两个元素的长列表，例如有两列的电子表格:
添加3个列表块到现有代码块中:
对于第一个插槽，元素...
What does immutable mean?
...ure but with mutable elements. This happens in some variations of undoable union-find IIRC. Immutability has big advantages, but sharing part or all of a data structure as an optimisation is perfectly possible with mutables. Even if you want apparent immutability for other references, you can always...