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How does deriving work in Haskell?
...en_render (conName, components) vars
-- function name is based on constructor name
= let funcName = makeName $ unCapalize $ nameBase conName
-- choose the correct builder function
headFunc = case vars of
...
Can I Replace Apache with Node.js?
..., for most website (for example Wordpress), the real bottleneck is the database and not the file access. And, if the file access is a problem then cache is always a viable solution. Anyways, for real performance, PHP-APC is a damn cheap trick.
– magallanes
Dec...
Window Features - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ng style bit is cleared and set again.
Hit testing of a layered window is based on the shape and transparency of the window. This means that the areas of the window that are color-keyed or whose alpha value is zero will let the mouse messages through. However, if the layered window has the WS_EX_TR...
How to use sessions in an ASP.NET MVC 4 application?
...sed PHP before and it was easy to create a session and select user records based on the current session variables.
5 Answe...
Xcode 4.5 Storyboard 'Exit'
... a slight subtlety to the requirements definition that might help. This is based on experimenting in Xcode 4.6. I found that it is specifically and only the declaring(!) of the method that enables the desired control-drag response from Xcode. Here's what I found to be the full requirements:
Marked...
How can I generate UUID in C#
...irst three Guid parts.
If you are transmitting the bytes (for example, as base64), you can't just use Guid.ToByteArray() and encode it. You'll need to Array.Reverse the first three parts (Data1-3).
I do it this way:
var rfc4122bytes = Convert.FromBase64String("aguidthatIgotonthewire==");
Array.Re...
Once upon a time, when > was faster than < … Wait, what?
...earing the depth buffer is faster these days has two reasons, both of them based around the fact that the GPU uses a hierarchical depth buffer. Therefor only has to clear set the tile states to clear (which is fast), changing the depth compare sign, however, means that the entire HiZ buffer needs to...
When should I use cross apply over inner join?
...where we need to replace INNER JOIN with CROSS APPLY.
1. Join two tables based on TOP n results
Consider if we need to select Id and Name from Master and last two dates for each Id from Details table.
SELECT M.ID,M.NAME,D.PERIOD,D.QTY
FROM MASTER M
INNER JOIN
(
SELECT TOP 2 ID, PERIOD,QTY
...
Using do block vs braces {}
...
The first and very common style was popularized by Ruby on Rails, and is based on a simple rule of single vs. multi-line:
Use braces { } for single-line blocks
Use do end for multi-line blocks
This makes sense because do/end reads badly in a one-liner, but for multi-line blocks, leaving a clos...
What's the difference between Sender, From and Return-Path?
...anks for giving the official RFC link. It's really useful if someone ask, "Based on what?"
– bayuah
Nov 22 '15 at 23:29
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