大约有 4,400 项符合查询结果(耗时:0.0228秒) [XML]

https://www.tsingfun.com/it/tech/1429.html 

正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...e 30 Minute Regex Tutorial。由于评论里有过长的URL,所以本页排比较... 来园子之前写的一篇正则表达式教程,部分翻译自codeproject的The 30 Minute Regex Tutorial。 由于评论里有过长的URL,所以本页排比较混乱,推荐你到原处...
https://stackoverflow.com/ques... 

Is calculating an MD5 hash less CPU intensive than SHA family functions?

... On my 2012 MacBook Air (Intel Core i5-3427U, 2x 1.8 GHz, 2.8 GHz Turbo), SHA-1 is slightly faster than MD5 (using OpenSSL in 64-bit mode): $ openssl speed md5 sha1 OpenSSL 0.9.8r 8 Feb 2011 The 'numbers' are in 1000s of bytes per ...
https://stackoverflow.com/ques... 

Can someone explain __all__ in Python?

... I'm not sure that if tk were released today (or in 2012, even), the recommended practice would be to use from tk import *. I think the practice is accepted due to inertia, not intentional design. – chepner Nov 6 '19 at 15:36 ...
https://stackoverflow.com/ques... 

Update relationships when saving changes of EF4 POCO objects

...lease take a look and see if it can help http://refactorthis.wordpress.com/2012/12/11/introducing-graphdiff-for-entity-framework-code-first-allowing-automated-updates-of-a-graph-of-detached-entities/ You can go straight to the code here https://github.com/refactorthis/GraphDiff ...
https://stackoverflow.com/ques... 

What's the fastest way to merge/join data.frames in R?

...eVersion("sqldf") # [1] ‘0.4.6.4’ R.version.string # R version 2.15.1 (2012-06-22) Please note that I don't know plyr well so please do check with Hadley before relying on the plyr timings here. Also note that the data.table do include the time to convert to data.table and set the key, for far...
https://stackoverflow.com/ques... 

Should CSS always preceed Javascript?

...of worldwide desktop browser users using this version or greater as of Jan 2012) Chrome 1 (WebKit 525) (100%) IE 8 (75%) Firefox 3.5 (96%) Safari 4 (99%) Opera 11.60 (85%) In total, roughly 85% of desktop browsers in use today support speculative loading. Putting scripts before CSS will have a ...
https://stackoverflow.com/ques... 

lenses, fclabels, data-accessor - which library for structure access and mutation is better

...te-haskell machinery is now available via data-lens-template. Update 6/28/2012: Other Lens Implementation Strategies Isomorphism Lenses There are two other lens encodings worth considering. The first gives a nice theoretical way to view a lens as a way to break a structure into the value of the f...
https://stackoverflow.com/ques... 

What is std::promise?

...nd in most cases I will expect runtimes that use thread pools. Currently VS2012 does use a thread pool under the hood, and it does not violate the as-if rule. Note that there are very little guarantees that need to be fulfilled for this particular as-if. – David Rodríguez - dr...
https://stackoverflow.com/ques... 

Are Exceptions in C++ really slow

...ortunately the report, from 2006, is already a little bit dated as of late 2012, and as far as I know there’s not anything comparable that’s newer. Another important perspective is that the impact of use of exceptions on performance is very different from the isolated efficiency of the supporti...
https://stackoverflow.com/ques... 

Traversing text in Insert mode

...nd clicking to position the cursor (duh) just works. See http://usevim.com/2012/05/16/mouse/ for more on this. And so... These are what I'd call more modern (using mouse, scroll wheel, etc.) ways of navigating in vim, equally effective depending on your preference of input. HTH ...