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How does deriving work in Haskell?
... to integrate a new generic deriving mechanism as described in this paper: http://www.dreixel.net/research/pdf/gdmh.pdf
For more on this, see:
GHC wiki: http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/GenericDeriving
Haskell wiki: http://www.haskell.org/haskellwiki/Generics
Hackage: ...
List of installed gems?
...chments."
# s.email = "david@loudthinking.com"
# s.homepage = "http://www.rubyonrails.org"
# s.licenses = ["MIT"]
# s.name = "actionmailer"
# s.require_paths = ["lib"]
# s.required_ruby_version = Gem::Requirement.new([">= 1.9.3"])
# s.requirements = ["non...
How to validate an OAuth 2.0 access token for a resource server?
...come up with one such approach for our commercial OAuth AS (PingFederate): https://support.pingidentity.com/s/document-item?bundleId=pingfederate-93&topicId=lzn1564003025072.html#lzn1564003025072__section_N10578_N1002A_N10001. It uses REST based interaction for this that is very complementary t...
How to list files in a directory in a C program?
...);
}
Beware that such an operation is platform dependant in C.
Source : http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1046380353&id=1044780608
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Detect if stdin is a terminal or pipe?
...n is open source, so you can just look at what they do and know for sure:
http://www.python.org/ftp/python/2.6.2/Python-2.6.2.tar.bz2
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How to write string literals in python without having to escape them?
...
You will find Python's string literal documentation here:
http://docs.python.org/tutorial/introduction.html#strings
and here:
http://docs.python.org/reference/lexical_analysis.html#literals
The simplest example would be using the 'r' prefix:
ss = r'Hello\nWorld'
print(ss)
Hello\...
'printf' vs. 'cout' in C++
...d, while int64_t will require using %"PRId64". The tables are available at http://en.cppreference.com/w/cpp/io/c/fprintf and http://en.cppreference.com/w/cpp/types/integer.
You can't print the NUL byte, \0
Because printf uses C strings as opposed to C++ strings, it cannot print NUL byte without sp...
Web scraping with Python [closed]
...p4:
# from bs4 import BeautifulSoup
soup = BeautifulSoup(urllib2.urlopen('http://example.com').read())
for row in soup('table', {'class': 'spad'})[0].tbody('tr'):
tds = row('td')
print tds[0].string, tds[1].string
# will print date and sunrise
...
400 vs 422 response to POST of data
...
400 Bad Request would now seem to be the best HTTP/1.1 status code for your use case.
At the time of your question (and my original answer), RFC 7231 was not a thing; at which point I objected to 400 Bad Request because RFC 2616 said (with emphasis mine):
The reques...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...：处理无打分的偏好数据。
相似度算法介绍，摘自：http://www.cnblogs.com/dlts26/archive/2012/06/20/2555772.html
5. 近邻算法工具集
近邻算法只对于UserCF适用，通过近邻算法给相似的用户进行排序，选出前N个最相似的，作为最终推荐的...