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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...nt instruction sequences, compiler optimizations enabled by -O2 might benefit average processor, but decrease performance on your particular processor (and the same applies to -Os). If you try the same example on different processors, you will find that on some of them benefit from -O2 while other a...
Is there a way to make GHC provide the type class constraints of typed holes?
It would be nice if GHC would also tell me that the typed hole has the Show type class constraint.
3 Answers
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Access nested dictionary items via a list of keys?
...ure which I would like to access via a list of keys to address the correct item.
18 Answers
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【解决】scrapyd启动job时报错：exceptions.TypeError: __init__() got an ...
【解决】scrapyd启动job时报错：exceptions.TypeError: __init__() got an unexpected keyword argument '_job'进入项目spiders目录, 修改 spider py 文件（你自己的spider的主文件）：def __init__(self):改为：def __init__(self, *args, **kwargs):最后不要忘了重新部署一...
What does #defining WIN32_LEAN_AND_MEAN exclude exactly?
...luding some of the less frequently used APIs". Somewhere else I read that it speeds up the build process.
2 Answers
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How to properly add cross-site request forgery (CSRF) token using PHP
I am trying to add some security to the forms on my website. One of the forms uses AJAX and the other is a straightforward "contact us" form. I'm trying to add a CSRF token. The problem I'm having is that the token is only showing up in the HTML "value" some of the time. The rest of the time, the va...
Dynamic variable names in Bash
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Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g...
How to use the pass statement?
...eached the section about the pass statement. The guide I'm using defines it as being a Null statement that is commonly used as a placeholder.
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Disable button in jQuery
...follow
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edited Sep 17 '14 at 13:37
community wiki
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Named routes _path vs _url
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_path helpers provide a site-root-relative path. You should probably use this most of the time.
_url helpers provide an absolute path, including protocol and server name. I've found that I mainly use these in emails when creating links to the app on...