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Detecting 'stealth' web-crawlers
...lenty of tricks with comments, CDATA elements, entities, etc:
<a href="foo<!--bar-->"> (comment should not be removed)
<script>var haha = '<a href="bot">'</script>
<script>// <!-- </script> <!--><a href="bot"> <!-->
...
What is a “static” function in C?
...aces are preferred for this usage.
// inside some .cpp file:
static void foo(); // old "C" way of having internal linkage
// C++ way:
namespace
{
void this_function_has_internal_linkage()
{
// ...
}
}
The second usage is in the context of a class. If a class has a static membe...
Why am I seeing “TypeError: string indices must be integers”?
...gh a Pandas dataset Pandas documentation for iterrows
data = pd.read_csv('foo.csv')
for index,item in data.iterrows():
print('{} {}'.format(item["gravatar_id"], item["position"]))
note that you need to handle the index in the dataset that is also returned by the function.
...
Check for array not empty: any?
... def size?
respond_to?(:size) && size > 0
end
end
> "foo".size?
=> true
> "".size?
=> false
> " ".size?
=> true
> [].size?
=> false
> [11,22].size?
=> true
> [nil].size?
=> true
This is fairly descriptive, logically asking "does this obj...
#include in .h or .c / .cpp?
... In other cases yes, you can forward declare incomplete types like struct foo; or class bar; and not include the header file, but now you've increased your maintenance burden. You have to keep your forward declarations in sync with what's in the header file - it's just easier to include the header...
How do I upload a file with metadata using a REST web service?
...e request... also, what prevents you from just writing curl -f 'metadata={"foo": "bar"}'?
– Erik Kaplun
Apr 2 '15 at 15:18
...
General guidelines to avoid memory leaks in C++ [closed]
...g scope is finished. This is common with PostThreadMessage in Win32:
void foo()
{
boost::shared_ptr<Object> obj(new Object());
// Simplified here
PostThreadMessage(...., (LPARAM)ob.get());
// Destructor destroys! pointer sent to PostThreadMessage is invalid! Zohnoes!
}
As alwa...
What is pluginManagement in Maven's pom.xml?
...ation like:
<plugins>
<plugin>
<groupId>com.foo</groupId>
<artifactId>bar-plugin</artifactId>
</plugin>
</plugins>
Notice how you aren't defining any configuration. You can inherit it from the parent, unless you need to furth...
Change working directory in my current shell context when running Node script
..., but for one, imagine that you executed a script in the background (via ./foo.js &) and as it ran, it started changing your working directory or overriding your PATH. That would be a nightmare.
If you need to perform some actions that require changing your working directory of your shell, you'...
Creating temporary files in bash
...s input to another command, e.g.:
$ diff <(echo hello world) <(echo foo bar)
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