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Throwing exceptions from constructors
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Not really, in this specific case, note that his Mutex destructor will never be called, possibly leaking the pthread mutex. The solution to that is to use a smart pointer for the pthread mutex, better yet use boost mutexes or std::mutex, no reason t...
How to create a zip archive of a directory in Python?
... for file in files:
ziph.write(os.path.join(root, file))
if __name__ == '__main__':
zipf = zipfile.ZipFile('Python.zip', 'w', zipfile.ZIP_DEFLATED)
zipdir('tmp/', zipf)
zipf.close()
Adapted from: http://www.devshed.com/c/a/Python/Python-UnZipped/
...
Android onCreate or onStartCommand for starting service
...alled once per instantiated object.
You only need to implement onCreate() if you actually want/need to initialize something only once.
onStartCommand() is called every time a client starts the service using startService(Intent intent). This means that onStartCommand() can get called multiple times...
Why does MYSQL higher LIMIT offset slow the query down?
...The query cannot go right to OFFSET because, first, the records can be of different length, and, second, there can be gaps from deleted records. It needs to check and count each record on its way.
Assuming that id is a PRIMARY KEY of a MyISAM table, you can speed it up by using this trick:
SELECT ...
Constructor in an Interface?
...n a class are defined for
every implementation of this interface."
"If a define a Interface for this class so that I can have more
classes which implement the message interface, I can only define the
send method and not the constructor"
...these requirements are exactly what abstract cl...
An algorithm for inflating/deflating (offsetting, buffering) polygons
... For anyone that wants to do this, another alternative is to use GEOS, and if your using python, GEOS's wrapper, Shapely. A really pretty example: toblerity.github.com/shapely/manual.html#object.buffer
– pelson
Oct 3 '12 at 8:04
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How to get duplicate items from a list using LINQ? [duplicate]
...ny(grp => grp.Skip(1));
Note that this will return all duplicates, so if you only want to know which items are duplicated in the source list, you could apply Distinct to the resulting sequence or use the solution given by Mark Byers.
...
htaccess Access-Control-Allow-Origin
...
Try this in the .htaccess of the external root folder :
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
And if it only concerns .js scripts you should wrap the above code inside this:
<FilesMatch "\.(js)$">
...
</FilesMatch&g...
How can I split a string into segments of n characters?
...d".match(/.{1,3}/g)); // ["abc", "d"]
A couple more subtleties:
If your string may contain newlines (which you want to count as a character rather than splitting the string), then the . won't capture those. Use /[\s\S]{1,3}/ instead. (Thanks @Mike).
If your string is empty, then match() w...
android on Text Change Listener
...nly clear when the text in the field is not empty (i.e when the length is different than 0).
field1.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {}
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, i...