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Java's Interface and Haskell's type class: differences and similarities?
...d say that an interface is kind of like a type class SomeInterface t where all of the values have the type t -> whatever (where whatever does not contain t). This is because with the kind of inheritance relationship in Java and similar languages, the method called depends on the type of object th...
How do I squash two non-consecutive commits?
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Initially, I read it as "rebase D onto A, squash D into A, then rebase B onto DA". It's not clear from the answer that this can be done by reordering lines in a text editor.
– Victor Sergienko
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What is the difference between an annotated and unannotated tag?
...you passed the -a flag for annotation and use the provided message.
Basically, it just amounts to whether you want the tag to have an annotation and some other information associated with it or not.
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Calling virtual functions inside constructors
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Calling virtual functions from a constructor or destructor is dangerous and should be avoided whenever possible. All C++ implementations should call the version of the function defined at the level of the hierarchy in the cur...
How to save traceback / sys.exc_info() values in a variable?
...traceback.format_exc()
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>>> print var
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ValueError: invalid literal for int() with base 10: 'k'
You should however take a look at the traceback documentation, as you might find there more suitable metho...
Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?
I'm hoping someone can provide some insight as to what's fundamentally different about the Java Virtual Machine that allows it to implement threads nicely without the need for a Global Interpreter Lock (GIL), while Python necessitates such an evil.
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How to expire session due to inactivity in Django?
...just have to make some urls and views to return relevant data to the ajax calls regarding the session expiry.
when the user opts to "renew" the session, so to speak, all you have to do is set requeset.session['last_activity'] to the current time again
Obviously this code is only a start... but it ...
What is the use of the %n format specifier in C?
...f characters printed thus far to an int variable), but so far no one has really given an example of what use it has. Here is one:
int n;
printf("%s: %nFoo\n", "hello", &n);
printf("%*sBar\n", n, "");
will print:
hello: Foo
Bar
with Foo and Bar aligned. (It's trivial to do that with...
Delete everything in a MongoDB database
I'm doing development on MongoDB. For totally non-evil purposes, I sometimes want to blow away everything in a database—that is, to delete every single collection, and whatever else might be lying around, and start from scratch. Is there a single line of code that will let me do this? Bonus points...
How to copy a directory structure but only include certain files (using windows batch files)
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Really!? I am also using Win 7. When I try, it just doesn't copy any files. Only folders. I'll try again. (while we're at it, what is the syntax to include more than *.zip - let's say *.zip and *.jpg.
– Ni...