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How to recover stashed uncommitted changes
...hat if you're doing more-advanced or more-complicated stuff?
There are at least three or four different "ways to use git stash", as it were. The above is for "way 1", the "easy way":
You started with a clean branch, were working on some changes, and then realized you were doing them in the wrong...
What's wrong with nullable columns in composite primary keys?
...features are required. otoh, the web design crowd doesn't care. I would at least add a note of caution about this instead of making it sound like a good design idea.
– zxq9
Feb 17 '15 at 11:55
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Knight's Shortest Path on Chessboard
...ny of the 24 points in the set S3 (defined similarly) to (x,y) requires at least two moves.
Therefore, if |x1-x0|>4 or |y1-y0|>4, the shortest path from (x0,y0) to (x1,y1) is exactly two moves greater than the shortest path from (x0,y0) to S4. And the latter problem can be solved quickly with...
When to use volatile with multi threading?
...lity or restrictions to what volatile does. For example, in MSVC 2010 (at least) Acquire and Release semantics do apply to certain operations on volatile variables. From the MSDN:
When optimizing, the compiler must maintain ordering among references
to volatile objects as well as references ...
Python extending with - using super() Python 3 vs Python 2
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To clarify a point, I get TypeError: super() takes at least 1 argument (0 given) when trying to call super(self.__class__) in Python 2. (Which doesn't make a lot of sense, but it demonstrates how much information is missing from this answer.)
– jpmc26
...
List all the modules that are part of a python package?
...not part of the "public" interface and are subject to change.
However, at least as of Python 2.6 (and perhaps earlier versions?)
pkgutil comes with a walk_packages method which recursively walks through all the
modules available.
...
How do I find Waldo with Mathematica?
... in each image.
Obtaining enough training examples. SVMs work best with at least 100 examples of each class. Commercial applications of boosting (e.g., the face-focusing in digital cameras) are trained on millions of positive and negative examples.
A quick Google image search turns up some good da...
C/C++ include header file order
... to be self-sufficient, which can only be tested if it's included first at least once
One should not mistakenly modify the meaning of a third-party header by introducing symbols (macro, types, etc.)
So I usually go like this:
// myproject/src/example.cpp
#include "myproject/example.h"
#include &...
Definition of “downstream” and “upstream”
...itory from github, then issue a 'pull request', you most certainly have at least two: origin (your forked repo on github) and upstream (the repo on github you forked from). Those are just interchangeable names, only the 'git@...' url identifies them.
Your .git/configreads :
[remote "origin"...
Why do we need virtual functions in C++?
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@mike - "The term "late binding" dates back to at least the 1960s, where it can be found in Communications of the ACM.". Wouldn't it be nice if there was one correct word for each concept? Unfortunately, it just ain't so. The terms "early binding" and "late binding" predate ...