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When to use volatile with multi threading?
...+ standard even talks about "read-read coherence", "write-read coherence", etc. One note in the standard even points the connection to hardware:
http://eel.is/c++draft/intro.races#19
[ Note: The four preceding coherence requirements effectively disallow compiler reordering of atomic operati...
Bootstrap 3 Slide in Menu / Navbar on Mobile [closed]
...for my own project and I'm sharing it this way. Any support, further help, etc., is up to each individual.
– Christina
Jan 1 '14 at 22:57
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How do I achieve the theoretical maximum of 4 FLOPs per cycle?
...s happen in parallel, the cpu may be in a low frequency power saving mode, etc. Running the program repeatedly gives you a result that is closer to the ideal case.
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Ship an application with a database
...savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DatabaseHelper myDbHelper;
SQLiteDatabase myDb = null;
myDbHelper = new DatabaseHelper(this);
/*
* Database must be initialized before it can be used. Th...
Maximum single-sell profit
...e problem for the first element, then the first two, then the first three, etc. until we'd computed it for the first n elements.
Let's think about how to do this. If we have just one element, we already know that it has to be the best buy/sell pair. Now suppose we know the best answer for the fir...
What are the underlying data structures used for Redis?
...p List. Hashes are flattened into a list like [key1, value1, key2, value2] etc.
With Zip Lists you have the power to make a tradeoff between CPU and Memory. Zip Lists are memory-efficient, but they use more CPU than a linked list (or Hash table/Skip List). Finding an element in the zip list is O(n)...
What are metaclasses in Python?
...relying on introspection, manipulating inheritance, vars such as __dict__, etc.
Indeed, metaclasses are especially useful to do black magic, and therefore
complicated stuff. But by themselves, they are simple:
intercept a class creation
modify the class
return the modified class
Why would you use ...
ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides
...lection from below in WPF UI-related work, such as binding it to a ListBox etc. (you can still use the ObservableRangeCollection<T> if not bound to UI).
However you can use the WpfObservableRangeCollection<T> workaround.
The real solution would be creating a CollectionView that knows how...
Git and Mercurial - Compare and Contrast
...refs residing in refs/tags/ namespace, and by default are autofollowed on fetching and require explicit pushing.
Branches: In Mercurial basic workflow is based on anonymous heads; Git uses lightweight named branches, and has special kind of branches (remote-tracking branches) that follow branches in...
How to make a chain of function decorators?
...idon!
Python itself provides several decorators: property, staticmethod, etc.
Django uses decorators to manage caching and view permissions.
Twisted to fake inlining asynchronous functions calls.
This really is a large playground.
...