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What REALLY happens when you don't free after malloc?
...d when you're done. Also, database handles should have their transactions committed and then closed when you're done with them. Similarly, if you're using an object oriented language like C++ or Objective C, not freeing an object when you're done with it will mean the destructor will never get cal...
Java: difference between strong/soft/weak/phantom reference
...When an object in memory is reachable only by Weak Reference Objects, it becomes automatically eligible for GC.
Levels of Weakness
Two different levels of weakness can be enlisted: soft and phantom.
A soft Reference Object is basically a weak Reference Object that remains in memory a bit more: n...
How can I color Python logging output?
...ous value, before returning the formatted string (credit to Michael in the comments).
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design a stack such that getMinimum( ) should be O(1)
...re's a solution which doesn't do that though, without wrecking the runtime complexity somewhere (e.g. making push/pop O(n)). Note that this doesn't change the complexity of the space required, e.g. if you've got a stack with O(n) space requirements, this will still be O(n) just with a different cons...
The relationship could not be changed because one or more of the foreign-key properties is non-nulla
... entity and then set the collection of child entities to my new list which comes from the MVC view.
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Hg: How to do a rebase like git's rebase
...working on a new feature:
$ hg clone mainline-repo newfeature-123
do a few commits (M, N, O)
master A---B---C
\
newfeature-123 M---N---O
2. Pull new changes from upstream mainline:
$ hg pull
master A---B---C---D---E---F
\
newfeature-123 M---N---O
3. merge mast...
Wrap a delegate in an IEqualityComparer
Several Linq.Enumerable functions take an IEqualityComparer<T> . Is there a convenient wrapper class that adapts a delegate(T,T)=>bool to implement IEqualityComparer<T> ? It's easy enough to write one (if your ignore problems with defining a correct hashcode), but I'd like to know...
What is Rack middleware?
...include them) is a great help in developing well structured applications.
Community
There's also a great eco-system developing around Rack Middleware - you should be able to find pre-built rack components to do all of the steps above and more. See the Rack GitHub wiki for a list of middleware.
Wh...
Is it necessary to write HEAD, BODY and HTML tags?
... won't ordinarily affect you. So yes, if it matters to your page whether a comment node or white space appears just before the head element or just inside it, (the page's JS could depend on it) then you must explicitly identify the head start tag to make that relationship correct. But if it doesn't,...
How does BLAS get such extreme performance?
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A good starting point is the great book The Science of Programming Matrix Computations by Robert A. van de Geijn and Enrique S. Quintana-Ortí. They provide a free download version.
BLAS is divided into three levels:
Level 1 defines a set of linear algebra functions that operate on vectors only. ...