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How to use concerns in Rails 4
The default Rails 4 project generator now creates the directory "concerns" under controllers and models. I have found some explanations about how to use routing concerns, but nothing about controllers or models.
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be POSIX conform, they have to .
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Why #egg=foo when pip-installing from git repo
...nstall -e ..." to install from a git repo, I have to specify #egg=somename or pip complains. For example:
4 Answers
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Difference between Big-O and Little-O Notation
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f ∈ O(g) says, essentially
For at least one choice of a constant k > 0, you can find a constant a such that the inequality 0 <= f(x) <= k g(x) holds for all x > a.
Note that O(g) is the set of all functions for which this condition holds....
C++ semantics of `static const` vs `const`
In C++ specifically, what are the semantic differences between for example:
2 Answers
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Pure virtual destructor in C++
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Yes. You also need to implement the destructor:
class A {
public:
virtual ~A() = 0;
};
inline A::~A() { }
should suffice.
And since this got a down vote, I should clarify: If you derive anything from A and then try to delete or destroy it, A's destructor will ...
Capture screenshot of active window?
...ndow, and save it
sc.CaptureWindowToFile(this.Handle,"C:\\temp2.gif",ImageFormat.Gif);
http://www.developerfusion.com/code/4630/capture-a-screen-shot/
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What does in XML mean?
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CDATA stands for Character Data and it means that the data in between these strings includes data that could be interpreted as XML markup, but should not be.
The key differences between CDATA and comments are:
As Richard points out, CDA...
Validation failed for one or more entities. See 'EntityValidationErrors' property for more details [
I am having this error when seeding my database with code first approach.
29 Answers
2...
Overloading and overriding
... getStuff(int id)
{
//base.getStuff(id);
//or - Get stuff new location
}
}
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