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Why does calling a method in my derived class call the base class method?
...chain, Bak, but resolution at every level of variable type is performed by starting at that level of the inheritance chain and drilling down to the most derived explicit override of the method, which are those in Bar, Bai, and Bat. Method hiding thus "breaks" the overriding inheritance chain; you ha...
CSS media queries: max-width OR max-height
...context of media queries is confusing - but I should tell that to whomever started using that term in the MDN article in the first place. The correct term as of Media Queries 4 is "media condition".
– BoltClock♦
Mar 14 '17 at 15:28
...
std::function and std::bind: what are they, and when should they be used?
...
this, std::placeholders::_1);
//normally you want to start below function on seprate thread,
//but for illustration we will just do simple call
longRunningFunction(callback);
}
};
...
What Makes a Method Thread-safe? What are the rules?
... could have changed its value between this thread setting its value at the start
// of the method and this line reading its value.
number = this.someValue.Length;
return number;
}
}
You should be aware that any parameters passed in to the method which are not either a ...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...QL is now a heck of a lot better at handling them than it was when I first started using it.
These days, a simple join on a properly indexed set of tables is rarely a problem, in performance terms. And if it does give a performance hit, then the use of index hints often solves them.
This is discus...
Is recursion ever faster than looping?
... algorithm and reach a result?
We will establish a hierarchy of concepts, starting from scratch and defining in first place the basic, core concepts, then build second level concepts with those, and so on.
First Concept: Memory cells, storage, State. To do something you need places to store final...
MongoDB Many-to-Many Association
...
This can be achieved with a document which tells the application at the start (1) which roles the user belongs to and (2) where to get information about an event linked to a particular role.
{_id: ObjectID(),
roles: [[“Engineer”, “ObjectId()”],
[“Administrator”, ...
What is “callback hell” and how and why does RX solve it?
...ell can be avoided is to use FRP which is an "enhanced version" of RX.
I started to use FRP recently because I have found a good implementation of it called Sodium ( http://sodium.nz/ ).
A typical code looks like this ( Scala.js ) :
def render: Unit => VdomElement = { _ =>
<.div(
...
javascript: recursive anonymous function?
...Y (f => ([a, b, x]) =>
x === 0 ? a : f ([b, a + b, x - 1]))
// starting with 0 and 1, generate the 7th number in the sequence
console.log (fibonacci ([0, 1, 7]))
// 0 1 1 2 3 5 8 13
But this is bad because it's exposing internal state (counters a and b). It would be nice if we ...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
...he error message is fine Googlable. In case you have no clue, best is to restart from scratch and do not touch any IDE/project configuration defaults. In case you're using Eclipse, you can find instructions in How do I import the javax.servlet API in my Eclipse project?
Testing the servlet individu...