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Covariance and contravariance real world example
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Let's say you have a class Person and a class that derives from it, Teacher. You have some operations that take an IEnumerable<Person> as the argument. In your School class you have a method that returns an IEnumerable<Teacher>. Covariance allows you to directly use th...
Why doesn't RecyclerView have onItemClickListener()?
...iewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_layout, parent, false);
MyAdapter.ViewHolder vh = new ViewHolder(v, new MyAdapter.ViewHolder.IMyViewHolderClicks() {
public void onPotato(View caller) { Log.d(...
Message Queue vs Message Bus — what are the differences?
... BUS vs. QUEUE is indeed somewhat a legacy concept, most recently stemming from systems like IBM MQ and Tibco Rendezvous. MQ was originally a 1:1 system, indeed a queue to decouple various systems.
Tibco by contrast was (sold as a) messaging backbone, where you could have multiple publishers and s...
Javascript calculate the day of the year (1 - 366)
How do I use javascript to calculate the day of the year, from 1 - 366? For example:
22 Answers
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Workflow for statistical analysis and report writing
... in all the data required. Typically this is a short file, reading in data from files, URLs and/or ODBC. Depending on the project at this point I'll either write out the workspace using save() or just keep things in memory for the next step.
clean.R: This is where all the ugly stuff lives - taking ...
How do you copy the contents of an array to a std::vector in C++ without looping?
I have an array of values that is passed to my function from a different part of the program that I need to store for later processing. Since I don't know how many times my function will be called before it is time to process the data, I need a dynamic storage structure, so I chose a std::vector ....
Superiority of unnamed namespace over static?
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You're basically referring to the section §7.3.1.1/2 from the C++03 Standard,
The use of the static keyword is
deprecated when declaring objects in a
namespace scope; the
unnamed-namespace provides a superior
alternative.
Note that this paragraph was already remov...
Greedy vs. Reluctant vs. Possessive Quantifiers
...lementation details at this level.)
So the matcher
slowly backs off (from right-to-left?) one letter at a time
until the rightmost occurrence of
"foo" has been regurgitated (what does this mean?), at which
This means the foo had tentatively been including when matching .*. Because that a...
How to analyze a java thread dump?
... explains what that waiting on means:
A lock prevents more than one entity from accessing a shared resource. Each object in Java™ has an associated lock (gained by using a synchronized block or method). In the case of the JVM, threads compete for various resources in the JVM and locks on Java obje...
How to get all possible combinations of a list’s elements?
...s.combinations(iterable, r)
Return r length subsequences of elements from
the input iterable.
Combinations are emitted in lexicographic sort order. So, if the
input iterable is sorted, the
combination tuples will be produced in
sorted order.
Since 2.6, batteries are included!
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