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What are the differences between “generic” types in C++ and Java?
...is a big difference between them. In C++ you don't have to specify a class or an interface for the generic type. That's why you can create truly generic functions and classes, with the caveat of a looser typing.
template <typename T> T sum(T a, T b) { return a + b; }
The method above adds t...
Instance variable: self vs @
...hings depending on how the age method is implemented in a given subclass. For example, you might have a MiddleAgedSocialite class that always reports its age 10 years younger than it actually is. Or more practically, a PersistentPerson class might lazily read that data from a persistent store, cache...
Why does Popen.communicate() return b'hi\n' instead of 'hi'?
... -n hi", \
shell=True, stdout=subprocess.PIPE).communicate()[0])
As for the b preceding the string it indicates that it is a byte sequence which is equivalent to a normal string in Python 2.6+
http://docs.python.org/3/reference/lexical_analysis.html#literals
...
Can anyone explain python's relative imports?
I can't for the life of me get python's relative imports to work. I have created a simple example of where it does not function:
...
How to properly check if std::function is empty in C++11?
...
You're not checking for an empty lambda, but whether the std::function has a callable target stored in it. The check is well-defined and works because of std::function::operator bool which allows for implicit conversion to bool in contexts where ...
What is DOM Event delegation?
...rs found by
following the EventTarget's parent
chain upward, checking for any event
listeners registered on each
successive EventTarget. This upward
propagation will continue up to and
including the Document.
Event bubbling provides the foundation for event delegation in browsers. Now ...
Progress indicator during pandas operations
I regularly perform pandas operations on data frames in excess of 15 million or so rows and I'd love to have access to a progress indicator for particular operations.
...
I have 2 dates in PHP, how can I run a foreach loop to go through all of those days?
...mDateString('1 day');
$period = new DatePeriod($begin, $interval, $end);
foreach ($period as $dt) {
echo $dt->format("l Y-m-d H:i:s\n");
}
This will output all days in the defined period between $start and $end. If you want to include the 10th, set $end to 11th. You can adjust format to yo...
Read url to string in few lines of java code
...
Now that some time has passed since the original answer was accepted, there's a better approach:
String out = new Scanner(new URL("http://www.google.com").openStream(), "UTF-8").useDelimiter("\\A").next();
If you want a slightly fuller implementation, which is ...
Check if a value is in an array (C#)
... @0A0D. This answer is I think straight best one as simplest/shortest and well known way to achieve same thing (How do I check if a value is in an array in C#?) and efficient as well. No loop no extra method. Just a namespace is extra which is not a big thing.
– Sam...