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Timer function to provide time in nano seconds using C++
I wish to calculate the time it took for an API to return a value.
The time taken for such an action is in the space of nano seconds. As the API is a C++ class/function, I am using the timer.h to caculate the same:
...
What is the best regular expression to check if a string is a valid URL?
...C 3987 (http://www.faqs.org/rfcs/rfc3987.html). These are in PCRE syntax.
For absolute IRIs (internationalized):
/^[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-...
How to show all shared libraries used by executables in Linux?
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Use ldd to list shared libraries for each executable.
Cleanup the output
Sort, compute counts, sort by count
To find the answer for all executables in the "/bin" directory:
find /bin -type f -perm /a+x -exec ldd {} \; \
| grep so \
| sed -e '/^[^\t]/ d' \...
Combining C++ and C - how does #ifdef __cplusplus work?
...s that can't be built with C linkage. That means no classes or templates, for example.
extern "C" blocks nest nicely. There's also extern "C++" if you find yourself hopelessly trapped inside of extern "C" regions, but it isn't such a good idea from a cleanliness perspective.
Now, specifically re...
Why can't I overload constructors in PHP?
...tions of parameters, use the factory pattern with a private constructor.
For example:
public MyClass {
private function __construct() {
...
}
public static function makeNewWithParameterA($paramA) {
$obj = new MyClass();
// other initialization
return $obj...
In Python, how do I indicate I'm overriding a method?
In Java, for example, the @Override annotation not only provides compile-time checking of an override but makes for excellent self-documenting code.
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Python decorators in classes
...on an instance and could do anything to the instance variables it wanted before and after ( or even whether or not ) it called "bar". There is no such thing as instance variables when declaring the class. Did you want to do something to the class from within the decorator? I do not think that is ...
Get event listeners attached to node using addEventListener
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Any chance of supplying some justification or reasoning for why it must work this way? Clearly the browser knows what all of the listeners are.
– Darth Egregious
Apr 5 '12 at 19:23
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Should you always favor xrange() over range()?
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For performance, especially when you're iterating over a large range, xrange() is usually better. However, there are still a few cases why you might prefer range():
In python 3, range() does what xrange() used to do and xr...
How to convert list of tuples to multiple lists?
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franklsf95 goes for performance in his answer and opts for list.append(), but they are not optimal.
Adding list comprehensions, I ended up with the following:
def t1(zs):
xs, ys = zip(*zs)
return xs, ys
def t2(zs):
xs, ys = []...