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Equivalent C++ to Python generator pattern
... State { unsigned i, j; };
State make();
void next(State&);
bool isDone(State const&);
Of course, we wrap this as a proper class:
class PairSequence:
// (implicit aliases)
public std::iterator<
std::input_iterator_tag,
std::pair<unsigned, unsigned>
...
Getting the application's directory from a WPF application
...
One method:
System.AppDomain.CurrentDomain.BaseDirectory
Another way to do it would be:
System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName)
...
Convert array of strings into a string in Java
...For small arrays you might not really notice the difference, but for large ones it can be orders of magnitude slower.
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How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...mlHttpRequest (on any tab) to the same domain is fired, it is queued until one of the other 6 finish.
8 Answers
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Use JNI instead of JNA to call native code?
...d a jni wrapper
If you need a lot of memory copying. For example, you call one method which returns you a large byte buffer, you change something in it, then you need to call another method which uses this byte buffer. This would require you to copy this buffer from c to java, then copy it back from...
Update value of a nested dictionary of varying depth
...idea, i.e. a recursive solution, but somewhat peculiar coding and at least one bug. I'd recommend, instead:
Python 2:
import collections
def update(d, u):
for k, v in u.iteritems():
if isinstance(v, collections.Mapping):
d[k] = update(d.get(k, {}), v)
else:
...
What are dictionary view objects?
... as well. This feature can be useful in some circumstances (for instance, one can work with a view on the keys in multiple parts of a program instead of recalculating the current list of keys each time they are needed)—note that if the dictionary keys are modified while iterating over the view, h...
How do I prevent site scraping? [closed]
...ownload pages, and Grep (Regex) to extract the data.
HTML parsers, such as ones based on Jsoup, Scrapy, and others. Similar to shell-script regex based ones, these work by extracting data from pages based on patterns in HTML, usually ignoring everything else.
For example: If your website has a sea...
Casting vs using the 'as' keyword in the CLR
...n. That throws an exception immediately, which means that no more work is done under incorrect assumptions, and the exception correctly shows the type of bug.
// This will throw an exception if randomObject is non-null and
// refers to an object of an incompatible type. The cast is
// the best code...
difference between throw and throw new Exception()
... "throw new Exception(ex); is even worse.": I disagree on this one. Sometimes you want to change the type of an exception, and then keeping the original exception as inner exception is the best you can do. Though it should be throw new MyCustomException(myMessage, ex); of course.
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