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smart pointers (boost) explained
...o the same object at the same time. If the smart pointer is to be returned from functions, the ownership is transferred to the returned smart pointer, for example.
The third means that multiple smart pointers can point to the same object at the same time. This applies to a raw pointer too, however...
Draw on HTML5 Canvas using a mouse
...ouch events eg. touchmove, touchstart, touchend and then the clientX comes from e.touches["0"].clientX in the findxy() code, haven't thought of an easy way to detect what's being used though, as you can't listen to both events at the same time from what I've tested. I left mouseout as is. It's not p...
Can I safely delete contents of Xcode Derived data folder?
...
Yes, you can delete all files from DerivedData sub-folder (Not DerivedData Folder) directly.
That will not affect your project work. Contents of DerivedData folder is generated during the build time and you can delete them if you want. It's not an issue...
Finding differences between elements of a list
...
You can use itertools.tee and zip to efficiently build the result:
from itertools import tee
# python2 only:
#from itertools import izip as zip
def differences(seq):
iterable, copied = tee(seq)
next(copied)
for x, y in zip(iterable, copied):
yield y - x
Or using iterto...
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...
Pickle or json?
...
Apart from security, JSON has the additional advantage that it makes migrations easy, so you can load data that was saved by an older version of your application. Meanwhile you could have added a field, or replaced a whole sub stru...
How to remove an HTML element using Javascript?
...it the form, handle the submit event on the form instead, and return false from your handler:
HTML:
<form onsubmit="return removeDummy(); ">
<input type="submit" value="Remove DUMMY"/>
</form>
JavaScript:
function removeDummy() {
var elem = document.getElementById('du...
any tool for java object to object mapping? [closed]
... Dozer is a Java Bean to Java Bean
mapper that recursively copies data
from one object to another. Typically,
these Java Beans will be of different
complex types.
Dozer supports simple property
mapping, complex type mapping,
bi-directional mapping,
implicit-explicit mapping, as we...
How to compute the similarity between two text documents?
...learn. In the latter package, computing cosine similarities is as easy as
from sklearn.feature_extraction.text import TfidfVectorizer
documents = [open(f) for f in text_files]
tfidf = TfidfVectorizer().fit_transform(documents)
# no need to normalize, since Vectorizer will return normalized tf-idf
...
Volatile vs. Interlocked vs. lock
...e two CPUs see the same data at the same time. It doesn't stop them at all from interleaving their reads and write operations which is the problem you are trying to avoid.
Second Best:
lock(this.locker) this.counter++;
This is safe to do (provided you remember to lock everywhere else that you acce...