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Why have header files and .cpp files? [closed]
...ependencies so that code that uses the header doesn't necessarily need to know all the details of the implementation and any other classes/headers needed only for that. This will reduce compilation times and also the amount of recompilation needed when something in the implementation changes.
It's ...
Simple Digit Recognition OCR in OpenCV-Python
... letter_recognition.data file that comes with OpenCV samples. I wanted to know what is inside that file.
It contains a letter, along with 16 features of that letter.
And this SOF helped me to find it. These 16 features are explained in the paperLetter Recognition Using Holland-Style Adaptive Class...
Why don't they teach these things in school? [closed]
...e, despite recent advancements in materials science, civil engineers have known for about 2000 years how to build an arch that won't fall over, and this is something that can be taught and learned in university with relatively little controversy. Although I completely agree with you about the techn...
Node.js Best Practice Exception Handling
...
Update: Joyent now has their own guide. The following information is more of a summary:
Safely "throwing" errors
Ideally we'd like to avoid uncaught errors as much as possible, as such, instead of literally throwing the error, we can inst...
Short description of the scoping rules?
...ning to it will lead to unpredicted and hard to debug issues if you don't know what you're doing.
– Ctrl-C
Jan 21 '14 at 2:19
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Casperjs/PhantomJs vs Selenium
...Recently we have seen majority of our users using Chrome. So we wanted to know - pros and cons of using PhantomJS vs Selenium:
...
Why would iterating over a List be faster than indexing through it?
... item2 -> print item2 etc.
all in a single traversal, which is O(N).
Now, going to the other implementation of List which is ArrayList, that one is backed by a simple array. In that case both of the above traversals are equivalent, since an array is contiguous so it allows random jumps to arbi...
Elastic search, multiple indexes vs one index and types for different data sets?
...e an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure.
...
What's “requestCode” used for on PendingIntent?
... No, It is not necessary for different intents. And I don't know why the documentation doesn't say anything about it, but I learnt this when setting repeating alarms and also when using the same intent.
– Minhaj Arfin
Feb 3 '14 at 12:46
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When does invoking a member function on a null instance result in undefined behavior?
...d a weak "use a dereferenced null pointer, get undefined behavior" view.
Now we consider the question.
Yes, (a) results in undefined behavior. In fact, if this is null then regardless of the contents of the function the result is undefined.
This follows from §5.2.5/3:
If E1 has the type ...