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When do I use a dot, arrow, or double colon to refer to members of a class in C++?
...rloads operator-> (common such types are smart pointers and iterators), then the meaning is whatever the class designer implemented. To conclude: With a->b, if a is a pointer, b will be a member of the object the pointer a refers to. If, however, a is an object of a class that overloads this o...
Why aren't python nested functions called closures?
...for the printer function as a constant and the value of msg as a local. It then creates and returns the function. Because the function printer references the msg variable, it is kept alive after the make_printer function has returned.
So, if your nested functions don't
access variables that are...
What is the difference between sigaction and signal?
...
@BulatM. If you can't use sigaction(), then you're essentially obliged to use the Standard C specification for signal(). However, that gives you an extremely impoverished set of options for what you can do. You can: modify (file scope) variables of type volatile s...
what exactly is device pixel ratio?
...s get higher resolutions, if every device still had a CSS pixel ratio of 1 then webpages would render too small to see.
A typical full screen desktop monitor is a roughly 24" at 1920x1080 resolution. Imagine if that monitor was shrunk down to about 5" but had the same resolution. Viewing things on ...
What is the difference between partitioning and bucketing a table in Hive ?
..., month STRING, day STRING)
CLUSTERED BY (employee_id) INTO 256 BUCKETS
then hive will store data in a directory hierarchy like
/user/hive/warehouse/mytable/y=2015/m=12/d=02
So, you have to be careful when partitioning, because if you for instance partition by employee_id and you have millions...
How to “warm-up” Entity Framework? When does it get “cold”?
...ll take place when you build your model assembly. Your context object will then skip the "cold query" and stay responsive for the duration of the context object life cycle as well as subsequent new object contexts.
Executing irrelevant queries will serve no other purpose than to consume system reso...
Using HTML5/Canvas/JavaScript to take in-browser screenshots
...ub this weekend,still some minor clean ups and changes I want to do before then, as well as get rid of the unnecessary jQuery dependancy it currently has.
– Niklas
Jul 15 '11 at 19:43
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Local Storage vs Cookies
...data — the client or the server?
If it's your client (your JavaScript), then by all means switch. You're wasting bandwidth by sending all the data in each HTTP header.
If it's your server, local storage isn't so useful because you'd have to forward the data along somehow (with Ajax or hidden for...
What is the difference between class and instance attributes?
...
However, note that if you do a.foo = 5, then in both cases you will see b.foo return []. That is because in the first case, you are overwriting the class attribute a.foo with a new instance attribute of the same name.
– Konstantin Schubert
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How to play a local video with Swift?
...hecking your video is into the Bundle
Open the Project Navigator cmd + 1
Then select your project root > your Target > Build Phases > Copy Bundle Resources.
Your video MUST be here. If it's not, then you should add it using the plus button
3. Code
Open your View Controller and write ...