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Does the APNS device token ever change, once created?
... domain (production vs. sandbox). I believe that this must remain true in order for the system to work reliably. Consider the situation where an application update triggers a new APN token; if I were using the greatest new Twitter-like app, with notifications enabled, what would happen when I upda...
When should I write the keyword 'inline' for a function/method?
...e fun() = 111 in both of the lines.
Case B:
Compile (notice reverse order):
g++ -std=c++11 inline222.cpp inline111.cpp
Output:
inline111: fun() = 222, &fun = 0x402980
inline222: fun() = 222, &fun = 0x402980
Discussion:
This case asserts what have been discussed in Case A.
Noti...
WaitAll vs WhenAll
...lready. I guess I could give an analogy - it's like the difference between ordering a takeaway and then standing by the door waiting for it to arrive, vs ordering a takeaway, doing other stuff and then opening the door when the courier arrives...
– Jon Skeet
De...
How can I determine if a JavaScript variable is defined in a page? [duplicate]
...
To avoid accidental assignment, I make a habit of reversing the order of the conditional expression:
if ('undefined' !== typeof x) {
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JavaScript string encryption and decryption?
...parated parts. You will need to know which components to take (and in what order) to make it work. The rollups files contain everything you need to make it work with just one script reference (much better as the hard job is already done).
– shahar eldad
Oct 23 ...
TSQL - Cast string to integer or return default value
...ng main differences:
My logic does not tolerate occurrences of . or , in order to mimic the behaviour of native INT conversions. '1,234' and '1234.0' return NULL.
Since it does not use local variables, my function can be defined as an inline table-valued function, allowing for better query optimiz...
When should I use the Visitor Design Pattern? [closed]
...virtual void hereIsACat(Cat *c) = 0;
};
Then, we modify the hierarchy in order to accept new operations:
class Animal
{ public: virtual void letsDo(Operation *v) = 0; };
class Dog : public Animal
{ public: void letsDo(Operation *v); };
void Dog::letsDo(Operation *v)
{ v->hereIsADog(this); }
...
Understanding __get__ and __set__ and Python descriptors
..._attrs(property)
set(['__set__', '__get__', '__delete__'])
Dotted Lookup Order
These are important distinctions, as they affect the lookup order for a dotted lookup.
obj_instance.attribute
First the above looks to see if the attribute is a Data-Descriptor on the class of the instance,
If no...
scala vs java, performance and memory? [closed]
...guages Benchmark Game Scala code is written in a rather Java-like style in order to get Java-like performance, and thus has Java-like memory usage. You can do this in Scala: if you write your code to look like high-performance Java code, it will be high-performance Scala code. (You may be able to ...
What is the curiously recurring template pattern (CRTP)?
...
};
template <class T>
T* Singleton<T>::p = nullptr;
Now, in order to make an arbitrary class A a singleton you should do this
class A: public Singleton<A>
{
//Rest of functionality for class A
};
So you see? The singleton template assumes that its specialization for any ty...