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How can i tell if an object has a key value observer attached
...lly, expect the observer's state to go stale as it doesn't receive updates from the formerly-observed object.
If you're doing this in the observing object's class, simply remember which objects you're observing (or, if you only ever observe one object, whether you're observing it). This is assuming...
When should I use “this” in a class?
...od of another object. The third is as a way to call alternate constructors from within a constructor.
Case 1: Using this to disambiguate variable references. In Java setter methods, we commonly pass in an argument with the same name as the private member variable we are attempting to set. We then a...
How do getters and setters work?
I'm from the php world. Could you explain what getters and setters are and could give you some examples?
6 Answers
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Bash script prints “Command Not Found” on empty lines
Every time I run a script using bash scriptname.sh from the command line in Debian, I get Command Not found and then the result of the script.
...
What are copy elision and return value optimization?
...if copying/moving the object has side-effects.
The following example taken from Wikipedia:
struct C {
C() {}
C(const C&) { std::cout << "A copy was made.\n"; }
};
C f() {
return C();
}
int main() {
std::cout << "Hello World!\n";
C obj = f();
}
Depending on the compiler...
Suppress command line output
...0 is stdin, incidentally.) The 2>&1 copies output file descriptor 2 from the new value of 1, which was just redirected to the null device.
This syntax is (loosely) borrowed from many Unix shells, but you do have to be careful because there are subtle differences between the shell syntax and ...
Add an element to an array in Swift
...
anArray+="Foo" does not work anymore from xCode 6 beta 5
– Amitay
Aug 7 '14 at 6:44
...
How to list all installed packages and their versions in Python?
...uce the same output as pip freeze by calling:
pip list
Note
The output from pip list is formatted differently, so if you have some shell script that parses the output (maybe to grab the version number) of freeze and want to change your script to call list, you'll need to change your parsing code...
Convert InputStream to byte array in Java
...write it myself? The jar is only 107KB and if you have need for one method from it, you are likely to use others too
– Rich Seller
Aug 12 '09 at 10:46
246
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How efficient can Meteor be while sharing a huge collection among many clients?
...s.
For example, you can write a publish function that reads a GPS position
from a device inside a Meteor.setInterval, or polls a legacy REST API
from another web service. In those cases, you'd emit changes to the
merge box by calling the low-level added, changed and removed DDP API.
The Mongo driv...