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What Every Programmer Should Know About Memory?
...y fast, but page-splits still hurt (much less on Skylake, though; only ~11 extra cycles latency vs. 100, but still a throughput penalty).
As Ulrich predicted, every multi-socket system is NUMA these days: integrated memory controllers are standard, i.e. there is no external Northbridge. But SMP ...
Best way to add Activity to an Android project in Eclipse?
... a "changes to be performed" list. In this list you can see manifest file, strings.xml etc already checked. So, unless you uncheck them, it is added automatically
– berkuqo
Aug 16 '12 at 8:55
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Python, remove all non-alphabet chars from string
...I have found this post Stripping everything but alphanumeric chars from a string in Python which shows a nice solution using regex, but I am not sure how to implement it
...
List of Rails Model Types
...
:binary
:boolean
:date
:datetime
:decimal
:float
:integer
:primary_key
:string
:text
:time
:timestamp
These are documented under column in the Active Record API.
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What is the use of interface constants?
....
Use of Enum Constants is actually Horrible Practice.
It requires writing extra code to map parameter to value. The fact that the founders of Java did not provide for parameter-value mapping without your writing that mapping code demonstrates Enum Constants are just as unintended use of Java langua...
How to get Locale from its String representation in Java?
... Locale instance from its "programmatic name" as returned by Locale's toString() method? An obvious and ugly solution would be parsing the String and then constructing a new Locale instance according to that, but maybe there's a better way / ready solution for that?
...
Is Java “pass-by-reference” or “pass-by-value”?
... easily confuse many beginners.
It goes like this:
public static void main(String[] args) {
Dog aDog = new Dog("Max");
Dog oldDog = aDog;
// we pass the object to foo
foo(aDog);
// aDog variable is still pointing to the "Max" dog when foo(...) returns
aDog.getName().equals("...
What is the difference between typeof and instanceof and when should one be used vs. the other?
...f ClassSecond; // false
Use typeof for simple built in types:
'example string' instanceof String; // false
typeof 'example string' == 'string'; // true
'example string' instanceof Object; // false
typeof 'example string' == 'object'; // false
true instanceof Boolean; // false
typeof true == 'b...
Set Django IntegerField by choices=… name
...
FWIW, if you need set it from a literal string (perhaps from a form, user input, or similar) you can then just do: thing.priority = getattr(thing, strvalue.upper()).
– mrooney
Feb 24 '13 at 23:22
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RAII and smart pointers in C++
...ance (and stealing an example from another answer):
void foo() {
std::string str;
// Do cool things to or using str
}
This works fine - but what if we want to return str? We could write this:
std::string foo() {
std::string str;
// Do cool things to or using str
return str;
}...