大约有 15,000 项符合查询结果（耗时：0.0502秒） [XML]
Match multiple cases classes in scala
...C(_) => "B"
case _ => "default"
}
}
If you must, must, must extract the parameter and treat them in the same code block, you could:
def matcher(l: Foo): String = {
l match {
case A() => "A"
case bOrC @ (B(_) | C(_)) => {
val s = bOrC.asInstanceOf[{def s: String}]...
Creating my own Iterators
...ber of templates and concepts to implement new iterators and adapters for existing iterators. I have written an article about this very topic; it's in the December 2008 ACCU magazine. It discusses an (IMO) elegant solution for exactly your problem: exposing member collections from an object, using B...
Aggregate / summarize multiple variables per group (e.g. sum, mean)
From a data frame, is there a easy way to aggregate ( sum , mean , max et c) multiple variables simultaneously?
8 Answer...
String, StringBuffer, and StringBuilder
...ng class because a String object is immutable.
If your string can change (example: lots of logic and operations in the construction of the string) and will only be accessed from a single thread, using a StringBuilder is good enough.
If your string can change, and will be accessed from multiple threa...
What tools are there for functional programming in C?
...
You can use GCC's nested functions to simulate lambda expressions, in fact, I have a macro to do it for me:
#define lambda(return_type, function_body) \
({ \
return_type anon_func_name_ function_body \
anon_func_name_; \
})
Use like this:
int (*max)(int, int) = la...
How do I POST JSON data with cURL?
...e. However, I want to test it with cURL. I am trying to post a JSON data. Example data is like this:
24 Answers
...
How do I loop through a date range?
... you could hit every other day, every third day, only weekdays, etc. For example, to return every third day starting with the "start" date, you could just call AddDays(3) in the loop instead of AddDays(1).
share
|
...
How to make/get a multi size .ico file? [closed]
...e in a cross-platform desktop application (so that, e.g. on Windows, the 16x16 size is used for the app's top bar but a 32x32 size version is used when the various open apps are shown when using Alt-Tab). Once I have that .ico file, I know how to use it within my widget toolkit to get this effect, ...
What is the Scala annotation to ensure a tail recursive function is optimized?
...on of the bytecode, to work out whether a method has been optimised.
Example:
you could add a @tailrec annotation so that you can be sure that your changes have worked.
import scala.annotation.tailrec
class Factorial2 {
def factorial(n: Int): Int = {
@tailrec def factorialAcc(acc: ...
Compare equality between two objects in NUnit
...o the guidelines here: msdn.microsoft.com/en-us/library/336aedhh(VS.80).aspx
– Michael Haren
Nov 25 '08 at 17:50
13
...