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How do you access command line arguments in Swift?
...n CommandLine.arguments {
switch argument {
case "arg1":
print("first argument")
case "arg2":
print("second argument")
default:
print("an argument")
}
}
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How to test equality of Swift enums with associated values
...
Swift 4.1+
As @jedwidz has helpfully pointed out, from Swift 4.1 (due to SE-0185, Swift also supports synthesizing Equatable and Hashable for enums with associated values.
So if you're on Swift 4.1 or newer, the following will automatically synthesize the necessa...
What difference is there between WebClient and HTTPWebRequest classes in .NET?
...ebRequest. Normally, you would use WebRequest to, well, make a request and convert the return to either HttpWebRequest, FileWebRequest or FtpWebRequest, depend on your request. Below is an example:
Example:
var _request = (HttpWebRequest)WebRequest.Create("http://stackverflow.com");
var _response ...
C/C++ Struct vs Class
...o fake some OOP in C—for instance, defining functions which all take a pointer to a struct as their first parameter, or occasionally coercing structs with the same first few fields to be "sub/superclasses"—it's always sort of bolted on, and isn't really part of the language.
...
Why isn't std::initializer_list a language built-in?
...ed in the std namespace. typeid returns std::type_info and (stretching a point perhaps) sizeof returns std::size_t.
In the former case, you already need to include a standard header in order to use this so-called "core language" feature.
Now, for initializer lists it happens that no keyword is nee...
How can I extend typed Arrays in Swift?
... For example, sorting a typed array:
class HighScoreEntry {
let score:Int
}
extension Array where Element == HighScoreEntry {
func sort() -> [HighScoreEntry] {
return sort { $0.score < $1.score }
}
}
Trying to do this with a struct or typealias will give an error:
Type '...
How to add multiple columns to a table in Postgres?
...
Try this :
ALTER TABLE table ADD COLUMN col1 int, ADD COLUMN col2 int;
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How to increase the Java stack size?
... static void main(String[] args) {
try {
System.out.println(fact(1 << 15));
}
catch (StackOverflowError e) {
System.err.println("true recursion level was " + level);
System.err.println("reported recursion level was " +
...
Can gcc output C code after preprocessing?
...o have in mind:
gcc -save-temps -c -o main.o main.c
main.c
#define INC 1
int myfunc(int i) {
return i + INC;
}
and now, besides the normal output main.o, the current working directory also contains the following files:
main.i is the desired prepossessed file containing:
# 1 "main.c"
# 1 "<...
String.IsNullOrWhiteSpace in LINQ Expression
...sitor = new QueryVisitor();
return queryable.Where(visitor.VisitAndConvert(where, "WhereEx"));
}
}
So if you run myqueryable.WhereEx(c=> !c.Name.IsNullOrWhiteSpace()) it will be converted to !(c.Name == null || x.Trim() == "") before being passes to whatever (linq to sql/entities) a...