How to get the name of enumeration value in Swift? -

-

if have enumeration raw integer values:

enum city: int {   case melbourne = 1, chelyabinsk, bursa }  let city = city.melbourne

how can convert city value string melbourne? kind of type name introspection available in language?

something (this code not work):

println("your city \(city.magicfunction)") > city melbourne

as of xcode 7 beta 5 can print type names , enum cases default using print(_:), or convert string using string's init(_:) initializer or string interpolation syntax. example:

enum city: int {     case melbourne = 1, chelyabinsk, bursa } let city = city.melbourne  print(city) // prints "melbourne"  let cityname = "\(city)"   // or `let cityname = string(city)` // cityname contains "melbourne"

so there no longer need define & maintain convenience function switches on each case return string literal. in addition, works automatically enum, if no raw-value type specified.

debugprint(_:) & string(reflecting:) can used fully-qualified name:

debugprint(city) // prints "app.city.melbourne" (or similar, depending on full scope)  let citydebugname = string(reflecting: city) // citydebugname contains "app.city.melbourne"

note can customise printed in each of these scenarios:

extension city: customstringconvertible {     var description: string {         return "city \(rawvalue)"     } }  print(city) // prints "city 1"  extension city: customdebugstringconvertible {     var debugdescription: string {         return "city (rawvalue: \(rawvalue))"     } }  debugprint(city) // prints "city (rawvalue: 1)"

(i haven't found way call "default" value, example, print "the city melbourne" without resorting switch statement. using \(self) in implementation of description/debugdescription causes infinite recursion.)


comments above string's init(_:) & init(reflecting:) initializers describe printed, depending on reflected type conforms to:

extension string {     /// initialize `self` textual representation of `instance`.     ///     /// * if `t` conforms `streamable`, result obtained     ///   calling `instance.writeto(s)` on empty string s.     /// * otherwise, if `t` conforms `customstringconvertible`,     ///   result `instance`'s `description`     /// * otherwise, if `t` conforms `customdebugstringconvertible`,     ///   result `instance`'s `debugdescription`     /// * otherwise, unspecified result supplied automatically     ///   swift standard library.     ///     /// - seealso: `string.init<t>(reflecting: t)`     public init<t>(_ instance: t)      /// initialize `self` detailed textual representation of     /// `subject`, suitable debugging.     ///     /// * if `t` conforms `customdebugstringconvertible`, result     ///   `subject`'s `debugdescription`.     ///     /// * otherwise, if `t` conforms `customstringconvertible`, result     ///   `subject`'s `description`.     ///     /// * otherwise, if `t` conforms `streamable`, result     ///   obtained calling `subject.writeto(s)` on empty string s.     ///     /// * otherwise, unspecified result supplied automatically     ///   swift standard library.     ///     /// - seealso: `string.init<t>(t)`     public init<t>(reflecting subject: t) }


see release notes info change.


Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more