tomersh’s clever one-file hack that simulates Generics in ObjC<\/a>. It creates @protocol’s that extend NSSet\/NSArray\/etc to behave like Generics (but only for simple operations) — and because @protocol uses the same <\/> syntax as Generics, it even reads the same!<\/p>\nReducing boilerplate code typing, even without Generics<\/h3>\n
Artemis has ComponentMapper’s. In Java, using Generics, these automatically output the correct type for each object. In ObjC, you have to type some horrors like:<\/p>\n
[objc]
\n\tComponentOrder* order = (ComponentOrder*) [self.mapOrders get:entity];
\n\tif( ((ComponentOwnedResource*)[self.mapOwnedResource get:[entity.world getEntity:order.sourceCountryEID]]).ownerEID != order.playerEID )
\n\t{<\/p>\n
\t}
\n[\/objc]<\/p>\n
…because of ObjC’s lack of Generics, there’s so much crud there it’s almost impossible to read WTF the programmer was doing. In OOP it would have been:<\/p>\n
[objc]
\n\tif( order.sourceCountry.ownerEID != order.playerEID )
\n\t{<\/p>\n
\t}
\n[\/objc]<\/p>\n
This is a disaster! The ES code is literally 3 times as much typing as the OOP code, AND IT HAS NO TYPESAFETY! The worst of all worlds<\/span><\/p>\nSo, I added subscripting (a relatively recent ObjC feature) to ArtemisComponentMapper. The new code is:<\/p>\n
[objc]
\n\tComponentOrder* order = (ComponentOrder*) self.mapOrders[entity];
\n\tif( ((ComponentOwnedResource*)self.mapOwnedResource[ order.sourceCountryEID]).ownerEID != order.playerEID )
\n\t{<\/p>\n
\t}
\n[\/objc]<\/p>\n
Note:<\/strong> “self.mapOwnedResource” is an ArtemisComponentMapper. In traditional Artemis, you have to pass it an Entity instance (ObjC: ArtemisEntity*). But in cases where you had only the “id” (ObjC: Id), you need to first fetch the Entity.<\/p>\n…with subscripting, you can have TWO subscripts: one that uses int’s, one that uses NSObject*’s. Conveniently, that means you can use EITHER the raw id (which is an int! Very lucky!), or the Entity instance … and the library now intelligently does the right thing.<\/p>\n
More to come…<\/h2>\n
If you contribute to the project and add fixes\/improvements, let me know and I’ll add info here…<\/p>\n","protected":false},"excerpt":{"rendered":"
I wanted to try the latest version of Artemis, and I had an old game project that was quickly written in OOP style. So I went looking for an ObjC port… Existing port: outdated There was a port linked on the Artemis site that was OK – but had no documentation or updates, and Artemis […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[60,20],"tags":[],"_links":{"self":[{"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/posts\/3062"}],"collection":[{"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/comments?post=3062"}],"version-history":[{"count":8,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/posts\/3062\/revisions"}],"predecessor-version":[{"id":3109,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/posts\/3062\/revisions\/3109"}],"wp:attachment":[{"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/media?parent=3062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/categories?post=3062"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/new.t-machine.org\/index.php\/wp-json\/wp\/v2\/tags?post=3062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}