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Swift 周報 4/12
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Johnlin
April 12, 2016
Programming
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Swift 周報 4/12
Swift 周報 4/12
Johnlin
April 12, 2016
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Transcript
Swift पใ 4/12 John Lin @johnlinvc
From the core • inliner ࠷ՂԽᩋࣥߦ䈕େখݮগ
inliner ࠷ՂԽᩋࣥߦ䈕େখݮগ • ࠷ՂԽ inliner ԋࢉ๏ᩋࣥߦ䈕େখݮগ • stdlib: 3% •
Benchmarks_O: 9% • ၷݸେఔࣜ: 15%, 20%
Evolution • SE-0042 ἷฏԽ instance method references తܕผ • SE-0043
ࡏ༗ଟݸpatterns త case label தએࠂᏓ Ꮠ • SE-0044 Import C function ᗣ swift function • SE-0047 ༬ઃܯࠂᔒ༗༻౸తճၚᆴ
ἷฏԽ instance method references తܕผ • ݱࡏ class Foo {
func foo(bar:Int) { print(bar) } } Foo.foo(Foo())(3) // 3 • ະိ Foo.foo(Foo(),3) // 3
ࡏ༗ଟݸpatterns త case label தએࠂᏓᏐ • Լ໘Ҏޙ။ಈ let point =
(2,2) switch point { case let (1,x), let (2,x): //error print(x) default: break }
Import C function ᗣ swift function • ݱࡏimport C function
ޙ။Ꮣglobal function • ະိՄҎࢦఆimport ਐိޙతҐஔɼबੋՄҎࢦఆC function ᗣ init, method, computed property, static property, static computed property ҃ੋ subscript • ༻ __attribute__((swift_name(“SWIFT_NAME")));
Import C function ᗣ swift function // Import as init
struct Point3D createPoint3D(float x, float y, float z) __attribute__((swift_name("Point3D.init(x:y:z:)"))); // Import as method struct Point3D rotatePoint3D(Point3D point, float radians) __attribute__((swift_name("Point3D.rotate(self:radians:)")));
༬ઃܯࠂᔒ༗༻౸తճၚᆴ • ᙛfunc ༗ճၚᆴɼୠੋᔒ༗ඃ༻౸త࣌ީሡ။༬ઃग़ݱܯࠂ func getScore()->Int { return 56 }
var score = 0 getScore() //will raise warning print(score) • ݱࡏ༬ઃෆ။ܯࠂɼ༻@warn_unused_result ՄҎ㗞ੜܯ ࠂɻ • ະိ༬ઃܯࠂɼՄҎ༻@discardableResult ိऔফܯࠂɻ
Evolution • SE-0016 Unsafe[Mutable]Pointer ՄҎ Int • SE-0053 function ჩᏐதෆ࠶ՄҎ༗
let • SE-0054 Abolish ImplicitlyUnwrappedOptional type • SE-0055 ᩋUnsafe Pointer༻Optional ိදࣔ nullability
Unsafe[Mutable]Pointer ՄҎ [U]Int • ՄҎPointer Int ೭ޙ၏֤छӡࢉɻ • ᩋSwift
ՄҎ၏ߋଟతܥ౷ఔࣜ
function ჩᏐதෆ࠶ՄҎ༗ let • function ჩᏐલpass by value ޙੋෆೳվᏓతɼະ ိ။શෆೳࡏჩᏐલ໘ଧ
let/var fun fLet(let a:Int) { print(a) } • ႔ɿະိ argument label ՄҎੋԿ keyword func fc(let l:Int) { print(l) } fc(let: 10)
ᩋUnsafe Pointer༻Optional ိ දࣔ nullability • ݱࡏᔒ༗㭎๏ኺType ग़Pointer ༗ᔒ༗Մೳੋ NULL
• ະိ Pointer ။Ճೖ Optional తޭೳ • if let ptr = nil_ptr { foo(ptr) }