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Re: エラーと警告でコードをデザインする
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Yuka Ezura
March 22, 2017
Programming
2
960
Re: エラーと警告でコードをデザインする
Yuka Ezura
March 22, 2017
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Transcript
Re: ΤϥʔͱܯࠂͰ ίʔυΛσβΠϯ͢Δ 2017/3/22 ezura
ςετ ։ൃମ੍ɾڥ ઃܭࢥɾཧ ݴޠʹΑΔ αϙʔτ j j j j ϜϲεϮϥᩆᕥ
https://speakerdeck.com/ezura/eratojing-gao-de-kodowodezainsuru-chi- tohuang-falselun-wu-qu ΤϥʔͱܯࠂͰίʔυΛσβΠϯ͢Δ NFUIPEṺ΅ᲇͩᘡᔀ͞ᩆ͖ͩͥͺΤ θϸϖΩϰᙉͽݕᒕͫΝ
લఏ struct Object { var name: String var something: Any
func common() { /* do something */ } func method1() { /* do something */ } func method2() { /* do something */ } }
method1 Λ࣮ߦ͔ͯ͠ΒͷΈ method2 Λ࣮ߦՄೳ (ҧΛίϯύΠϧ࣌ʹݕ) Mission1 // OK object.method1().method2() //
Error object.method2()
method1, method2 Λ࣮ߦޙͷ ΠϯελϯεͷΈҾͱͯ͠ड͚औΔؔ (ҧΛίϯύΠϧ࣌ʹݕ) Mission2 // OK accept(object.method1().method2()) //
Error accept(object.method2())
࣮
࣮ͷ֓೦ਤ instance Init state instance State1 instance State2 func method1
func method2
struct Object<State> { var name: String var something: Any func
common() { /* do something */ } }
extension Object where State: Init { func method1() -> Object<State1>
{ /* do something */ } } extension Object where State: State1 { func method2() -> Object<State2> { /* do something */ } } func accept(_ object: Object<State2>) { /* do something */ }
࣮ͷ֓೦ਤ instance Init state instance State1 instance State2 func method1
func method2 Object<Init> Object<State1> Object<State2>
ཧΘ͔ͬͨʂ ࣮ʹམͱ͠ࠐΜͰΈΑ͏
extension Object where State: Init { func method1() -> Object<State2>
{ let object = Object<State2>(…) // Object ͷϓϩύςΟΛҾ͖ܧ͗ return object } }
ܕύϥϝʔλ͕ҧ͏Πϯελϯε (= ҟͳΔܕ) ͷؒͰͲ͏ͬͯσʔλΛҾ͖ܧ͝͏…
Object<Init> ͔Β Object<State1> σʔλΛҾ͖ܧ͙ʹʁʁ new.name = self.name new.something =
self.something struct Container { var name: String var something: Any }
ΩϟετͰ͖ΔΑʂ ۽୩͞Μ
Object<Init> ͔Β Object<State1> extension Object where State: Init {
func method1() -> Object<State2> { let object = unsafeBitCast(self, to: Object<State2>.self) // do something return object } } Object<Init> ͔Β Object<State1> Cast
࣮Ͱ͖ͨʂ ͍উखͲ͏͔ͳʁʁ
let object = Object<Init>(name: "sample", something: "something") <Init> ͷ໌͕ࣔඞཁ… (´ɾωɾʆ)
ίϯύΠϥʹ͑ͯΈΑ͏
extension Object where State: Init { init(name: String, something: Any)
{ self.name = name self.something = something } } State ͕ Init ͷͱ͖ͷΈ ίϯετϥΫλΛએݴ
let object = Object(name: "sample", something: "something") <Init> ͷ໌͕ࣔෆཁ :
͜Ε͕ՄೳͱͳΔ͕݅͋Γ·ׂ͕͢Ѫ͠·͢ (͕݅ἧ͍ͬͯͳ͍߹ɺίϯύΠϧΤϥʔ)
ͱͬͯ៉ྷʹͳΓ·ͨ͠ʂʂ ٩( 'ω' )و
https://gist.github.com/ezura/ e71db2b0471285061f9700809f92f2b1 ίʔυ
ࢀর • ۽୩ͱ៸໘͕ϓϩάϥϛϯάίʔυͷ͔Βௌ͑ͯ͘͜ ΔʹࣖΛָ͚ͯ͠ΉϥδΦ #9, #14 http://mookmookradio.com/a0005/ • where Ͱͷܕਪͷఏএऀͷํͷ
gist https://gist.github.com/tarunon/ d7071689ab55e29bd367a44833687aa3 • ΤϥʔͱܯࠂͰίʔυΛσβΠϯ͢Δ https://speakerdeck.com/ezura/eratojing-gao-de- kodowodezainsuru-chi-tohuang-falselun-wu-qu