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エラーと警告で コードをデザインする ~赤と黄の輪舞曲~
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Yuka Ezura
August 20, 2016
Technology
6
4.2k
エラーと警告で コードをデザインする ~赤と黄の輪舞曲~
iosdc での発表資料です
Yuka Ezura
August 20, 2016
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Transcript
έϮ⑲ͺຓ θ⑲ώΤόλΩϸͫΝ _᧬ͺԫᇷዛູ_ 2016/8/20 ezura
FSSPS͜ṽͫ͟͝Ħ
XBSOJOH͜ṽͫ͟͝Ħ
None
None
None
Δͩ͘ͼΛj
Δ͵ͺ᪇͡ ཱͺᲇձ͖ͱ͝͵ͱj
ဒᘥ ࣮ḝ ᙉණ
͟ΝĈ ᦉᷯΔ͔Ν
࣮ḝ᧸ͽុΜΤ᧬ͺԫᓸ ᓸͣΑΐͩΙ͘
έϮ⑲ͺຓ θ⑲ώΤόλΩϸͫΝ _᧬ͺԫᇷዛູ_
↟1IBOUPN5ZQF ↟%FDMBSBUJPO"UUSJCVUFT
$BTF
class HogeOperation { /// Ұ͚ͩݺͿ͜ͱ func prepare() /// prepare ޙ͔Β͑Δ
func execute() /// ͍ͭݺΜͰྑ͍ func mob() }
/// Ұ͚ͩݺͿ͜ͱ /// prepare ޙ͔Β͑Δ
private var isPrepared = false /// Ұ͚ͩݺͿ͜ͱ func prepare() {
guard !isPrepared else { fatalError("prepare() Λෳݺͳ͍͜ͱ") } isPrepared = true }
None
None
όλΩϸͩΚ͘Ĉ
1IBOUPN5ZQF ܕใΛར༻ͯ͠ॲཧͷޡΓΛࢦఠՄೳʹ
ᴰᨷঢ়ỪΑ ᑿᠭ൱ၙͼϦςψώΤᨷᤅ
protocol OperationState {} class Init: OperationState {} class Prepared: OperationState
{}
class HogeOperation<State: OperationState> {}
extension HogeOperation where State: Init { /// Ұ͚ͩݺͿ͜ͱ func prepared()
-> HogeOperation<Prepared> { let readyOp = HogeOperation<Prepared>() // TODO: ඞཁͳσʔλΛҾ͖ܧ͗ return readyOp } }
θϸϖΩϰέϮ⑲ ỹ ỹ
None
extension HogeOperation where State: Prepared { /// prepare ΛݺΜͩޙ͔Β༻Մೳ func
execute() { /* do somethig */ } }
θϸϖΩϰέϮ⑲
ଓ͟8FC https://gist.github.com/ezura/ f5aebef7bb86edbfd40b0bd1d0435e00
1IBOUPN5ZQF͖Ο͖Ο ↟ 'VODUJPOBM4OJQQFU1IBOUPN5ZQFT ↟ 4XJGU.POFZXJUI1IBOUPN5ZQFT ↟ 4XJGU1IBOUPN5ZQF ྶṞ ↟
1IBOUPN5ZQFθϸϖΩϰᙉͽঢ়ᴋφάψδͫΝ TIJCVZBTXJGU ↑ ঢ়ଶભҠΛ៉ྷʹදݱ͍ͯͯ͠ײಈ
$BTF
/// ΘΓʹ fuga Λ͏͜ͱʂ func hoge() { … }
όλΩϸͩΚ͘Ĉ
%FDMBSBUJPO "UUSJCVUFT ใΛ༩
/// ΘΓʹ fuga() Λ͏͜ͱʂ @available(*, unavailable, message="͓ޚ໔͞…(ƅωƅ)", renamed="fuga") func hoge()
{ … }
/// ΘΓʹ fuga() Λ͏͜ͱʂ @available(*, unavailable, message="͓ޚ໔͞…(ƅωƅ)", renamed="fuga") func hoge()
{ … }
/// ΘΓʹ fuga() Λ͏͜ͱʂ @available(iOS, deprecated=1, message="͓ޚ໔͞…(ƅωƅ)", renamed="fuga") func hoge()
{ … }
ᬋණ ↟ !BWBJMBCMF ↟ !EJTDBSEBCMF3FTVMU 4XJGU͝Λ ↟ !XBSO@VOVTFE@SFTVMU 4XJGUഇᬬ
: Swift3 ͔ΒҰ෦༷͕มߋ͞Ε·͢
ᓸͣ ͖ͣͯͫ͘͝Ħ
ͦਗ਼ௌ͔Μ͞ͺ͖ͦͨ͘ΐͩͱĈ