Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up for free
Kolin Modifiers
kissybnts
June 26, 2017
Programming
2
220
Kolin Modifiers
「KotlinのLT会!Kotlin入門者の集い」で発表したやつの全部込み版です。
kissybnts
June 26, 2017
Tweet
Share
More Decks by kissybnts
See All by kissybnts
JavaエンジニアからみたVapor
kissybnts
0
160
Other Decks in Programming
See All in Programming
How to start contributing to Kubernetes Projects
ydfu
0
150
Google I/O 2022 Android関連概要 / Google I/O 2022 Android summary
phicdy
1
410
2022年のモダンCSS改
tonkotsuboy_com
24
17k
How to Test Your Compose UI (Droidcon Berlin 2022)
stewemetal
1
130
kintoneでランダム取得を作ってみた(imoniCamp 2022-07-27)
shokun1108
0
150
Babylon.jsで作ったsceneをレイトレーシングで映えさせる
turamy
1
210
RustのWebフレームワーク周りの概観
hayao
0
180
レビュー駆動学習のススメ_StaPy#83
soogie
0
320
ZOZOTOWNにおけるDatadogの活用と、それを支える全社管理者の取り組み / 2022-07-27
tippy
1
3.5k
Amazon SageMakerでImagenを動かして猫画像生成してみた
hotoke_neko
0
120
AWS Config Custom Rule、ノーコードでできるかな?
watany
0
250
Pythonによる開発をアップデートするライブラリの紹介
daikikatsuragawa
1
810
Featured
See All Featured
Designing for Performance
lara
597
64k
Debugging Ruby Performance
tmm1
65
10k
What’s in a name? Adding method to the madness
productmarketing
11
1.6k
Building Your Own Lightsaber
phodgson
95
4.7k
Testing 201, or: Great Expectations
jmmastey
21
5.5k
Art Directing for the Web. Five minutes with CSS Template Areas
malarkey
196
9.5k
Docker and Python
trallard
27
1.6k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
181
15k
Fantastic passwords and where to find them - at NoRuKo
philnash
27
1.6k
In The Pink: A Labor of Love
frogandcode
131
21k
Faster Mobile Websites
deanohume
294
29k
ParisWeb 2013: Learning to Love: Crash Course in Emotional UX Design
dotmariusz
100
6k
Transcript
Kolin Modifiers ,PUMJOͷ-5ձʂ,PUMJOೖऀͷू͍
Name: Company: Role: Language: Kotlin: ͖ͩ͠ ServerSideEngineer, BridgeEngineer Java 1.0͘Β͍͔Β
None
None
,PUMJOʹؔʹ͚ͭΔ͜ͱ͕Ͱ͖Δ .PEJpFS म০ࢠ ͕͍Ζ͍Ζ͋Δ
‣ infix ‣ inline ‣ noinline ‣ crossinline ‣ reified
‣ tailrec
͜ΕΒΛઆ໌͠·͢
7JTJCJMJUZ.PEJpFSTάά͍ͬͯͩ͘͞
infix
Ҿ͕ͭͷϝιουΛ ׅހͳ͠Ͱ͑ΔΑ͏ʹ͢Δ
None
infix Modifier
StringΫϥεͷ֦ுؔ
ҾҰͭ
͜Μͳ෩ʹ͑Δ
w ϝϯόؔ·֦ͨுؔ w Ҿ͕ͭ w infixΛؔʹ͚ͭΔ ༻݅
ͪΖΜͭͳ͛ͯ͑Δ
͜ΕΛ
͜͏ͯ͠
͜ΕΛ
͜͏͢Δ
ͪͳΈʹ
͜ΕͩΊ
͜Ε0,
inline
'VODUJPOMJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠ ύϑΥʔϚϯεΛ্ͤ͞Δ
None
'VODUJPOMJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠ ύϑΥʔϚϯεΛ্ͤ͞Δ
'VODUJPOMJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠ ύϑΥʔϚϯεΛ্ͤ͞Δ
'VODUJPOMJUFSBMͱʁ
None
ແ໊ؔ
ϥϜμࣜͰ͞ΕΔ ؔͷ͜ͱ
ΠϯϥΠϯల։ͱʁ
؆୯ͳൺֱͰઆ໌
None
StringΫϥεͷ֦ுؔ
StringΛҾʹͱͬͯStringΛฦؔ͢
ҾͷؔΛ࣮ߦͯ͠ɺtoUpperCase()ͯ͠ฦ͢
inline Modifier
ͦΕҎ֎Ұॹ
None
݁Ռಉ͡
None
ͦΕͧΕ࣮ߦ࣌ʹͲ͏ͳΔͷ͔ʁ
inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠આ໌͠·͢ */
inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
SFDFJWFSͷΛ֨ೲ inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
֦ுؔͱಉ໊͡લͷ͕ؔ࡞͞ΕݺΕΔ inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ୈҰҾʹSFDFJWFS inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ؔΦϒδΣΫτͷΠϯελϯεΛ࡞ׂͯ͠Γͯ inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
/* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
JOWPLFͱ͍͏ϝιουΛͭ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
தϥϜμࣜͰͨ͠ॲཧ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
/* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠Ͱ͢ */ inlineແ͠
ϥϜμࣜͰͨ͠ॲཧΛͭΠϯελϯε /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠Ͱ͢ */ inlineແ͠
ϥϜμࣜͰͨ͠ॲཧΛ࣮ߦ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠Ͱ͢ */ inlineແ͠
toUpperCase()Λͯ͠ฦ͢ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠Ͱ͢ */ inlineແ͠
inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ϝιουݺͼग़͠ͷίετ inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
Πϯελϯεੜͷίετ inlineແ͠ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
None
/* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠આ໌͠·͢ */ inline͋Γ
inline͋Γ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ಉ͡ inline͋Γ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ϥϜμࣜͰͨ͠ॲཧ inline͋Γ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
toUpperCase()ͯ͠ऴΘΓ inline͋Γ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
ΠϯϥΠϯల։ inline͋Γ /* ཧղ͍͢͠Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
'VODUJPOMJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠ ύϑΥʔϚϯεΛ্ͤ͞Δ
Πϯελϯεͷੜίετ ϝιουݺͼग़͠ͷίετ
Πϯελϯεͷੜίετ ϝιουݺͼग़͠ͷίετ
None
ؔ࿈͢Δಛ
ϥϜμࣜͷதͰreturnΛͬͯ ݺͼग़͠ݩͷؔΛൈ͚Δ͜ͱ͕Ͱ͖Δ
inlineͳ͠
None
ίϯύΠϧΤϥʔ
͜ͷதͰݺͼग़͠ݩͷ͔ؔΒൈ͚Α͏ͱ͢Δ
inline͋Γ
None
σϑΥϧτͰinlineʹͳΒͳ͍ͷͳͥʜ
ΠϯϥΠϯԽ͢Δ͕ؔେ͖͍ͱ ੜ͞ΕΔίʔυ͕ංେԽ͢ΔՄೳੑ͕͋Δ
ϥϜμࣜͰͷreturn͕ޡղΛট͖͍͢ /* ͜Εओ؍Ͱ͢ */
noinline
ΠϯϥΠϯԽ͠ͳ͍ؔΛࢦఆͰ͖Δ
None
noinline Modifier
͜ͷؔΠϯϥΠϯల։͞Εͳ͍
ͬͪ͜ͷؔΠϯϥΠϯల։͞ΕΔ
crossinline
ҾͷؔΛinlineؔҎ֎ͷจ຺Ͱ ࣮ߦͰ͖ΔΑ͏ʹ͢Δ
None
None
͞ΕͨؔΛ
Invokableܕͷಗ໊Ϋϥεͷ
injectedFunction()ͱ͍͏ϝιουͷ࣮ʹ͍͍ͨ
abstract class Invokable { fun invoke(arg: String): String { val
before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" }
abstract class Invokable { fun invoke(arg: String): String { val
before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } injectedFunction()ͱ͍͏abstractϝιου
abstract class Invokable { fun invoke(arg: String): String { val
before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } invoke()ͱ͍͏ϝιουͷதͰ
abstract class Invokable { fun invoke(arg: String): String { val
before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } ͏
ίϯύΠϧΤϥʔ
None
None
crossinline Modifier
͑Δ
reified
inlineؔͰ ܕύϥϝʔλʹΞΫηεՄೳʹ͢Δ
ܕύϥϝʔλ
ClassΫϥεΛҾʹऔΔ
ಉ͡ܕͷListΛฦ͢
͞ΕͨํʹΑͬͯॲཧΛ͚Δ
None
None
None
inline Modifier
reified Modifier
Ҿແ͠
ܕύϥϝʔλ͕ར༻Ͱ͖Δ
None
ܕΛએݴ͢Δ
Ҿͳ͠Ͱ࣮ߦ
ܕΛਪ͢Δ
ܕΛࢦఆ࣮ͯ͠ߦ
None
None
ActivityΫϥεͷ֦ுؔ
reifiedΛ͚ͭͯΞΫηεՄೳʹ
Activity.findViewById()ͷΓΛ
ܕύϥϝʔλͰࢦఆ͞ΕΔܕʹΩϟετͯ͠ฦ͢
ܕએݴΛ͢Δ
ຖճΩϟετΛॻ͘ඞཁ͕ͳ͘ͳΔ
None
tailrec
ඌ࠶ؼͳؔͷ࣮ߦΛ࠷దԽ͢Δ
ඌ࠶ؼ
wؔܕݴޠͰΑ͘ݟΔελΠϧ wϧʔϓͷॲཧΛସ͢Δ wؔͷ࠷ޙʹࣗΛݺͼग़͢
None
tailrec Modifier
දࣔ͢Δϝοηʔδ
දࣔ͢Δճ
ճ͕0ҎԼͷ࣌return
ϝοηʔδΛදࣔͯ͠
ճΛݮΒͯࣗ͠Λݺͼग़͢
tailrecແ͠ͰίϯύΠϧͰ͖Δ
ͳʹ͕ҧ͏ͷ͔ʁ
tailrecແ͠ͷ߹
None
ίϯύΠϧ͞Εͯ΄΅ಉ͡
4UBDL0WFS'MPX͕ى͖ΔՄೳੑ͕ߴ͍
None
tailrec͋Γͷ߹
while͕࣮ߦ͞ΕΔ
ࣗΛݺͼग़͞ͳ͍
4UBDL0WFS'MPX͕ى͖ΔՄೳੑ͕͘ͳΔ
None
4UBDL0WFS'MPX͕ى͖ͳ͍Θ͚Ͱͳ͍
Ҏ্
&OKPZ,PUMJO