Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
self in return type declaration
Search
DQNEO
June 27, 2018
Technology
1
180
self in return type declaration
PHPの戻り値型宣言でselfを使ってみよう
DQNEO
June 27, 2018
Tweet
Share
More Decks by DQNEO
See All by DQNEO
英和辞書付きGo言語仕様書 / Word Wise Go Spec
dqneo
1
550
Go言語低レイヤー入門 Hello world が 画面に表示されるまで / Introduction to low level programming in Go
dqneo
6
1.7k
入門Go言語仕様 / Go Specification Untyped Constants
dqneo
1
1.3k
入門Go言語仕様 Underlying Type / Go Language Underlying Type
dqneo
9
5.2k
How to write a self hosted Go compiler from scratch (Gophercon 2020)
dqneo
3
1.7k
もっと気軽にOSSに Pull Requestを出そう!/ Let's make a PR to OSS more easily
dqneo
6
8.3k
Goコンパイラをゼロから作ってセルフホスト達成するまで / How I wrote a self hosted Go compiler from scratch
dqneo
15
15k
コンパイラをつくってみよう / How to make a compiler
dqneo
9
11k
コンパイラ作りの魅力を語る / Making compilers is fun
dqneo
10
8.5k
Other Decks in Technology
See All in Technology
Performance Insights 廃止から Database Insights 利用へ/transition-from-performance-insights-to-database-insights
emiki
0
310
プレーリーカードを活用しよう❗❗デジタル名刺交換からはじまるイベント会場交流のススメ
tsukaman
0
180
セキュアな認可付きリモートMCPサーバーをAWSマネージドサービスでつくろう! / Let's build an OAuth protected remote MCP server based on AWS managed services
kaminashi
3
350
AWS Top Engineer、浮いてませんか? / As an AWS Top Engineer, Are You Out of Place?
yuj1osm
2
220
Findy Team+ QAチーム これからのチャレンジ!
findy_eventslides
0
440
AIとともに歩んでいくデザイナーの役割の変化
lycorptech_jp
PRO
0
480
そのWAFのブロック、どう活かす? サービスを守るための実践的多層防御と思考法 / WAF blocks defense decision
kaminashi
0
200
CoRL 2025 Survey
harukiabe
1
220
AI時代こそ求められる設計力- AWSクラウドデザインパターン3選で信頼性と拡張性を高める-
kenichirokimura
3
350
Digitization部 紹介資料
sansan33
PRO
1
5.6k
生成AI時代のセキュアコーディングとDevSecOps
yuriemori
0
120
「使い方教えて」「事例教えて」じゃもう遅い! Microsoft 365 Copilot を触り倒そう!
taichinakamura
0
440
Featured
See All Featured
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
Writing Fast Ruby
sferik
629
62k
Done Done
chrislema
185
16k
The Invisible Side of Design
smashingmag
302
51k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
52
5.6k
Java REST API Framework Comparison - PWX 2021
mraible
34
8.9k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
359
30k
Building an army of robots
kneath
306
46k
Bash Introduction
62gerente
615
210k
A designer walks into a library…
pauljervisheath
209
24k
Optimizing for Happiness
mojombo
379
70k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.6k
Transcript
!%2/&0 Ͳ͖ΎͶ͓ BU.FSDBSJ QIQTUVEZ lTFMGzJO 3FUVSO5ZQF%FDMBSBUJPO
(JUຊͷम͠·ͨ͠
3FUVSOUZQFEFDMBSBUJPO Γͷܕએݴ ͬͯ·͔͢ʁ
function foo(): int { } Γͷܕએݴͱʁ ͜Μͳͭ
ྫɿࣗΛฦ͢ϝιου class A { public function getMe(): A { return
$this; } }
࣮TFMGͱॻ͚Δ class A { public function getMe(): self { return
$this; } }
ΜΓʂʂ
ҙ֎ͱΒͳ͍ਓ ଟ͍ҹ
ެࣜυΩϡϝϯτʹ ͳ͔ͥTFMGʹ͍ͭͯ ݴٴͳ͠ IUUQQIQOFUNBOVBMFOGVODUJPOTSFUVSOJOH WBMVFTQIQGVODUJPOTSFUVSOJOHWBMVFTUZQFEFDMBSBUJPO
3'$ͷԼͷํʹখ͞ʙ͘ ॻ͍ͯ͋Δ IUUQTXJLJQIQOFUSGDSFUVSO@UZQFT
ܧঝ͢ΔͱͲ͏ͳΔʁ class A { public function getMe(): self { return
$this; } } class B extends A {} $b = new B(); $b->getMe(); // ?
ਖ਼ղ#ͷΠϯελϯε͕ฦΔ class A { public function getMe(): self { return
$this; } } class B extends A {} $b = new B(); $b->getMe(); // instance of B
UIJTɺ#ͷίϯςΩε τ͔ΒݺΕΔͱ#ͷΠ ϯελϯεΛࢦ͢ͷͰɻ
ࠨͷίʔυӈͷίʔυͱՁ class A { public function getMe(): A { return
$this; } } class B extends A {} $b = new B(); $b->getMe(); // B class A { public function getMe(): self { return $this; } } class B extends A {} $b = new B(); $b->getMe(); // B
Γͷܕɺ ࣮ߦ࣌ʹSFUVSO͞Εͨࡍʹ JOTUBODFPG తͳͷͰ ͰνΣοΫ͞ΕΔ
͜ͷ߹Ͳ͏ͳΔʁ class A { public function getMe(): self { return
$this; } } class B extends A { public function getMe(): self { return $this; } }
'BUBMFSSPS ࣮ߦ࣌ίϯύΠϧΤϥʔ 1)1'BUBMFSSPS %FDMBSBUJPOPG#HFU.F #NVTUCFDPNQBUJCMFXJUI "HFU.F "
͜Ε͕μϝͳͷͱಉ͡ γάωνϟͷෆҰக class A { public function getMe(): A
… } class B extends A { public function getMe(): B … }
͜͏͢Ε͓̺ class A { public function getMe(): self { return
$this; } } class B extends A { public function getMe(): parent { return $this; } }
͜Ε͕0,ͳͷͱಉ͡ class A { public function getMe(): A … }
class B extends A { public function getMe(): A … }
༨ஊɿ͜Εকདྷͷ1)1Ͱ ՄೳʹͳΔ͔͠Εͳ͍ɻ Γͷڞม class A { public function getMe():
A } class B extends A { public function getMe(): B … } IUUQTXJLJQIQOFUSGDDPWBSJBOUSFUVSOTBOE DPOUSBWBSJBOUQBSBNFUFST
ͪͳΈʹܕ໊ͷͱ͜Ζʹ TUBUJDෆՄɻ class A { public function getMe(): static …
}
·ͱΊ w ΓܕએݴͰTFMG QBSFOU ͕͑Δ w ཚ༻͢ΔͱΘ͔Γʹ͘͘ͳΔ ͷͰదࡐదॴͰ w ʮJOTUBODFPGνΣοΫʯͩͱ
ࢥ͓̺͑
༨ஊɿϝιουͷҾͰ͑Δ class A { public function setMe(self $self) { $this->self
= $self; } } class B extends A { public function setMe(parent $self) { $this->self = $self; } }
͝ਗ਼ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠ NN