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
いま注目しているデータエンジニアリングの論点
ikkimiyazaki
0
590
Why Governance Matters: The Key to Reducing Risk Without Slowing Down
sarahjwells
0
110
Large Vision Language Modelを用いた 文書画像データ化作業自動化の検証、運用 / shibuya_AI
sansan_randd
0
100
Exadata Database Service on Dedicated Infrastructure(ExaDB-D) UI スクリーン・キャプチャ集
oracle4engineer
PRO
2
5.4k
【新卒研修資料】LLM・生成AI研修 / Large Language Model・Generative AI
brainpadpr
23
17k
社内お問い合わせBotの仕組みと学び
nish01
0
240
生成AIを活用したZennの取り組み事例
ryosukeigarashi
0
200
AI ReadyなData PlatformとしてのAutonomous Databaseアップデート
oracle4engineer
PRO
0
170
多野優介
tanoyusuke
1
420
OpenAI gpt-oss ファインチューニング入門
kmotohas
2
960
空間を設計する力を考える / 20251004 Naoki Takahashi
shift_evolve
PRO
3
330
Shirankedo NOCで見えてきたeduroam/OpenRoaming運用ノウハウと課題 - BAKUCHIKU BANBAN #2
marokiki
0
140
Featured
See All Featured
Code Reviewing Like a Champion
maltzj
525
40k
Documentation Writing (for coders)
carmenintech
75
5k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
Rebuilding a faster, lazier Slack
samanthasiow
84
9.2k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
2.6k
Scaling GitHub
holman
463
140k
Practical Orchestrator
shlominoach
190
11k
Writing Fast Ruby
sferik
629
62k
Fireside Chat
paigeccino
40
3.7k
Making the Leap to Tech Lead
cromwellryan
135
9.5k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
140
34k
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