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Goのソースコードから読み解くオブジェクト指向プログラミング@Object-Oriented ...
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arakawa
February 11, 2020
Programming
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Goのソースコードから読み解くオブジェクト指向プログラミング@Object-Oriented Conference 2020
arakawa
February 11, 2020
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Transcript
0CKFDU0SJFOUFE$POGFSFODF !͓ͷਫঁࢠେֶڞ (Pͷιʔείʔυ͔ΒಡΈղ͘ ΦϒδΣΫτࢦϓϩάϥϛϯά BETIPMPLP BETIPMPLP
ࣗݾհ 4IPHP"SBLBXB J04&OHJOFFS !4BOTBO BETIPMPLP BETIPMPLP
ࠓ͢͜ͱ w (Pͷιʔείʔυͷઃܭ͔ΒΦϒδΣΫτࢦͷΤοηϯεΛֶ΅͏ w ΦϒδΣΫτࢦͷҰͰ͋ΔσβΠϯύλʔϯʹ͍ͭͯ͠·͢ ϘτϜΞοϓͰΦϒδΣΫτࢦͷਅΛֶͿ
(Pʹ͍ͭͯ w (PPHMF͕։ൃͨ͠ݴޠ w ݄ʹॳϦϦʔε w 3PC1JLFɺ,FO5PNQTPOʢݩ6/*9 ։ൃऀʣΒ͕ॳظઃܭͨ͠੩తܕ͚ݴޠ w ͭ·Γ6/*9ͷΤοηϯε͕٧·͍ͬͯΔ
ͦͦʜ (PΦϒδΣΫτࢦݴޠ͔ʁ
(PΦϒδΣΫτࢦݴޠʁ https://golang.org/doc/faq
(PΦϒδΣΫτࢦݴޠʁ https://golang.org/doc/faq
l:FTBOEOP"MUIPVHI(PIBTUZQFTBOENFUIPETBOE BMMPXTBOPCKFDUPSJFOUFETUZMFPGQSPHSBNNJOH UIFSF JTOPUZQFIJFSBSDIZ5IFDPODFQUPGlJOUFSGBDFzJO(P QSPWJEFTBEJGGFSFOUBQQSPBDIUIBUXFCFMJFWFJTFBTZ UPVTFBOEJOTPNFXBZTNPSFHFOFSBM5IFSFBSFBMTP XBZTUPFNCFEUZQFTJOPUIFSUZQFTUPQSPWJEF TPNFUIJOHBOBMPHPVTCVUOPUJEFOUJDBMUP TVCDMBTTJOH.PSFPWFS NFUIPETJO(PBSFNPSF
HFOFSBMUIBOJO$ PS+BWBz *T(PBOPCKFDUPSJFOUFEMBOHVBHF
l:FTBOEOP"MUIPVHI(PIBTUZQFTBOENFUIPETBOE BMMPXTBOPCKFDUPSJFOUFETUZMFPGQSPHSBNNJOH UIFSF JTOPUZQFIJFSBSDIZ5IFDPODFQUPGlJOUFSGBDFzJO(P QSPWJEFTBEJGGFSFOUBQQSPBDIUIBUXFCFMJFWFJTFBTZ UPVTFBOEJOTPNFXBZTNPSFHFOFSBM5IFSFBSFBMTP XBZTUPFNCFEUZQFTJOPUIFSUZQFTUPQSPWJEF TPNFUIJOHBOBMPHPVTCVUOPUJEFOUJDBMUP TVCDMBTTJOH.PSFPWFS NFUIPETJO(PBSFNPSF
HFOFSBMUIBOJO$ PS+BWBz *T(PBOPCKFDUPSJFOUFEMBOHVBHF
w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճհ͢Δύλʔϯ
w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճհ͢Δύλʔϯ
JP3FBEFSΠϯλʔϑΣʔε
JP3FBEFSΠϯλʔϑΣʔε Ҿ Γ
ྫϑΝΠϧಡΈࠐΈͷྫ
3FBEFSΠϯλʔϑΣʔε ଞʹͨ͘͞Μ͋ΔΑʂ JOUFSGBDF JP3FBEFS 3FBE Q<>CZUF OJOU FSSFSSPS CVpP3FBEFS
3FBE Q<>CZUF OJOU FSSFSSPS PT'JMF 3FBE Q<>CZUF OJOU FSSFSSPS OFU*1$POO 3FBE Q<>CZUF OJOU FSSFSSPS
ϑΝΠϧ͔ΒಡΈࠐΈΛ࣮ݱ͢Δ3FBEFS 3FBEFSΠϯλʔϑΣʔε JOUFSGBDF JP3FBEFS 3FBE Q<>CZUF OJOU FSSFSSPS CVpP3FBEFS
3FBE Q<>CZUF OJOU FSSFSSPS PT'JMF 3FBE Q<>CZUF OJOU FSSFSSPS OFU*1$POO 3FBE Q<>CZUF OJOU FSSFSSPS
3FBEFSΠϯλʔϑΣʔε JOUFSGBDF JP3FBEFS 3FBE Q<>CZUF OJOU FSSFSSPS CVpP3FBEFS 3FBE
Q<>CZUF OJOU FSSFSSPS PT'JMF 3FBE Q<>CZUF OJOU FSSFSSPS OFU*1$POO 3FBE Q<>CZUF OJOU FSSFSSPS όοϑΝ͔ΒಡΈࠐΈΛ࣮ݱ͢Δ3FBEFS
3FBEFSΠϯλʔϑΣʔε *1ίωΫγϣϯ͔ΒಡΈࠐΈΛ࣮ݱ͢Δ3FBEFS JOUFSGBDF JP3FBEFS 3FBE Q<>CZUF OJOU FSSFSSPS CVpP3FBEFS
3FBE Q<>CZUF OJOU FSSFSSPS PT'JMF 3FBE Q<>CZUF OJOU FSSFSSPS OFU*1$POO 3FBE Q<>CZUF OJOU FSSFSSPS
3FBEFSΠϯλʔϑΣʔε JOUFSGBDF JP3FBEFS 3FBE Q<>CZUF OJOU FSSFSSPS CVpP3FBEFS 3FBE
Q<>CZUF OJOU FSSFSSPS PT'JMF 3FBE Q<>CZUF OJOU FSSFSSPS OFU*1$POO 3FBE Q<>CZUF OJOU FSSFSSPS ʮYYY͔ΒಡΈࠐΉʯ͜ͱ͕ڞ௨͍ͯ͠Δ
ྫόοϑΝϦϯά͋ΓϑΝΠϧಡΈࠐΈ ˞্هJPVUJM3FBE'JMFͱ͍͏ศརϝιουͰସՄೳ ʢόοϑΝ֬อͷαΠζҟͳΔʣ
3FBEFSΛΈ߹ΘͤΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS PT'JMF
୯७Խ͢Δͱʜ JOUFSGBDF JP3FBEFS CVpP3FBEFS PT'JMF CVpP3FBEFS͕JP3FBEFSΛϥοϓͰ͖Δߏ
w JP3FBEFSΛϑΟʔϧυʹ࣋ͭ w ϑΟʔϧυʹೖ͞Ε͍ͯΔ۩Ϋ ϥεʹҰؔ༩͠ͳ͍ CVpPHP CVpP3FBEFS
ϑΝΠϧʹͯ͠ 3FBEFS͑͞ܧঝ͍ͯ͠Ε ԿͰࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS PT'JMF
ίωΫγϣϯʹͯ͠ 3FBEFS͑͞ܧঝ͍ͯ͠Ε ԿͰࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS OFU*1$POO
ࣗ࡞3FBEFSʹͯ͠ 3FBEFS͑͞ܧঝ͍ͯ͠Ε ԿͰࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS ࣗ࡞3FBEFS
"UPVSPG(P305
JP3FBEFSͷԿ͕خ͍͔͠ʁ w ݺͼग़͠ݩ͔Β͢ΕಡΈग़͠ݩͷιʔεΛҰҙࣝͤͣʹ͢Ή w JP3FBEFSʹ४ڌ͢Δͱಁաతʹ༷ʑͳػೳΛ֦ு͢Δ͜ͱ͕ग़དྷΔ w FH όοϑΝ͋Γ ϑΝΠϧιέοτΈ߹Θͤແݶେʂ ˞(P'ͷσβΠϯύλʔϯͰݴ͑$PNQPTJUF4UBSBUFHZύλʔϯʹ͍͔ۙ
w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճհ͢Δύλʔϯ
ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ ˞࣮ࡍ͏গ͠ෳࡶͰ͢
ίϯύΠϥͷಈ͖ ̑ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ
࣮ߦϑΝΠϧग़ྗ <̑ >
ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ <̑
> ˎ
ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ
ˎ ׂѪ
ߏΛ८ճ͍ͨ͠ ˎ Λ͍͍ײ͡ʹ८ճͭͭ͠ɺͦͷϊʔυʹैͬͨॲཧΛ͍ͨ͠
ߏΛ८ճ͍ͨ͠ w 7JTJUPSΛ८ճ͢Δ w /PEF֤અΛදݱ͢Δ w &YQS/PEFΛ֦ுͨ͠Πϯ λʔϑΣʔε BTUXBMLHP BTUBTUHP
/PEFͷछྨͨͪ ˎ /PEF
/PEFͷछྨͨͪ ˎ &YQS
/PEFͷछྨͨͪ JOUFSGBDF /PEF JOUFSGBDF &YQS JOUFSGBDF %FDM #BTJD-JU FH Ϧςϥϧ
#JOBSZ&YQS FH ೋ߲ԋࢉࢠ *EFOU FH ม ʜ JOUFSGBDF 4UNU
/PEFͷछྨͨͪ ˎ #JOBSZ&YQS #BTJD-JU
#BTJD-JU
#JOBSZ&YQS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :
८ճ 8BML ͷಈ͖ ˎ 7JTJUPS
Կ͕خ͍͠ͷ͔ʁ w ८ճͱ๚࣌ͷϊʔυૢ࡞ͷͷ͕Ͱ͖Δ͜ͱ w ८ճͲͷछྨͷϊʔυ͔ʹؔ༩ͤͣಁաతͳΞΫηε͕Ͱ͖Δ w ֤ϊʔυ͝ͱʹઐ༻ͷॲཧΛॻ͘ͷͰίʔυͷݟ௨͕͠ྑ͍ w ϊʔυૢ࡞ʢ7JTJUʣΛϢʔβ͕֦ு͢Δ͜ͱ͕Ͱ͖Δ ˞(P'ͷσβΠϯύλʔϯͰݴ͑7JTJUPSύλʔϯʹ͍͕ۙɺશʹҰக͍ͯ͠ΔΘ͚Ͱͳ͍
ࠓճհͨ͠ύλʔϯ w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ
Ͳ͕͜ΦϒδΣΫτࢦͩͬͨͷ͔ʁ
w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ Ͳ͕͜ΦϒδΣΫτࢦͩͬͨͷ͔ʁ ݺͼग़͠ݩ͔Βৄࡉͷ࣮Λҙࣝ͠ͳ͍ ৄࡉͦͷੑ࣭͝ͱʹಈ࡞͢Δ
Ͳ͕͜ΦϒδΣΫτࢦͩͬͨͷ͔ʁ w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ΧϓηϧԽ ϙϦϞʔϑΟζϜ
࠷ޙʹ lจ໌ͷਐาɺਓ͕ҙࣝͤͣʹߦՄೳͳ ॏཁԋࢉͷత֦େʹΑΓͨΒ͞ΕΔz "MGSFE/PSUI8IJUFIFBEʢֶऀʣ
ຊࢿྉTQFBLFSEFDLʹͯެ։ࡁΈͰ͢ BETIPMPLP BETIPMPLP 5IBOLZPV