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

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0CKFDU0SJFOUFE$POGFSFODF !͓஡ͷਫঁࢠେֶڞ (Pͷιʔείʔυ͔ΒಡΈղ͘ ΦϒδΣΫτࢦ޲ϓϩάϥϛϯά BETIPMPLP BETIPMPLP

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ࣗݾ঺հ 4IPHP"SBLBXB J04&OHJOFFS !4BOTBO BETIPMPLP BETIPMPLP

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ࠓ೔࿩͢͜ͱ w (Pͷιʔείʔυͷઃܭ͔ΒΦϒδΣΫτࢦ޲ͷΤοηϯεΛֶ΅͏ w ΦϒδΣΫτࢦ޲ͷҰ୺Ͱ͋ΔσβΠϯύλʔϯʹ͍ͭͯ࿩͠·͢ ϘτϜΞοϓͰΦϒδΣΫτࢦ޲ͷਅ਷ΛֶͿ

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(Pʹ͍ͭͯ w (PPHMF͕։ൃͨ͠ݴޠ w ೥݄ʹॳϦϦʔε w 3PC1JLFɺ,FO5PNQTPOʢݩ6/*9 ։ൃऀʣΒ͕ॳظઃܭͨ͠੩తܕ෇͚ݴޠ w ͭ·Γ6/*9ͷΤοηϯε͕٧·͍ͬͯΔ

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ͦ΋ͦ΋ʜ (P͸ΦϒδΣΫτࢦ޲ݴޠ͔ʁ

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(P͸ΦϒδΣΫτࢦ޲ݴޠʁ https://golang.org/doc/faq

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(P͸ΦϒδΣΫτࢦ޲ݴޠʁ https://golang.org/doc/faq

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l:FTBOEOP"MUIPVHI(PIBTUZQFTBOENFUIPETBOE BMMPXTBOPCKFDUPSJFOUFETUZMFPGQSPHSBNNJOH UIFSF JTOPUZQFIJFSBSDIZ5IFDPODFQUPGlJOUFSGBDFzJO(P QSPWJEFTBEJGGFSFOUBQQSPBDIUIBUXFCFMJFWFJTFBTZ UPVTFBOEJOTPNFXBZTNPSFHFOFSBM5IFSFBSFBMTP XBZTUPFNCFEUZQFTJOPUIFSUZQFTUPQSPWJEF TPNFUIJOHBOBMPHPVTCVUOPUJEFOUJDBMUP TVCDMBTTJOH.PSFPWFS NFUIPETJO(PBSFNPSF HFOFSBMUIBOJO$PS+BWBz *T(PBOPCKFDUPSJFOUFEMBOHVBHF

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w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճ঺հ͢Δύλʔϯ

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w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճ঺հ͢Δύλʔϯ

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JP3FBEFSΠϯλʔϑΣʔε

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JP3FBEFSΠϯλʔϑΣʔε Ҿ਺ ໭Γ஋

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ྫϑΝΠϧಡΈࠐΈͷྫ

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3FBEFSΠϯλʔϑΣʔε ଞʹ΋ͨ͘͞Μ͋ΔΑʂ 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

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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

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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

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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

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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

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ྫόοϑΝϦϯά͋ΓϑΝΠϧಡΈࠐΈ ˞্ه͸JPVUJM3FBE'JMFͱ͍͏ศརϝιουͰ΋୅ସՄೳ ʢόοϑΝ֬อͷαΠζ͸ҟͳΔʣ

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3FBEFSΛ૊Έ߹ΘͤΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS PT'JMF

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୯७Խ͢Δͱʜ JOUFSGBDF JP3FBEFS CVpP3FBEFS PT'JMF CVpP3FBEFS͕JP3FBEFSΛϥοϓͰ͖Δߏ଄

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w JP3FBEFSΛϑΟʔϧυʹ࣋ͭ w ϑΟʔϧυʹ୅ೖ͞Ε͍ͯΔ۩৅Ϋ ϥεʹ͸Ұ੾ؔ༩͠ͳ͍ CVpPHP CVpP3FBEFS

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ϑΝΠϧʹͯ͠΋ 3FBEFS͑͞ܧঝ͍ͯ͠Ε͹ ԿͰ΋ࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS PT'JMF

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ίωΫγϣϯʹͯ͠΋ 3FBEFS͑͞ܧঝ͍ͯ͠Ε͹ ԿͰ΋ࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS OFU*1$POO

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ࣗ࡞3FBEFSʹͯ͠΋ 3FBEFS͑͞ܧঝ͍ͯ͠Ε͹ ԿͰ΋ࠩ͠ସ͑ΒΕΔ CVpP3FBEFS JOUFSGBDF JP3FBEFS JOUFSGBDF JP3FBEFS ࣗ࡞3FBEFS

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"UPVSPG(P305

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JP3FBEFSͷԿ͕خ͍͔͠ʁ w ݺͼग़͠ݩ͔Β͢Ε͹ಡΈग़͠ݩͷιʔεΛҰ੾ҙࣝͤͣʹ͢Ή w JP3FBEFSʹ४ڌ͢Δͱಁաతʹ༷ʑͳػೳΛ֦ு͢Δ͜ͱ͕ग़དྷΔ w FH όοϑΝ͋Γ ϑΝΠϧιέοτ૊Έ߹Θͤ͸ແݶେʂ ˞(P'ͷσβΠϯύλʔϯͰݴ͑͹$PNQPTJUF4UBSBUFHZύλʔϯʹ͍͔ۙ΋

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w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ࠓճ঺հ͢Δύλʔϯ

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ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ ˞࣮ࡍ͸΋͏গ͠ෳࡶͰ͢

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ίϯύΠϥͷಈ͖ ̑ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ <̑ >

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ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ <̑ > ˎ

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ίϯύΠϥͷಈ͖ ιʔείʔυ ࣈ۟ղੳ ߏจղੳ ҙຯղੳ ࠷దԽ ࣮ߦϑΝΠϧग़ྗ ˎ ׂѪ

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໦ߏ଄Λ८ճ͍ͨ͠ ˎ ໦Λ͍͍ײ͡ʹ८ճͭͭ͠ɺͦͷϊʔυʹैͬͨॲཧΛ͍ͨ͠

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໦ߏ଄Λ८ճ͍ͨ͠ w 7JTJUPS͸໦Λ८ճ͢Δ w /PEF͸֤અ఺Λදݱ͢Δ w &YQS͸/PEFΛ֦ுͨ͠Πϯ λʔϑΣʔε BTUXBMLHP BTUBTUHP

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/PEFͷछྨͨͪ ˎ /PEF

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/PEFͷछྨͨͪ ˎ &YQS

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/PEFͷछྨͨͪ JOUFSGBDF /PEF JOUFSGBDF &YQS JOUFSGBDF %FDM #BTJD-JU FH ੔਺Ϧςϥϧ #JOBSZ&YQS FH ೋ߲ԋࢉࢠ *EFOU FH ม਺ ʜ JOUFSGBDF 4UNU

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/PEFͷछྨͨͪ ˎ #JOBSZ&YQS #BTJD-JU

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#BTJD-JU

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#JOBSZ&YQS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS 9 :

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८ճ 8BML ͷಈ͖ ˎ 7JTJUPS

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Կ͕خ͍͠ͷ͔ʁ w ८ճͱ๚໰࣌ͷϊʔυૢ࡞ͷ੹຿ͷ෼཭͕Ͱ͖Δ͜ͱ w ८ճ͸Ͳͷछྨͷϊʔυ͔ʹ͸ؔ༩ͤͣಁաతͳΞΫηε͕Ͱ͖Δ w ֤ϊʔυ͝ͱʹઐ༻ͷॲཧΛॻ͘ͷͰίʔυͷݟ௨͕͠ྑ͍ w ϊʔυૢ࡞ʢ7JTJUʣΛϢʔβ͕֦ு͢Δ͜ͱ͕Ͱ͖Δ ˞(P'ͷσβΠϯύλʔϯͰݴ͑͹7JTJUPSύλʔϯʹ͍͕ۙɺ׬શʹҰக͍ͯ͠ΔΘ͚Ͱ͸ͳ͍

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ࠓճ঺հͨ͠ύλʔϯ w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ

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Ͳ͕͜ΦϒδΣΫτࢦ޲ͩͬͨͷ͔ʁ

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w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ Ͳ͕͜ΦϒδΣΫτࢦ޲ͩͬͨͷ͔ʁ ݺͼग़͠ݩ͔Βৄࡉͷ࣮૷Λҙࣝ͠ͳ͍ ৄࡉ͸ͦͷੑ࣭͝ͱʹಈ࡞͢Δ

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Ͳ͕͜ΦϒδΣΫτࢦ޲ͩͬͨͷ͔ʁ w ಡΈࠐΈॲཧΛಁաతʹѻ͏ͨΊͷ3FBEFSʢඪ४ϥΠϒϥϦΑΓʣ w ໦૸ࠪΛݡ͘ಁաతʹѻ͏ͨΊͷ7JTJUPSʢݴޠॲཧܥΑΓʣ ΧϓηϧԽ ϙϦϞʔϑΟζϜ

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࠷ޙʹ lจ໌ͷਐา͸ɺਓ͕ҙࣝͤͣʹ਱ߦՄೳͳ ॏཁԋࢉͷ਺త֦େʹΑΓ΋ͨΒ͞ΕΔz "MGSFE/PSUI8IJUFIFBEʢ਺ֶऀʣ

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ຊࢿྉ͸TQFBLFSEFDLʹͯެ։ࡁΈͰ͢ BETIPMPLP BETIPMPLP 5IBOLZPV