コードで遊ぼう Go #1

source Code
https://bitbucket.org/BP-YooWaan/enjoycode

1. ίʔυͰ༡΅͏ #ͦͷ̍ Go
2. ࠓ೔ͷ࿩ Go ͍͍ͱ͜Ζ ΘΔ͍ͱ͜Ζ →ωοτͷ·ͱΊͷ·ͱΊ ͦΕΆ͍࿩ C++ͱൺֱ͠ͳ͕Βɾɾɾ
 ίʔυ͸ͪ͜Β͔Β https://bitbucket.org/BP-YooWaan/enjoycode/src
3. ͍͍ͱ͜Ζ ΘΔ͍ͱ͜Ζ
4. ͍͍ͱ͜Ζ GoogleͰ࡞ͬͯ·͢
 ʢ৴པͰ͖Δ͎ʙʣ ҎԼʹରॲ
 - ιϑτ΢ΣΞ։ൃ଎౓
 - ѻ͍ʹ͍͘λΠϓ
 - Multiple core/concurrency ػೳ
 - ੩తϦϯΫωΠςΟϒόΠφϦ
 - GC (ΨϕʔδίϨΫγϣϯ)
 - ڧ͍ܕ෇͚
 - Gorutines / Channels ͱ͔
 - Structs (ߏ଄ମ) / Interface
5. ΘΔ͍ͱ͜Ζ Go ͰάάΔͱݴޠͱؔ܎ͳ͍݁Ռ͕ग़ͯ͘Δɾɾɾ ൚༻ϓϩάϥϛϯά ݴޠ֦ுੑ ܕਪ࿦ ෆมੑ 
 ৄࡉ͸ͪ͜Β΁ʰGoݴޠ͕μϝͳཧ༝ ʱ( http://postd.cc/why-go-is-not-good/ ) ੍ޚϑϩʔߏ଄ ૊ΈࠐΈϓϩάϥϛϯά
6. ͦΕͬΆ͍࿩
7. ։ൃ؀ڥతͳ͜ͱ Go C proj.gyp # gyp ઃఆϑΝΠϧ
 inc/ # ϔομʔϑΝΠϧ
 src/ # ιʔεϑΝΠϧ
 out/Default
 build.ninja # gyp ੜ੒ϑΝΠϧ
 gyp-mac-tool # ಉ͡
 obj/
 <target>.ninja # ϦϯΫΦϓγϣϯͱ͔
 *.o # ΦϒδΣΫτϑΝΠϧ
8. ίϚϯυϦϑΝϨϯε Go C # ϏϧυσΟΫϨτϦੜ੒
 $ GYP_GENERATORS=ninja gyp proj.gyp 
 --toplevel-dir=. —depth=0 # build
 $ cd out/Default ; ninja # ࣮ߦ
 ./bin/{ exe file } # ࣮ߦίϚϯυදࣔ
 $ ninja -t command # ࡞ۀσΟϨΫτϦͷઃఆ
 $ export GOPATH={path to dir} # build
 $ go install {package name} # ࣮ߦ
 $ ./bin/{ exe file } # ৘ใදࣔ
 $ go env
9. ྫ Goͷ৔߹ GOPATH ʢ࡞ۀσΟϨΫτϦʣઃఆ όΠφϦ࡞੒ ࣮ߦ όΠφϦ
10. ྫ C++ͷ৔߹ ϏϧυσΟϨΫτϦ࡞੒ Ϗϧυ όΠφϦ
11. ߏจతͳʂʁ ίʔσΟϯά͸ ʮϊϦ͸LL͚ͩͲࠢ͸Cʯͱ͍͏ײ͡ ϙΠϯλ༗Γ·͢ ഑ྻɺϚοϓ༗Γ·͢ Τϥʔϋϯυϧɺฒྻॲཧ ಠࣗͰ͢
12. ϙΠϯλ͸ΫϦιπ C++(C) Go
13. ഑ྻ/Mapૢ࡞ C++(C) Go Goָ͕͚ͩͲ ѹউײ͸ͳ͍
14. Τϥʔϋϯυϧ C++(C) ׂѪ Go جຊతʹ໭Γ஋൑ఆ panic ͸ϥϯλΠϜΤϥʔ༻ recover() Ͱ෮چ
15. ߏ଄ମɺΠϯλʔϑΣΠε Ϋϥε͸ແ͍͚ͲɺΧϓηϧԽ͸Մೳʂʁ ଟଶੑ͋ΔΑ ʢμοΫλΠϐϯάʣ ߏ଄ମͷϝιου͋ΔΑ ΠϯλʔϑΣΠεͷϙΠϯλ͸৽઱
16. ߏ଄ମ Go ߏ଄ମఆٛ ϝιουఆٛ ຒΊࠐΜͰϑΟʔϧυ௥Ճ
17. ߏ଄ମ C++(C) Ϋϥεఆٛ Ϋϥε::ϝιουఆٛ Ϋϥεఆٛ Ϋϥε::ϝιουఆٛ λΠϓྔͺͳ͍
18. ΠϯλʔϑΣΠε C++(C) Go ͓·͡ͳ͍Ͱ͸ͳ͘ ҙຯ͕͋Δ
19. main() C++(C) Go ϝϞϦ΍ϙΠϯλΛཧղ͠ͳ͍ͱμϝ ໊લۭؒͱ͔ . or -> ͳͷ͔ͱ͔ཧղ͠ͳ͍ͱμϝ
20. ࣮ߦ C++(C) Go ϙΠϯλͷࢀর͕Χ΢ϯτΞοϓ είʔϓΛൈ͚ΔͱσετϥΫλΛ࣮ߦ int64ͱFloatͰ͸ܭࢉ݁Ռ͕ҟͳΔ
21. ฒߦɺνϟϯωϧ CPUͱ͔ߟ͑ͣʹ͍͍ײ͡ʹฒߦॲཧͯ͘͠Ε·͢ ফඅϝϞϦ΋͘͢ͳ͍Α
22. C++(C) Go go Ͱ࣮ߦ join Ͱ͢ΑͶʔ SleepͳΓ ϧʔϓ͠ͳ ͍ͱɾɾɾ mutexͱ͔͍ΔΑͶ ίʔυࣗମ͸ Ͳͬͪ΋Ͳͬͪ
23. ࣮ߦ C++(C) Go ՈͷMac mini Ͱ͸ޮՌ͕͋ͬͨ Macbook Pro Ͱ͸ٯʹ஗͍ɾɾɾ thread ࢖͏ͱ଎͍Ͷ ฒߦॲཧʹ ͢ΔͱͲͬͪ΋ fib(30)͕ ࠷ॳʹ׬ྃ
24. ิ଍ C++(C) Go out/Default/obj/run_thread.ninja ʹ flags_cc = -std=c++11 ͕ͳ͍ͱμϝ mainؔ਺ଆͷfor ಺ͷ close(ch) , beak ΛίϝϯτΞ΢τ ͢Δͱ deadlock ͯ͠ϓΪϟΕΔΑ (mainؔ਺୭΋௨஌͠ͳ͘ͳͨͷͰ)
25. ґଘؔ܎ ࣗ෼Ͱղܾ C,C++ͱ͔(άάͬͨΒclibͱ͔ग़͖ͯͨ…) πʔϧͰղܾ java (maven, gradle, sbt) ݴޠσϑΝΫτ؅ཧπʔϧ npm, pip, gem, cpan (JS, python, ruby,perl) ͋ΔΑ Go (ศརͱ͸ݴͬͯͳ͍)
 $ go get <package name>
26. ߟ࡯ʢࢲͷ৔߹ʣ ٕज़తʹઑͬͨཁ͕݅ͳ͚Ε͹ Go Ͱ͍͍ͱࢥ͏ Ψν੎͸޷ҙతͰͳ͍ʢΑ͏ʹݟ͑Δʣ ϓϩάϥϜݴޠΛ͖ͪΜͱධՁͨ͠Γɺཧղͨ͠Γ͍ͨ͠ਓ͸ɺ
 ผ్͓ษڧ͕ඞཁ ৽ਓݚमͱ͔͜ΕͰ͍͍͔΋ ʢJavaΑΓ͸ɾɾɾʣ CʴʴΛٱ͠ͿΓʹॻ͘ͱؾ͍͍࣋ͪ
27. ߟ࡯ʢωοτͷ৔߹ʣ
28. ߟ࡯ʢωοτͷ৔߹ʣ
29. ߟ࡯ʢωοτͷ৔߹ʣ
30. ࢀߟ Go Features and Case Studies
 https://speakerdeck.com/ianlewis/go-features-and-case-studies Google’s Go Language
 http://functionspace.com/topic/2961/Google--039;s-Go-Language Goݴޠ͕μϝͳཧ༝
 http://postd.cc/why-go-is-not-good/ Goίʔυͷॻ͖ํ
 http://golang-jp.org/doc/code.html
31. ࢀߟ Go Docs
 http://golang-jp.org/doc/ Go FAQ
 https://golang.org/doc/faq Less is exponentially more (ωοτͷݪจ)
 http://commandcenter.blogspot.jp/2012/06/less-is-exponentially-more.html Go : ੝Γ্͕Γײ (hype) Λ࣮ྗʹ͢Δ͜ͱ͕ॏཁ ʢҾ༻ݩʣ
 http://wazanova.jp/post/63408341634/go-hype
32. Go Go Go ࠓͰ͢ʂʂ ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠