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【Go言語】クロージャ
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Tomoki Ota
October 04, 2024
Programming
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【Go言語】クロージャ
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Transcript
Tomoki Ota ʲGoݴޠʳΫϩʔδϟ࣮ફฤ
Ϋϩʔδϟ࣮ફฤ GoͷΠςϨʔλ ΞδΣϯμ 2
Ϋϩʔδϟͱʁ
Ϋϩʔδϟͱʁ 4 •ڥΛΩϟϓνϟͰ͖Δແ໊ؔ
ϝϦοτ 5 • άϩʔόϧมΛ༻͍Δඞཁ͕ͳ͘ͳΔ • ؔͷείʔϓΛ੍ݶͰ͖Δ
Ϋϩʔδϟͷ߹ 6
ؔͷ߹ 7
Ϋϩʔδϟ࣮ફฤ
9 ࠨͷίʔυͷ ʁ
10 1 ॏ͍ॲཧcalcTrainingRepsͷݺͼग़͠෦͕ ෳՕॴ͋ΔͷͰɺมߋ͕໘
11 2 ॏ͍ॲཧΛෳճ࣮ߦ͠ͳ͚ΕͳΒͳ͍ Մೳੑ͕͋Δɻ
12 ؔͰϦϑΝΫλ
13 ؔͰϦϑΝΫλ ͜Εͩͱ2͕ղܾ͍ͯ͠ͳ͍ɻ ͞ΒʹɺrepsΛ༻͠ͳ͍ͱ͖ ॏ͍ॲཧΛݺͼͩ͞ΕΔͱ͍͏৽ͨͳ͕ Ճ͞ΕΔɻ
14 ΫϩʔδϟͰϦϑΝΫλ ΫϩʔδϟΛ͏͜ͱͰɺreps͕ඞཁͳ͚࣌ͩ ίʔυΛ࣮ߦ͢Δ
ߴ֊ؔ
ߴ֊ؔͱʁ 16 ؔΛҾʹͱͬͨΓɺؔΛΓͱͨ͠Γ͢Δؔ
ϝϦοτ 17 ϓϩάϥϜͷॊೈੑ ίʔυͷ؆ܿੑ ࠶ར༻ੑ ϝϯςφϯεੑ
Goʹ͓͚Δߴ֊ؔ 18
ίʔϧόοΫ 19
ΧϦʔԽ
ΧϦʔԽͱʁ 21 f(a, b, c)Λf(a)(b)(c)ͷΑ͏ʹҾΛ1ͭʹ͢Δ
22 ΧϦʔԽ͍ͯ͠ͳ͍ྫ ΧϦʔԽΛͬͯϦϑΝΫλͨ͠ྫ
෦ద༻
෦ద༻ 24 ΧϦʔԽ͞ΕͨؔɺҙͷҾΛݻఆͨ͠ผͷؔΛ࡞͢Δ͜ͱ͕Ͱ͖Δ
25 ෦ద༻
CPS
CPSͱʁ 27 continuation-passing styleɺܧଓ͠ελΠϧͱ͍͏ɻ ؔͷୈ1Ҿʹɺޙʹଓ͘ॲཧ(ܭଌ)Λ͢ϓϩάϥϛϯάελΠϧ CJavaͰɺޙʹଓ͘ॲཧΛηϛίϩϯͱվߦͷޙʹଓࣜ͘
CPSͷ݅ 28 •First-class Function(ୈҰڃؔ) •Tail-Call optimization(ඌݺͼग़͠࠷దԽ) GoͷίϯύΠϥରԠ͍ͯ͠ͳ͍
CPSͷ݅ 29
CPSͷྫ 30
CPSͷ݅ 31
࠶ؼͱඌ࠶ؼ 32
࠶ؼͱඌ࠶ؼ 33
࠶ؼͱඌ࠶ؼ 34
δΣωϨʔλ
δΣωϨʔλͱ 36 ΠςϨʔλΛ؆୯ʹ࡞Δ͜ͱ͕Ͱ͖ΔɻΠςϨʔλΛฦؔ͢ δΣωϨʔλؔͱ͍͏ɻ ·ͨɺδΣωϨʔλؔͰ࡞͞ΕͨΠςϨʔλͷ͜ͱΛ δΣωϨʔλͱݺͿ͜ͱ͋Δɻ
GoͷΠςϨʔλ
range over int
range over int 39 Go1.22Ҏ߱ Go1.22Ҏલ
range over func
range over func 41 GoͷΠςϨʔλͷσϑΝΫτελϯμʔυ
v1.23ҎલͷΠςϨʔλ 42 database/sql.Rows archive/tar.Reader.Next
range over func 43 ҎԼͷγάωνϟͷؔΛrangeͰ෮ॲཧͰ͖Δɻ
range over func 44
range over func 45 rangeͰyieldΛ༻͢Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨɻ
GoͷΠςϨʔλ 46 • PushελΠϧ : 1ͭͣͭσʔλΛ͢ • PullελΠϧ : 1ͭͣͭσʔλΛड͚औΔ
func(func()bool) 47
48 func(func(V)bool)
func(func(K, V)bool) 49
iterύοέʔδ
iterύοέʔδ 51 https://github.com/golang/go/tree/go1.23.0/src/iter 1.23ͰՃ͞Εͨ