Head First Golang Image Package

by Seiji Takahashi

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Head First Golang image package @__timakin__ golang.tokyo#19

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SEIJI TAKAHASHI

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ΞδΣϯμ *NBHFύοέʔδͷ঺հ ࣮ྫͰֶͿ*NBHFύοέʔδ ը૾ͷ߹੒ɾՃ޻ ը૾ͱจࣈͷ߹੒

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QBDLBHFl*NBHFz w %ը૾Λѻ͏ͨΊͷύοέʔδ w +1( 1/( (*'ʹରԠ w Ͱ͖Δ͜ͱ w ৭৘ใऔಘ w 1PJOU 3FDUBOHMFͷૢ࡞ w ݁߹ॲཧʢESBXʣ w ϑΥʔϚοτͷσίʔυ

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ྫʣ੺ͷ࢛֯ܗΛඳը

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ϞβΠΫ γϟʔϓௐ੔ ໌Δ͞ௐ੔ ͳͲɺେମ΍Γ͍ͨ͜ͱ͸Ͱ͖Δ͕ ίʔυྔ͕ଟ͗͢ΔͷͰׂѪ

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ͱ͍͏͔

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࢛֯΍ؙͷඳըͱ͔ Ṗͷ৭ௐ੔ͱ͔

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ͦΜͳ͜ͱͨͯ͘͠ ͜͜ʹ͖ͯ·͔͢ʁ

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࣮ફͯ͠Έ·͠ΐ͏ʂ

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ը૾ͷ߹੒ɾՃ޻

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ͱ͜ΖͰօ͞Μ

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!EFFFFU͞Μɻ ࠃ಺ͰϚΠΫϩαʔϏεͱ ͍͑͹͜ͷํɻ

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Ͱ͕͢ɺ

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ˌEFFFFU෩

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खʹ࣋ͬͨΦϒδΣΫτʢʣΛ தԝʹਾ͑ͳ͕Β ࣸਅΛࡱΔࡱӨٕ๏ʢʁʣ

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खʹ࣋ͬͨΦϒδΣΫτʢʣΛ தԝʹਾ͑ͳ͕Β ࣸਅΛࡱΔࡱӨٕ๏ʢʁʣ

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ͦΜͳʹखʹ͓͠ΌΕͳ Λ࣋ͭػձ͸ͳ͍

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୭Ͱ΋ख๏Λ࠶ݱͰ͖Δͱศར

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஫ɿW

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΍Γ͍ͨ͜ͱ w Ͱ͍͍ײ͡ͷงғؾΛग़͍ͨ͠ w ͦΕΛखʹ࣋ͬͨঢ়ଶͰதԝʹఴ͍͑ͨ w ʹϑΥʔΧε͍ͯ͠Δ෩ʹ͍ͨ͠

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ඞཁͳ΋ͷ w खɺɺഎܠ

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ΦϦδφϧ

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ඞཁͳͱ͜Ζ

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෼཭

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ద౰ͳഎܠΛ୳͢

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ݟ͚ͭΔ

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࣮૷ w ྆ը૾ͷಡΈࠐΈ w എܠʹద౓ͳ΅͔͠ΛೖΕΔ w खͷը૾Λਃ͠༁ఔ౓ʹαΠζௐ੔͢Δ w खट͕ࠨԼʹདྷΔΑ͏ʹͬ͢ͱ߹੒ w ϑΝΠϧग़ྗ

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HJUIVCDPNEJTJOUFHSBUJPOJNBHJOH w JNBHFύοέʔδͷϥούʔ w ΅͔͠΍໌౓ௐ੔͕΋ͷ͍͢͝؆୯ʹͰ͖Δ

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ਃ͠༁ఔ౓ͷαΠζௐ੔

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ͬ͢ͱࠨԼʹ߹੒

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ग़ྗʜ

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ը૾ͷ߹੒ɾՃ޻ w HJUIVCDPNEJTJOUFHSBUJPOJNBHJOHΛ࢖͏ ͱ͍ͩͿָʹ΅͔͠ͳͲΛೖΕΒΕΔ w ߹੒ͷࡍ͸ج४఺͕ࠨ্Ͱ͋Δ͜ͱʹ஫ҙ w ਖ਼௚༧૝֎ͷͦΕͬΆ͞ʹͳͬͨ

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ˠਅ໘໨ͳ࿩

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αʔϏεӡ༻தɺ Ϛʔέࢪࡦͱͯ͠0(1ը૾Λ ࡞੒͢Δ͜ͱ͕͋ΔͷͰ͸ʁ

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ը૾ͱจࣈͷ߹੒

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΍Γ͍ͨ͜ͱ w 0(1എܠը૾ʹจࣈΛ߹੒͢Δ w ೚ҙͷจࣈྻΛ೚ҙͷϑΥϯτͰɺ  ద੾ͳҐஔʹදࣔ͢Δ

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ૉࡐ

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࣮૷ w ೚ҙͷϑΥϯτΛಡΈࠐΉ w ͦͷϑΥϯτͰςΩετΛ೚ҙͷҐஔʹඳը w എܠͱॏͶ߹Θͤͯॻ͖ग़͠

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HJUIVCDPNHPMBOHGSFFUZQFUSVFUZQF w ೚ҙͷϑΥϯτͰςΩετΛ೚ҙͷҐஔʹग़͢ʹ͸ɺ ௨ৗͷը૾Ճ޻Ͱ͸ෆՄɻ w GSFFUZQFύοέʔδΛ࢖͏ɻ

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ϑΥϯτͷಡΈࠐΈ

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എܠΛॻ͖ग़͓ͯ͘͠

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GPOU%SBXFSΛ࢖ͬͨςΩετඳը

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ग़ྗʜ

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ग़ྗʜ

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ը૾ͱจࣈͷ߹੒ w ϑΥϯτ΍Ґஔௐ੔Λॊೈʹ͍ͨ͠৔߹ɺ  GSFFUZQFύοέʔδͱGPOU%SBXMFSͷ߹Θٕͤ Ͱ͍͚Δ w ը૾ͷͲͷҐஔʹදࣔ͢Δ͔ɺจࣈͷંΓฦ͠͸  Ͳ͏͢Δ͔͸దٓௐ੔ͷඞཁ͋Γ

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·ͱΊ JNBHFͰ৭ɾେ͖͞ͳͲ͕؆୯ʹऔಘͰ͖Δ ϥούʔΛ࢖͑͹Ճ޻΋؆୯ ߹੒ͷ৔߹͸࠲ඪɾॻ͖ग़͠ॲཧͷ࣮૷͕ར༻έʔεʹԠ͡ ͯมΘͬͯ͘ΔͷͰ஫ҙͷඞཁ͋Γ

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͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ