Pointer と向き合う / Facing the Pointer

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Copyright © Bitkey Inc. All rights reserved. ௡ౡ խढ़ Masatoshi Tsushima 2004 ιϑτ΢ΣΞ։ൃͱͷग़ձ͍ WebαΠτ΍ܞଳΞϓϦΛ࡞ͬͯ༡ΜͰ͍·ͨ͠ 2018ळ Bitkeyʹࢀը ౰ॳ͸bitkey platformͷ։ൃΛ୲౰ ओʹGoͰαʔόαΠυΛ։ൃ 2019ळ ϑΝʔϜ΢ΣΞνʔϜΛ্ཱͪ͛ bitlock LITEͷϑΝʔϜ΢ΣΞΛ಺੡Խ ݱࡏʹଓ͘։ൃελΠϧΛߏங 2020Ն ୈೋੈ୅ϩοΫσόΠεͷ։ൃ ಺੡Λલఏͱͨ͠ϑΝʔϜ΢ΣΞ։ൃ 2021य़ϦϦʔε 2022Ն Individual contributor (?) Android/iOS/FlutterɺσόΠεQA༻ΞϓϦɺࣾ಺ ࢓༷ͷඪ४ԽɺMakefile৬ਓɺCI͓͡͞Μ

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Copyright © Bitkey Inc. All rights reserved. Data ͔Β Int ʹ͍ͨ͠ ݕࡧ͢ΔͱΑ͘ग़ͯ͘Δ΍ͭ import Foundation let data = Data([1, 2, 3, 4]) let x = data.withUnsafeBytes { $0.load(as: UInt16.self) } print(x) // Output: 513

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Copyright © Bitkey Inc. All rights reserved. Data ͔Β Int ʹ͍ͨ͠ load ͷ୅ΘΓʹ OpaquePointer Λܦ༝ͤͯ͞Έͨ import Foundation let data = Data([1, 2, 3, 4]) let x = data.withUnsafeBytes { UnsafePointer(OpaquePointer($0.baseAddress!)).pointee } print(x) // Output: 513 खݩͰ͸ -O -emit-assembly Ͱಉ݁͡Ռ

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Copyright © Bitkey Inc. All rights reserved. ͪͳΈʹ: Swift ͷΤϯσΟΞϯͷૢ࡞ λʔήοτͱҟͳΔͳΒٯॱʹ͢Δ print(x) // Apple Silicon ͸ 513 print(x.bigEndian) // 258 print(x.littleEndian) // 513 print(x.bigEndian.bigEndian) // 513 print(x.littleEndian.littleEndian) // 513

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Copyright © Bitkey Inc. All rights reserved. ༷ʑͳܕ ● UnsafePointer ● UnsafeMutablePointer ● UnsafeRawPointer ● UnsafeMutableRawPointer ● UnsafeBufferPointer ● UnsafeMutableBufferPointer ● UnsafeRawBufferPointer ● UnsafeMutableRawBufferPointer Mutable ॻ͖׵͑Մೳ Buffer ௕͞ (count) ෇͖ Raw ૯শܕ () ແ͠

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Copyright © Bitkey Inc. All rights reserved. Unsafe ͱ͸ʁ ● UnsafePointer ● UnsafeMutablePointer ● UnsafeRawPointer ● UnsafeMutableRawPointer ● UnsafeBufferPointer ● UnsafeMutableBufferPointer ● UnsafeRawBufferPointer ● UnsafeMutableRawBufferPointer

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Copyright © Bitkey Inc. All rights reserved. ະ֬อ ൣғ֎ʹΞΫηε͢Δ import Foundation let data = Data([1, 2, 3, 4]) let x = data.withUnsafeBytes { let op = OpaquePointer($0.baseAddress!.advanced(by: 10)) return UnsafePointer(op).pointee } print(x) load ͷ count νΣοΫΛආ͚Δͱਖ਼ৗऴྃ͢Δ

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Copyright © Bitkey Inc. All rights reserved. ·ͱΊ: Swift ͷ Pointer ● Data ͱ Int ͷ૬ޓม׵͕୅දྫ ● Ͳͷ͋ͨΓ͕ Unsafe ʁ ○ ະ֬อ: ࢦࣔ͢͠ઌ͕֬อ͞Ε͍ͯͳ͍͔΋ ○ ະॳظԽ: ॳظԽ͞Ε͍ͯͳ͍͔΋ ○ ະ։์: ։์͞Εͳ͍͔΋ ● ਖ਼͘͠࢖Θͳ͍ͱͲ͏ͳΔʁ ○ ίϯύΠϧ͸௨Δ ○ Ϋϥογϡͨ͠Γ͠ͳ͔ͬͨΓϝϞϦΛ৯͍ͭͿͨ͠Γ͢Δ

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Copyright © Bitkey Inc. All rights reserved. ࢀߟจݙ ● Safely manage pointers in Swift - WWWDC20 ● [Swift] IntͱDataͷ૬ޓม׵ #Swift - Qiita ● ʲSwift5ʳDataΛInt΍DoubleͳͲͱ૬ޓม׵͢Δํ๏ – Ώ͖ͬͿΖ͙ ● ios - how to convert Data to Int in swift - Stack Overflow ● ૉ੖Β͍͠SwiftͷϙΠϯλܕͷղઆ #Swift - Qiita

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