macOSだとpointerValueが違う。
$ xcrun --toolchain org.swift.5020181225a swift swift_oss_helper command enabled. Welcome to Apple Swift version 5.0-dev (LLVM c351ac7354, Clang aadec4ff83, Swift 5cfc2e7ba9). Type :help for assistance. 1> import Foundation 2. let data = "test".data(using: .utf8)! 3. dump(data) 4. data.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) in 5. dump(bytes) 6. } ▿ 4 bytes - count: 4 ▿ pointer: 0x00007ffeefbff818 - pointerValue: 140732920756248 ▿ bytes: 4 elements - 116 - 101 - 115 - 116 ▿ 0x00007ffeefbffb30 - pointerValue: 140732920757040
(edited)