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@Satachito(Satoru Ogura)

Swift の Array やら ArraySlice やらポインタの変換まとめ

Last updated at Posted at 2018-11-26

Swift の以下の型の間で、直接相互に変換できるものを網羅してみる。

UnsafeRawPointer
UnsafeMutableRawPointer

UnsafePointer< Int >
UnsafeMutablePointer< Int >

UnsafeRawBufferPointer
UnsafeMutableRawBufferPointer

UnsafeBufferPointer< Int >
UnsafeMutableBufferPointer< Int >

Array< Int >
ArraySlice< Int >

OpaquePointer
ポインタ名 変更 型 サイズ
UnsafeRawPointer
UnsafeMutableRawPointer ○
UnsafePointer< Int > ○
UnsafeMutablePointer< Int > ○ ○
UnsafeRawBufferPointer ○
UnsafeMutableRawBufferPointer ○ ○
UnsafeBufferPointer< Int > ○ ○
UnsafeMutableBufferPointer< Int > ○ ○ ○
let Array< Int > ○ ○
var Array< Int > ○ ○ ○
let ArraySlice< Int > ○ ○
var ArraySlice< Int > ○ ○ ○
OpaquePointer
  • 変更できないものからできるものには変換するには、mutating:を使う。
  • 型のないものからあるものには変換するには、assumingMemoryBound( to: Int.self )を使う。
  • サイズのないものからあるものには変換できない。
  • withUnsafeRawBufferPointer という名前のメソッドはない。withUnsafeBytesを使う。
  • withUnsafeMutableRawBufferPointer という名前のメソッドはない。withUnsafeMutableBytesを使う。

var Array< Int > から


var	w	: Array< Int >						= [ 1, 2, 3 ]

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w )

let	_	: UnsafePointer< Int >				= UnsafePointer( w )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w )

let	_	: UnsafeRawBufferPointer			= w.withUnsafeBytes { $0 }
let	_	: UnsafeMutableRawBufferPointer		= w.withUnsafeMutableBytes { $0 }

let	_	: UnsafeBufferPointer< Int >		= w.withUnsafeBufferPointer { $0 }
let	_	: UnsafeMutableBufferPointer< Int >	= w.withUnsafeMutableBufferPointer { $0 }

let	_	: ArraySlice< Int >					= ArraySlice( w )
	
let	_	: OpaquePointer						= OpaquePointer( w )

let Array< Int > から


let	w	: Array< Int >						= [ 1, 2, 3 ]

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w )

let	_	: UnsafePointer< Int >				= UnsafePointer( w )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w )

let	_	: UnsafeRawBufferPointer			= w.withUnsafeBytes { $0 }
let	_	: UnsafeMutableRawBufferPointer		= UnsafeMutableRawBufferPointer( mutating: w.withUnsafeBytes { $0 } )

let	_	: UnsafeBufferPointer< Int >		= w.withUnsafeBufferPointer { $0 }
let	_	: UnsafeMutableBufferPointer< Int >	= UnsafeMutableBufferPointer( mutating: w.withUnsafeBufferPointer { $0 } )

let	_	: ArraySlice< Int >					= ArraySlice( w )

let	_	: OpaquePointer						= OpaquePointer( w )

var ArraySlice< Int > から


var	w	: ArraySlice< Int >					= ArraySlice( [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= w.withUnsafeBytes { $0.baseAddress! }
let	_	: UnsafeMutableRawPointer			= w.withUnsafeMutableBytes { $0.baseAddress! }

let	_	: UnsafePointer< Int >				= w.withUnsafeBufferPointer { $0.baseAddress! }
let	_	: UnsafeMutablePointer< Int >		= w.withUnsafeMutableBufferPointer { $0.baseAddress! }

let	_	: UnsafeRawBufferPointer			= w.withUnsafeBytes { $0 }
let	_	: UnsafeMutableRawBufferPointer		= w.withUnsafeMutableBytes { $0 }

let	_	: UnsafeBufferPointer< Int >		= w.withUnsafeBufferPointer { $0 }
let	_	: UnsafeMutableBufferPointer< Int >	= w.withUnsafeMutableBufferPointer { $0 }

let	_	: Array< Int >						= Array( w )
	
let	_	: OpaquePointer						= OpaquePointer( w.withUnsafeBufferPointer { $0.baseAddress! } )

let ArraySlice< Int > から


let	w	: ArraySlice< Int >					= ArraySlice( [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= w.withUnsafeBytes { $0.baseAddress! }
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w.withUnsafeBytes { $0.baseAddress! } )

let	_	: UnsafePointer< Int >				= w.withUnsafeBufferPointer { $0.baseAddress! }
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w.withUnsafeBufferPointer { $0.baseAddress! } )

let	_	: UnsafeRawBufferPointer			= w.withUnsafeBytes { $0 }
let	_	: UnsafeMutableRawBufferPointer		= UnsafeMutableRawBufferPointer( mutating: w.withUnsafeBytes { $0 } )

let	_	: UnsafeBufferPointer< Int >		= w.withUnsafeBufferPointer { $0 }
let	_	: UnsafeMutableBufferPointer< Int >	= UnsafeMutableBufferPointer( mutating: w.withUnsafeBufferPointer { $0 } )

let	_	: Array< Int >						= Array( w )

let	_	: OpaquePointer						= OpaquePointer( w.withUnsafeBufferPointer { $0.baseAddress! } )

UnsafeRawPointer から


let	w	: UnsafeRawPointer					= UnsafeRawPointer( [ 1, 2, 3 ] )

let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w )

let	_	: UnsafePointer< Int >				= w.assumingMemoryBound( to: Int.self )
Int.self )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w.assumingMemoryBound( to: Int.self ) )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutableRawPointer( mutating: w ).assumingMemoryBound( to:  Int.self ) )   // こんなのも可能

let	_	: OpaquePointer						= OpaquePointer( w )

UnsafeMutableRawPointer から


let	w	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )

let	_	: UnsafePointer< Int >				= UnsafePointer( w.assumingMemoryBound( to: Int.self ) )
let	_	: UnsafeMutablePointer< Int >		= w.assumingMemoryBound( to: Int.self )
	
let	_	: OpaquePointer						= OpaquePointer( w )

UnsafePointer< Int > から


let	w	: UnsafePointer< Int >				= UnsafePointer( [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w )

let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w )
	
let	_	: OpaquePointer						= OpaquePointer( w )

UnsafeMutablePointer< Int > から


let	w	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( w )

let	_	: UnsafePointer< Int >				= UnsafePointer( w )
	
let	_	: OpaquePointer						= OpaquePointer( w )

UnsafeRawBufferPointer から


let	w	: UnsafeRawBufferPointer			= [ 1, 2, 3 ].withUnsafeBytes { $0 }

let	_	: UnsafeRawPointer					= w.baseAddress!
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w.baseAddress! )

let	_	: UnsafePointer< Int >				= w.baseAddress!.assumingMemoryBound( to: Int.self )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w.baseAddress!.assumingMemoryBound( to: Int.self ) )

let	_	: UnsafeMutableRawBufferPointer		= UnsafeMutableRawBufferPointer( mutating: w )

let	_	: OpaquePointer						= OpaquePointer( w.baseAddress! )

UnsafeMutableRawBufferPointer から


var	wArray = [ 1, 2, 3 ]
let	w	: UnsafeMutableRawBufferPointer		= wArray.withUnsafeMutableBytes { $0 }

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w.baseAddress! )
let	_	: UnsafeMutableRawPointer			= w.baseAddress!

let	_	: UnsafePointer< Int >				= UnsafePointer( w.baseAddress!.assumingMemoryBound( to: Int.self ) )
let	_	: UnsafeMutablePointer< Int >		= w.baseAddress!.assumingMemoryBound( to: Int.self )

let	_	: UnsafeRawBufferPointer			= UnsafeRawBufferPointer( w )

let	_	: OpaquePointer						= OpaquePointer( w.baseAddress! )

UnsafeBufferPointer< Int > から


let	w	: UnsafeBufferPointer				= [ 1, 2, 3 ].withUnsafeBufferPointer { $0 }

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w.baseAddress! )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( mutating: w.baseAddress! )

let	_	: UnsafePointer< Int >				= UnsafePointer( w.baseAddress! )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( mutating: w.baseAddress! )

let	_	: UnsafeRawBufferPointer			= UnsafeRawBufferPointer( w )
let	_	: UnsafeMutableRawBufferPointer		= UnsafeMutableRawBufferPointer( mutating: UnsafeRawBufferPointer( w ) )

let	_	: UnsafeMutableBufferPointer< Int >	= UnsafeMutableBufferPointer( mutating: w )

let	_	: Array< Int >						= Array( w )
let	_	: ArraySlice< Int >					= ArraySlice( w )

let	_	: OpaquePointer						= OpaquePointer( w.baseAddress! )

UnsafeMutableBufferPointer< Int > から


var	wArray = [ 1, 2, 3 ]
let	w	: UnsafeMutableBufferPointer 		= wArray.withUnsafeMutableBufferPointer { $0 }

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w.baseAddress! )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( w.baseAddress! )

let	_	: UnsafePointer< Int >				= UnsafePointer( w.baseAddress! )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( w.baseAddress! )

let	_	: UnsafeRawBufferPointer			= UnsafeRawBufferPointer( w )
let	_	: UnsafeMutableRawBufferPointer		= UnsafeMutableRawBufferPointer( w )

let	_	: UnsafeBufferPointer< Int >		= UnsafeBufferPointer( w )

let	_	: Array< Int >						= Array( w )
let	_	: ArraySlice< Int >					= ArraySlice( w )

let	_	: OpaquePointer						= OpaquePointer( w.baseAddress! )

OpaquePointer から


let	w	: OpaquePointer						= OpaquePointer( [ 1, 2, 3 ] )

let	_	: UnsafeRawPointer					= UnsafeRawPointer( w )
let	_	: UnsafeMutableRawPointer			= UnsafeMutableRawPointer( w )

let	_	: UnsafePointer< Int >				= UnsafePointer( w )
let	_	: UnsafeMutablePointer< Int >		= UnsafeMutablePointer( w )
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