Created
December 14, 2018 17:28
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Printing <type: address> of literally any instance (objective-c and swift)
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struct Pointer<T: Any>: CustomStringConvertible { | |
let address: UInt | |
let description: String | |
let debugDescription: String | |
init(to valueTypePtr: UnsafePointer<T>) { | |
address = UInt(bitPattern: valueTypePtr) | |
let pointee = valueTypePtr.pointee | |
description = "<\(type(of: pointee)): 0x\(address.hexString)>" | |
debugDescription = "\(description) == \( String(describing: pointee) )" | |
} | |
} | |
//////////////////////// | |
extension Pointer where T: AnyObject { | |
init(to object: T) { | |
address = UInt(bitPattern: ObjectIdentifier(object)) | |
description = "<\(type(of: object)): 0x\(address.hexString)>" | |
debugDescription = String(describing: object) | |
} | |
} | |
////////////////////////////////////////////////////////////////////////////////////////////////////////////// | |
extension FixedWidthInteger { | |
var hexString: String { | |
return String(self, radix: 16, uppercase: false) | |
} | |
} | |
////////////////////////////////////////////////////////////////////////////////////////////////////////////// | |
func testThis(){ | |
var aa = CGSize.zero | |
print(Pointer(to: &aa)) // <CGSize: 0x7ffeec957c78> | |
let bb = UILabel(frame: .zero) | |
print(Pointer(to: bb)) // <UILabel: 0x7f90e9504330> | |
var cc: CGSize? = nil | |
print(Pointer(to: &cc)) // <Optional<CGSize>: 0x7ffeec957c60> | |
var dd: NSObject? = nil | |
print(Pointer(to: &dd)) // <Optional<NSObject>: 0x7ffeec957cb8> | |
var ee1 = UIStatusBarStyle.lightContent | |
print(Pointer(to: &ee1)) // <UIStatusBarStyle: 0x7ffeecea6bd0> | |
var ee2 = UIStatusBarStyle.lightContent | |
print(Pointer(to: &ee2)) // <UIStatusBarStyle: 0x7ffeecea6bd8> | |
var ff = 123 | |
print(Pointer(to: &ff)) // <Int: 0x7ffee27b3c58> | |
var gg = "hello" | |
print(Pointer(to: &gg)) // <String: 0x7ffee86adc28> | |
var hh: (Int) -> String? = { return "\($0)" } | |
print(Pointer(to: &hh)) // <(Int) -> Optional<String>: 0x7ffee86adba8> | |
} | |
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