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| import Foundation | |
| // Ref: https://stackoverflow.com/questions/24058906/printing-a-variable-memory-address-in-swift | |
| // Author: nyg (profile: https://stackoverflow.com/users/5536516/nyg) | |
| struct MemoryAddress<T>: CustomStringConvertible { | |
| let intValue: Int | |
| var description: String { | |
| let length = 2 + 2 * MemoryLayout<UnsafeRawPointer>.size | |
| return String(format: "%0\(length)p", intValue) | |
| } | |
| // for structures | |
| init(of structPointer: UnsafePointer<T>) { | |
| intValue = Int(bitPattern: structPointer) | |
| } | |
| } | |
| extension MemoryAddress where T: AnyObject { | |
| // for classes | |
| init(of classInstance: T) { | |
| intValue = unsafeBitCast(classInstance, to: Int.self) | |
| // or Int(bitPattern: Unmanaged<T>.passUnretained(classInstance).toOpaque()) | |
| } | |
| } | |
| // Below is testing code | |
| class MyClass { | |
| let foo = 42 | |
| let tmp = 55 | |
| } | |
| struct MyStruct { let foo = 3 } // using empty struct gives weird results (see comments) | |
| var classInstance = MyClass() | |
| let referencePointerOfClassInstance = UnsafeMutablePointer<MyClass>(&classInstance) | |
| let t1ClassInstance = classInstance | |
| let t2ClassInstance = MyClass() | |
| print("classInstance address: \(MemoryAddress(of: classInstance))") | |
| print("t1ClassInstance address: \(MemoryAddress(of: t1ClassInstance))") | |
| print("t2ClassInstance address: \(MemoryAddress(of: t2ClassInstance))") | |
| var structInstance = MyStruct() | |
| let referencePointerOfStructInstance = UnsafePointer<MyStruct>(&structInstance) | |
| var t1StructInstance = structInstance | |
| var t2StructInstance = MyStruct() | |
| print("structInstance address: \(MemoryAddress(of: &structInstance))") | |
| print("t1StructInstance address: \(MemoryAddress(of: &t1StructInstance))") | |
| print("t2StructInstance address: \(MemoryAddress(of: &t2StructInstance))") |
Below using lldb commands to check memory address & value:
